F-22 / F-35 5th Generation jets | News & Discussions.

[randomradio]

No it is not my assumption, they did have an example in the paper that you cited, and in that example the gain of the photoelectric system is lower than normal system

Alright radio, you cant just keep making things up as you feel like it, It is very childlike and exposed your lack of knowledge , there is no such thing as "this system will have 20 times current AESA resolution" , because the resolution of any radar has alot to do with its aperture size and operating frequency, there is no such thing as a uniform AESA or PESA radar resolution. And just because a system is AESA or PESA doesn't mean it will have higher resolution than parabolic antenna.


Higher beam steering how? when the limit for current beam steering is the speed of the pulse? (aka speed of light)


Dont confuse between the feed and the antenna.


No offense but all the evidence to the contrary



Just because you said the word."quantum mechanics " doesn't mean you can by past all physical barrier. Do you actually understand how they work at all?



No it isn't. The common theme for propaganda pieces is that they all have a bunch of scientific sounding words thrown together but lack basic understanding of how stuff work


and it didn't talk about "400 km facial recognition


Look at the place where they have the" ", and the place where they dont, the 400 km facial recognition is totally a bunch of BS made up by the journalist


As long as the beam is electromagnetic wave (which optical frequency included) then they will obey normal physics.

My uni degree was in physics. If you think i didn't understand quantum physics then you are badly mistaken


It is not in any way related to each other. To see through the fuselage you need your beam to penetrate metal, to see object at 400 km you need very high power. To do facial recognition you need narrow beam width ( extremely high frequency or aperture)


I dont care, this is the same as the nonsense about plasma stealth


Yes he will, i bet, because of how ridiculous it is



You would be surprised at how much physics a radar engineer know

You should have just waited to read my next post before replying to the previous one.

The Phodir system was based on an experimental system. The 400Km thing is from KRET officials. Etc etc etc. All posted in $524.

 

[500]

Final flight tests for F-35C:

 

[Olaf One-Brow]

Gun pod footage.

 

[That_engineer_guy]

You should have just waited to read my next post before replying to the previous one.

The Phodir system was based on an experimental system. The 400Km thing is from KRET officials. Etc etc etc. All posted in $524.

I did read all your post radio, and they all lack the scientific based.Like i said at the first place, it nothing more than a BS piece of propaganda, may be it can fool people that doesn't understand physics but i doubt that even uni student can be fooled by that crap

 

[randomradio]

I did read all your post radio, and they all lack the scientific based.Like i said at the first place, it nothing more than a BS piece of propaganda, may be it can fool people that doesn't understand physics but i doubt that even uni student can be fooled by that crap

Propaganda, eh? Even though this stuff has patents?

This one's from Lockheed Martin.

http://www.google.co.in/patents/US7375802

Classical radar systems are typically limited to microwave frequencies due to absorption, leaving the far-infrared frequencies largely unused. Entangling photons into a multiphoton changes their resonance behavior and “detunes” them with respect to the absorption bands. Entangled radar waves can combine one or more particles with a relatively high frequency for resolution with one or more particles at a lower frequency for more effective propagation through various absorption bands in the atmosphere or other medium. The frequencies of the waves for propagation and resolution can be separately controlled, allowing the quantum radar system to use signals for resolution at previously unused frequencies. Thus, quantum radar is capable of providing information about targets that cannot be provided using classical radar systems.

The ability to propagate radar signals at frequencies that are independent of the resolution frequency may allow quantum radar system 100 to attain near zero attenuation rates in the atmosphere, and greatly diminished attenuation rates in other media including foliage, building materials, earthen layers, etc. Quantum radar system 100, thus, can be adapted to visualize useful target details through background and/or camouflaging clutter, through plasma shrouds around hypersonic air vehicles, through the layers of concealment hiding underground facilities, IEDs, mines, and other threats—all while operating from an airborne platform or other suitable platform. Quantum radar system 100 may also improve the performance of advanced image processing and pattern recognition systems, as well as defeat most RF signature management systems when the propagation frequency is tuned to the resonant wave length of the target.

I suppose you will at least accept that it did not come from moron journalists now. An official Russian website with the topmost officials quoted with their reputation on the line, a patent from LM and a real life Chinese satellite should be plenty of proof that something is happening.

As far as the Russian system is concerned, it's only 2 or 3 years away. So it's not a long endless wait.

 

[moon_light]

Propaganda, eh? Even though this stuff has patents?

This one's from Lockheed Martin.

http://www.google.co.in/patents/US7375802
I suppose you will at least accept that it did not come from moron journalists now. An official Russian website with the topmost officials quoted with their reputation on the line, a patent from LM and a real life Chinese satellite should be plenty of proof that something is happening.

.

Dude read carefully, do you understand what they said ? :

A signal processor determines a characteristic of the target based on information derived from at least some of the entangled particles in the return signal. The frequency of the signal is selected to propagate the signal through a medium and the frequencies of the entangled particles are selected to provide sufficient data in the return signal to resolve the characteristic of the target.

embodiments include generating entangled photons, transmitting the entangled photons in a radio-frequency signal. The frequency of the signal is selected to propagate through a particular medium and the number of the entangled photons is determined by the desired resolution of the return signal.

As far as the Russian system is concerned, it's only 2 or 3 years away. So it's not a long endless wait

Not a chance , this thing is even more theoretical than the warp drive , imagine observing the spin of not one but every single particle good luck with that

 

[randomradio]

Dude read carefully, do you understand what they said ? :

Yes, but the statements you quoted say many things, so I don't know what you are referring to.

Not a chance , this thing is even more theoretical than the warp drive , imagine observing the spin of not one but every single particle good luck with that

It's used every day.

The idea of a quantum radar is to observe every single photon. That's why a major roadblock for this is the single photon detector in the microwave frequency.
http://phys.org/news/2011-02-breakthrough-photons-microwave-frequency-range.html
This system can emit and detect a single photon. And they seem to be making breakthroughs frequently. The military, even more so, since they are supported by larger manpower, budgets and facilities.

It is easily accomplished in the optical frequency.
https://en.wikipedia.org/wiki/Superconducting_nanowire_single-photon_detector
https://en.wikipedia.org/wiki/Single-photon_avalanche_diode

But to get all of the target characteristics, you still need all sorts of other information which can only be provided by averaging data over many photons. Like for phase, you need to average many photons after they are correlated with the idler photons.

 

[That_engineer_guy]

Yes, but the statements you quoted say many things, so I don't know what you are referring to.

I would guess he referring to the fact that you have to entangled every photons with ever single wave- particles that the radar emit, much easier said than done

It's used every day.

The idea of a quantum radar is to observe every single photon. That's why a major roadblock for this is the single photon detector in the microwave frequency.

This system can emit and detect a single photon. And they seem to be making breakthroughs frequently. The military, even more so, since they are supported by larger manpower, budgets and facilities.

It is easily accomplished in the optical frequency.

But to get all of the target characteristics, you still need all sorts of other information which can only be provided by averaging data over many photons. Like for phase, you need to average many photons after they are correlated with the idler photons.

Random radio, the system you quoted observed the spin of the photon by emits every single photon at a time, but the requirements for this "quantum radar" you talking about is that you must emit like a billions wave-particles at times while entangled each of them with a photons, and observed the spin direction of each and everyone photons that you have. It wont become reality for about 50-60 years

On the otherhand, RAM that work for wide range of frequency is alot more practical (LM has a pattern for that too) .

 

[randomradio]

I would guess he referring to the fact that you have to entangled every photons with ever single wave- particles that the radar emit, much easier said than done

Already been done. The Chinese satellite is already functional.

Entangling a microwave photon with an optical photon is actually pretty easy.

The Chinese satellite uses two optical photons, while the Russian radar could end up using a microwave and an optical photon. And this can easily be done to billions of photons, depending on how much you invest, although it's not necessary.

Random radio, the system you quoted observed the spin of the photon by emits every single photon at a time, but the requirements for this "quantum radar" you talking about is that you must emit like a billions wave-particles at times while entangled each of them with a photons, and observed the spin direction of each and everyone photons that you have. It wont become reality for about 50-60 years

Already a reality.
http://www.cbc.ca/news/technology/china-quantum-satellite-1.3349383

And it's far more awesome than you think it is.
http://qz.com/760804/chinas-new-qua...pace-and-time-and-create-an-unbreakable-code/

Classic mechanics is still important because you are still using classic mechanics transportation. Including if the idler photon is lost, then the probe beam is going to behave like it is with classic mechanics, but the data we get is far, far superior to what we have now with a system that switches to using electrons. The Russian system could progress that way, just saying. First a radar that works at the quantum level, like the ROFAR, and then a modification that allows it to move to the next level.

 

[That_engineer_guy]

Already been done. The Chinese satellite is already functional.

no it isn't , read carefully what they said, you have to understand the difference between the tested satellite and the so called quantum radar system you talking about, they both based on the spin of photon but the way they work is not the same

Besides demonstrating a super-long entanglement, the scientists working with the satellite want to test new communications technology. It’s important to realize that we can’t send information like “Hey, how are you?” through quantum teleportation, much less teleport actual things. But smart thinkers realized that being able to share basic information about the state of atomic particles across distance could create a powerful encryption tool.

This is where the unbreakable code comes in. Perhaps the most powerful method of encryption is the “one-time pad,” where messages are encoded using a private key known to both parties; theoretically, if the key is random, is as long as the message, is never reused, and is kept completely secret, it cannot be broken. Which sounds really good, code-wise, but it has long been impractical to ensure that two parties can always access a key that meets those standards.

Quantum entanglement could help. If people on two ground stations share access to a large enough set of entangled photons, beamed to them from a satellite in space, they can generate a sufficiently long, random key by teleporting quantum information between the entangled particles.

Nobody would be able to detect the transmission of the key. “It’s very secure from the point of view that if your eavesdropper wants to listen in, usually they are within space and time,” Michalakis says. “The data is not transmitted through space time, it goes underneath in mathematical subspace.”

Once the people in the two stations have created a key, using their entangled particles, they can use it to encrypt a message. This can be sent by whatever method they want. “You can use a telephone the moment you are sharing a key that nobody has access to,” Michalakis says.

Entangling a microwave photon with an optical photon is actually pretty easy.

No it isnt
and you dont just entangled a single photon, in a radar system you entangled billion photons

The Chinese satellite uses two optical photons, while the Russian radar could end up using a microwave and an optical photon. And this can easily be done to billions of photons, depending on how much you invest, although it's not necessary.

No it is not easy to do to a billions of photons at a time, you still dont understand, do you know how hard it it to just entangled 2 photons and observed only 2? let put it in a more simple example , with microscope it very easy to observe the shape of a single tiny gain of sand, does that mean it will be easy to observe billions of them at the same time? no.
Also because the system rely on entanglement, it would be very vulnerable to quantum decoherence which happens alot in high noise environment

Already a reality.And it's far more awesome than you think it is

you need to understand what they actually said, read, every words, not just the words quantum. The technical barrier for the quantum satellite here to create an unbreakable code and for your so called quantum radar to work are very very different
( the satellite only rely on entanglement of a few photons to work while your very theoretical quantum radar need both entanglement and quantum illumination to work, and the amount of photons that it need to observe is unbelievably huge)
.btw the theoretical quantum radar here would still obey physics law like attenuation and radar equation, there is no such thing as radar looking through aircraft fuselage from 400 km

 

[randomradio]

no it isn't , read carefully what they said, you have to understand the difference between the tested satellite and the so called quantum radar system you talking about, they both based on the spin of photon but the way they work is not the same

It's exactly the same, in principle.

No it isnt
and you dont just entangled a single photon, in a radar system you entangled billion photons

You don't need to entangle billions, not even millions.

No it is not easy to do to a billions of photons at a time, you still dont understand, do you know how hard it it to just entangled 2 photons and observed only 2? let put it in a more simple example , with microscope it very easy to observe the shape of a single tiny gain of sand, does that mean it will be easy to observe billions of them at the same time? no.

To answer your question, it is possible. Primarily because we are concerned with averages for some types of data and only a few photons with similar characteristics for some types of data.

Also because the system rely on entanglement, it would be very vulnerable to quantum decoherence which happens alot in high noise environment

I've already said how you deal with this in post #532.
Like for phase, you need to average many photons after they are correlated with the idler photons.

If entanglement is lost, then the photon will behave like it is for classic mechanics. There is a chance the photon itself is lost, it's not such a big problem. It happens with classic mechanics systems also. Regardless even with the entanglement lost, there is still some amount of data that the photon carries that can still be correlated with the idler photon.

With a ROFAR, you need significantly lower power to get the same results as a normal AESA. So the number of photons involved here are 'significantly' lower. And you don't need data from all the photons anyway.

you need to understand what they actually said, read, every words, not just the words quantum. The technical barrier for the quantum satellite here to create an unbreakable code and for your so called quantum radar to work are very very different
( the satellite only rely on entanglement of a few photons to work while your very theoretical quantum radar need both entanglement and quantum illumination to work, and the amount of photons that it need to observe is unbelievably huge)
.

The Chinese system uses quantum entanglement, illumination and teleportation.

The principle is exactly the same, but the radar needs to generate far more information than a simple communication system, that's why the extra 5 years. Or at least 5 years to get the first generation hardware working, ie, a system capable of interacting with photons directly. That alone is a huge advancement, enough to get a 20 times boost in resolution even after disregarding the fact that the Russians are advertising claims that can only be achieved by a quantum radar. The PHODIR doesn't use quantum entanglement, but it gets the job done with extremely high resolution and at ultra wideband frequencies.

And once again, no, you don't need billions at all. Dude you need to stop and think about it. For an eye to generate a signal to the brain, it needs only a maximum of 9 photons. You are actually creating a very complex picture with just 9 photons. 9 photons. Let that sink in. And to see an event clearly you need 30 photons. If the eye was bombarded with tens of thousands of photons, we would have evolved to use our ears and nose instead. Our cells cannot handle that type of energy.

A quantum radar acts exactly like the eye does, and it is far, far more efficient than the eye because there isn't stuff like eyelids and cornea protecting the radar and the aperture (spread out all over the fuselage) is massive compared to the eye, meaning it is actually designed to operate like the eye without any of the eye's disadvantages. And this eye is capable of emitting its own photons, an additional advantage.

The Chinese satellite is working with far more data than is expected from a quantum radar. So whatever the Chinese have managed to apply at the hardware level using their satellite can be used in a quantum radar too. The only difference is the hardware they made is good enough for a LIDAR whereas we want our quantum radar to work at the microwave frequency.

 

[AMDR]

Rumor is one F-35 is equal to 3 F-16CJs working together in terms of threat location. If so then than the Growler/JSF combo will be great for the carrier air wing.

 

[moon_light]

It's exactly the same, in principle.

No it isnt , while they both take advantage of entanglement , the working principle is completely different
like engineer guy said read what they wrote carefully , it is not the same as your theoretical quantum radar

It’s important to realize that we can’t send information like “Hey, how are you?” through quantum teleportation, much less teleport actual things. But smart thinkers realized that being able to share basic information about the state of atomic particles across distance could create a powerful encryption tool
his is where the unbreakable code comes in. Perhaps the most powerful method of encryption is the “one-time pad,” where messages are encoded using a private key known to both parties; theoretically, if the key is random, is as long as the message, is never reused, and is kept completely secret, it cannot be broken. Which sounds really good, code-wise, but it has long been impractical to ensure that two parties can always access a key that meets those standards.
Quantum entanglement could help. If people on two ground stations share access to a large enough set of entangled photons, beamed to them from a satellite in space, they can generate a sufficiently long, random key by teleporting quantum information between the entangled particles.
.

You don't need to entangle billions, not even millions.

You need to entangle exactly the number of wave-particle that you will transmit

To answer your question, it is possible. Primarily because we are concerned with averages for some types of data and only a few photons with similar characteristics for some types of data.

you still understand how it work do you ? , if you only entangle a few photons then you will never be able to be sure that its other entangled pair will go toward target direction , that why you need to entangle each and every wave-particle that you will transmit and keeping and observing it's other half separately from each other.

I've already said how you deal with this in post #532.
Like for phase, you need to average many photons after they are correlated with the idler photons.

You still dont understand , for quantum system to work , you need to know the spin state of the photons ( and deduce the state of it's entangled pair from that , but a noisy environment will break the entanglement link

If entanglement is lost, then the photon will behave like it is for classic mechanics. There is a chance the photon itself is lost, it's not such a big problem. It happens with classic mechanics systems also. Regardless even with the entanglement lost, there is still some amount of data that the photon carries that can still be correlated with the idler photon.

If the entanglement is lost then you lost the major advantage of quantum machine

With a ROFAR, you need significantly lower power to get the same results as a normal AESA. So the number of photons involved here are 'significantly' lower. And you don't need data from all the photons anyway.

that not how it work

The Chinese system uses quantum entanglement, illumination and teleportation.

random radio , you need to stop making things up to support your point
the Chinese statelite does not use quantum illumination , and they don't teleport the photons or any physical stuff either , you need to understand what they wrote

It’s important to realize that we can’t send information like “Hey, how are you?” through quantum teleportation, much less teleport actual things.

the only thing that they actually do is take advantage of the fact that they will only need to know the spin state of one photon to know the spin state of it's entangled pair regardless how far aways , it is not teleportation.

The principle is exactly the same, but the radar needs to generate far more information than a simple communication system, that's why the extra 5 years. Or at least 5 years to get the first generation hardware working, ie, a system capable of interacting with photons directly. That alone is a huge advancement,

the principal is not the same , extremely different
here is the quantum satellite , now go see how your quantum radar work

It’s important to realize that we can’t send information like “Hey, how are you?” through quantum teleportation, much less teleport actual things. But smart thinkers realized that being able to share basic information about the state of atomic particles across distance could create a powerful encryption tool
his is where the unbreakable code comes in. Perhaps the most powerful method of encryption is the “one-time pad,” where messages are encoded using a private key known to both parties; theoretically, if the key is random, is as long as the message, is never reused, and is kept completely secret, it cannot be broken. Which sounds really good, code-wise, but it has long been impractical to ensure that two parties can always access a key that meets those standards.
Quantum entanglement could help. If people on two ground stations share access to a large enough set of entangled photons, beamed to them from a satellite in space, they can generate a sufficiently long, random key by teleporting quantum information between the entangled particles.
.

enough to get a 20 times boost in resolution even after disregarding the fact that the Russians are advertising claims that can only be achieved by a quantum radar.

As everyone has said , there is no such thing as uniform resolution for any kind of radar. resolution will have to do with aperture size and operationg frequency.

The PHODIR doesn't use quantum entanglement, but it gets the job done with extremely high resolution and at ultra wideband frequencies..

it does take advantage of entanglement that what give it higher resolution , a wide frequency doesnt give you high resolution

And once again, no, you don't need billions at all. Dude you need to stop and think about it. For an eye to generate a signal to the brain, it needs only a maximum of 9 photons. You are actually creating a very complex picture with just 9 photons. 9 photons. Let that sink in. And to see an event clearly you need 30 photons. If the eye was bombarded with tens of thousands of photons, we would have evolved to use our ears and nose instead. Our cells cannot handle that type of energy..

Firstly the sensors in the retina can respond to a single photon. However, neural filters only allow a signal to pass to the brain to trigger a conscious response when at least about five to nine arrive within less than 100 ms. But being able to respond is not the same as being able to see clearly.A typical incandescent light bulb emits 3x10^18 visible-light photons per second and we can hardly see a light bulbs several km aways do you know why ? not all photons go into your eye .The same with the radar , if you only entangled several photons then what if it's entangled pair dont come back ( or even hit target ? )?, when they said quantum radar can see long distance they mean when it use very low frequency ( because high frequency will just be absorbed by the attmosphere ) , with the same aperture the lower frequency you go the less focused the beam will be , you literally will end up with most of your wave particles wont even go toward target , even less fraction will even reflected back , it not that you entangled billions of wave particile to get high resolution , you entangled a huge number of particles to make sure that it's pair will hit target and reflected back.

A quantum radar acts exactly like the eye does, and it is far, far more efficient than the eye because there isn't stuff like eyelids and cornea protecting the radar and the aperture (spread out all over the fuselage) is massive compared to the eye, meaning it is actually designed to operate like the eye without any of the eye's disadvantages. And this eye is capable of emitting its own photons, an additional advantage..

a quantum radar is not the same as the eye , not even remotely similar , quantum system observed the spin state of particles to deduce the spin state of it's pair , an eye is simply a photon detectors ( not much different from thermal system )

The Chinese satellite is working with far more data than is expected from a quantum radar. So whatever the Chinese have managed to apply at the hardware level using their satellite can be used in a quantum radar too. The only difference is the hardware they made is good enough for a LIDAR whereas we want our quantum radar to work at the microwave frequency.

No , it not even remotely similar , the satellite only need several pair of entangled particles to know what coding they use for their message , the radar will need millions , billions of them , and it need to know what entangled particle reflected back

 

[randomradio]

No it isnt , while they both take advantage of entanglement , the working principle is completely different
like engineer guy said read what they wrote carefully , it is not the same as your theoretical quantum radar

It's exactly the same. The Chinese skip a step in between because they use only optical frequency.

you still understand how it work do you ? , if you only entangle a few photons then you will never be able to be sure that its other entangled pair will go toward target direction , that why you need to entangle each and every wave-particle that you will transmit and keeping and observing it's other half separately from each other.

Yes, it's easy. Do you know how entanglement happens?

You still dont understand , for quantum system to work , you need to know the spin state of the photons ( and deduce the state of it's entangled pair from that , but a noisy environment will break the entanglement link

Even after a photon has undergone decoherence, it still contains a lot of information. Quantum illumination is used to take care of decoherence.

random radio , you need to stop making things up to support your point
the Chinese statelite does not use quantum illumination , and they don't teleport the photons or any physical stuff either , you need to understand what they wrote

the only thing that they actually do is take advantage of the fact that they will only need to know the spin state of one photon to know the spin state of it's entangled pair regardless how far aways , it is not teleportation.

The satellite uses both. Or the system won't work.
Heres a thesis on how they use quantum illumination in communication.
http://dspace.mit.edu/handle/1721.1/103793

In fact without quantum illumination you can't have a quantum-anything.

Quantum teleportation is a safety feature. The photons change state if it is intercepted and immediately lets the satellite or ground crew know.

So all major principles are used. Entanglement, illumination and teleportation. The physics is exactly the same for the radar also.

I understand what they wrote, you need to do some reading yourself first.

As everyone has said , there is no such thing as uniform resolution for any kind of radar. resolution will have to do with aperture size and operationg frequency.

100GHz, 900mm aperture, calculate resolution and beamwidth.

500THz, 1500mm aperture, calculate resolution and beamwidth.

Firstly the sensors in the retina can respond to a single photon. However, neural filters only allow a signal to pass to the brain to trigger a conscious response when at least about five to nine arrive within less than 100 ms. But being able to respond is not the same as being able to see clearly.A typical incandescent light bulb emits 3x10^18 visible-light photons per second and we can hardly see a light bulbs several km aways do you know why ? not all photons go into your eye .The same with the radar , if you only entangled several photons then what if it's entangled pair dont come back ( or even hit target ? )?, when they said quantum radar can see long distance they mean when it use very low frequency ( because high frequency will just be absorbed by the attmosphere ) , with the same aperture the lower frequency you go the less focused the beam will be , you literally will end up with most of your wave particles wont even go toward target , even less fraction will even reflected back , it not that you entangled billions of wave particile to get high resolution , you entangled a huge number of particles to make sure that it's pair will hit target and reflected back.

So you're saying we can't see the moon, the sun, the stars etc because visible light which uses extremely high frequencies travels through earth's atmosphere and is attenuated? I didn't know that.

No, you don't need billions. Because unlike light bulbs, we can actually aim at our target using beamsteering.

a quantum radar is not the same as the eye , not even remotely similar , quantum system observed the spin state of particles to deduce the spin state of it's pair , an eye is simply a photon detectors ( not much different from thermal system )

No , it not even remotely similar , the satellite only need several pair of entangled particles to know what coding they use for their message , the radar will need millions , billions of them , and it need to know what entangled particle reflected back

Okay, so the photons emitted from satellites are not attenuated then? And physics for quantum radar is different from a quantum satellite?

I didn't know the atmosphere is racist towards quantum radars. So the Chinese satellite goes through the same atmosphere and needs only a few photons, but a quantum radar that works at lower frequencies need more, billions in fact?

 

[That_engineer_guy]

It's exactly the same. The Chinese skip a step in between because they use only optical frequency.

@Radio : like everyone said, you need to understand what they wrote instead of just quoting without understanding anything at all. It clearly said in the article about quantum satellite that the pair of entangled particles are keep seperate aso that the user know what form of coding they would use, that is very different from the way it work in your theriotical quantum radar.

Yes, it's easy. Do you know how entanglement happens?
.

Iam sure he know what it is about from the way he wrote, but if you still dont know, normally we fired a laser at crystal to make pair of entanglement photons

Even after a photon has undergone decoherence, it still contains a lot of information. Quantum illumination is used to take care of decoherence.

decoherence often happens in noisy environment that why the radar will need it. But even with quantum illumination, you still lose significant advantage of quantum system if the entanglement break. (Btw no need to copy paste from Wikipedia here, iam sure everyone here understand what u talking about, this is rather simple part in quantum physics.)

The satellite uses both. Or the system won't work.e.

No it didn't need to, nor is there any evidence that quantum illumination was used, after all they only need very few pair of entanglement particles to transfer simple infor like what code they would use

Heres a thesis on how they use quantum illumination in communication.

If you actually read ( and understand) what you posted then you will see that the system in that thesis doesn't work in the same principle as the Chinese satellites, the Chinese satellite is alot more simple

In fact without quantum illumination you can't have a quantum-anything..

No offense but that is absolutely BS

Quantum teleportation is a safety feature. The photons change state if it is intercepted and immediately lets the satellite or ground crew know.

Radio, there is nothing actually being teleported here as clearly stated in the article, and it is not a safety features, it is a simple part of entanglement physics, the spin of the photon will be fixed when it is being measures, and the entanglement state will always be opposite of its entanglement pair, that why they will know when it being intercepted

So all major principles are used. Entanglement, illumination and teleportation. The physics is exactly the same for the radar also.

No and no, i dont want to be rude but your basis understanding of quantum physics is truly terrible.
There is not thing actually teleported in a quantum system, they only use that words because you always instantly know the state of a photon by measuring the state of its entangled pair regardless how far they are ( in fact this is even explained im your article but you just didn't read them)

100GHz, 900mm aperture, calculate resolution and beamwidth.

500THz, 1500mm aperture, calculate resolution and beamwidth..

That are pretty simple, range resolution will be decided by pulse width
angular resolution can be determined by this equation

So you're saying we can't see the moon, the sun, the stars etc because visible light which uses extremely high frequencies travels through earth's atmosphere and is attenuated? I didn't know that.

The power ( and the amount of photons comming from them) of the sun and the star are enormous compared to your radar
. Moreover if you pay attention you cant see them at all before the rain or through cloud, in morning most of the time you cant see stars and moon because it is too bright everywhere ( similar as effect of clutter on radar)

No, you don't need billions. Because unlike light bulbs, we can actually aim at our target using beamsteering.

beam steering and beam forming doesn't solve beam width problem of radar.

Okay, so the photons emitted from satellites are not attenuated then?

they do but
1) the quantum satellite only need a few photons to come through, because they don't transmit major information by these photons, they merely use the photons as a ways to let the base know what coding they will use for their communication transmission, aka very basic information

2) the satellite only need to successfully send the entanglement photons once and it is literally a straight line from ground to the satellite, so they can easily choose the suitable clear weather, spot to transmit those photons, after that these photons can be keep and observed to determine what coding will be used, It is also important to note that the radar with its wave near parallel to earth surface will so faced alot more problems with cloud cover and similar stuff compared to satellite firing it's laser perpendicular to the earth surface ( similar reason why the sun is brightest at noon but isn't very bright in sun rise and sun set)

And physics for quantum radar is different from a quantum satellite?

just because they both have the words quantum and entanglement doesn't mean their basis working principles is the same, there are alot more to quantum machine

"I didn't know the atmosphere is racist towards quantum radars. So the Chinese satellite goes through the same atmosphere and needs only a few photons, but a quantum radar that works at lower frequencies need more, billions in fact?

I already explained this before but as a bonus points
1) the satellite doesn't need reflection and it only need a few pair of entanglement photons to transmit coding information
2)laser light are very very directional compared to low frequency electronic transmitter