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China's Quantum Radar Could Detect Stealth Planes, Missiles (popsci.com)
hackingbear shares a report from Popular Science: China Electronics Technology Group Corporation (CETC), China's foremost military electronics company, announced that its groundbreaking quantum radar has achieved capability of tracking high altitude objects, likely by increasing the coherence time entangled photons. CETC envisions that its quantum radar will be used in the stratosphere to track objects in "the upper atmosphere and beyond" (including space). Quantum can identify the position, radar cross section, speed, direction and even "observe" on the composition of the target such as differentiating between an actual nuclear warhead against inflatable decoys. [...] Importantly, attempts to spoof the quantum radar would be easily noticed since any attempt to alter or duplicate the entangled photons would be detected by the radar. The news is an important illustration of a larger trend of Chinese advancement in the new, crucial area of quantum research. Other notable projects in China's quantum technology include the Micius satellite, and advances by Alibaba and the Chinese University of Science and Technology in a world record of entangling 18 photons (a quantum supercomputer would require about 50 entangled photons), such that China arguably leads the world in quantum technologies.
I suspect it's not JASSM-ER-proof.
We should implement Blockchain RADAR immediately as a response to this newfangled Quantum RADAR.
Huh, looks like something's wrong with the microverse battery.
We're gonna have to go inside.
It must have been something you assimilated. . . .
They get two coherent photons, bounce one of a plane, receive it again and compare it to the original photon to see what's changed.
Obviously it's not 'quantum entanglement' anything, because if it was, the BOUNCED PHOTON AND COMPARISON PHOTON WOULD ALSO CHANGE by fuzzy action at a distance.
Sort of the exact opposite, since you need the original photon to not change to match the bounced photon. So if entanglement actually worked, this system wouldn't work.
Sounds like Interferometry 101.
just take regular radar circa ww2 if allied or well soviet radars up to till today and gasp you'll see stealth planes... accuracy suffers bit... but theyre not stealth at all..
we did practice problems on this back in Physics 2 several years ago. Stern-Gerlach to the rescue again. Really, not a problem in theory or practice for quite a while.
Why would China brag about this new advanced technology, telling the world that a "quantum radar" is indeed possible? To mislead westerners? If they really achieved such amazing military weaponry success, wouldn't they better keep silent? Or maybe China is simply aware of their superiority in quantum fields, which is more worrying..
Slashdot, fix the reply notifications... You won't get away with it...
This phrase MEANS NOTHING:
"likely by increasing the coherence time entangled photons"
EDITORS, EDIT !!!
EDITORS, EDIT !!!
YMBNH.
To have a right to do a thing is not at all the same as to be right in doing it
Their Lazer Rifle
turned out to be a lie.
How can we believe in the lies provided by China
Ordinarily I would dismiss this as a deliberate distraction from stuff China can actually do. But I recall numerous examples from the Cold War between the US and Russia where the US poo-poo'd Russian abilities, but after the cold war ended it turned out Russian abilities really were superior. I'm not inclined to dismiss this out-of-hand no matter how science fictiony it sounds.
If video games influenced behavior the Pac Man generation would be eating pills and running away from their problems.
because I don't understand the practical difference between "quantum" radar and regular radar. The linked Popular Science explains the difference as regular radar reflects photons and the quantum radar bounces photons (from the target). Hmmm. I actually DO understand that a QR can't (theoretically) be spoofed by active countermeasures (since it should filter out non-entangled photons), but other than that, what's the difference? (I also understand that some of the quantum entanglement stuff may eventually lead to more sensitive detectors - but there are more practical ways to increase S/N in fixed ground based systems, I'd guess....
I am a researcher in the quantum communication area. Admittedly I can only judge by the poorly written Pop Science article, but the whole thing triggers my BS detector.
"the coherence time entangled photons", "Quantum can identify..." - bad grammar is already a red flag.
The whole "spoofing can be detected" sounds like someone made some confusion with QKD (quantum key distribution), a completely unrelated application of quantum technology.
Finally, "a quantum supercomputer would require about 50 entangled photons"... Seriously, this is nonsense. I can't even.
Quantum entanglement has only been demonstrated in labs or down shielded cables with high frequency EM , ie light. Not with radio waves and not in the outdoor enviroment. It sounds like someone in the chinese Ministry of Propaganda has slung together a load of terminology picked at random from an undergrad physics book to try and impress. Plus as others have said, if it really worked it would be about as top secret as you can get.
The Russians have been able to spot them for years using "radar" that looks at disturbances in background radiation.
Anyway, why send a $1bn plane in to drop bombs when a cluster of supersonic or hypersonic missiles will do exactly the same thing for a few $m a piece.
So, 30 years from an actual deployable hardware solution.
Got it.
Start with a pair of *entangled* photons, send one out to potentially bounce off an object, and wait for possible return -- and measure the random polarization or whatever of the first photon, and measure the polarization of the reflected photon. If you observe a high fraction of correlations in these measurements, you know your transmitted photons actually hit an object, and are not *generated* by countermeasures. There is no practical way for an opponent to spoof a reflection, because only you have the entangled second photon to verify that the first photon originated from you! It's genius!
Why would China brag about this new advanced technology, telling the world that a "quantum radar" is indeed possible?
Let's assume this technology actually exists and works more or less as indicated. If you have a technology to plan to use as a deterrent, there is no point in keeping it a secret from the people you are trying to deter. A credible threat forces the other party to adjust their behavior. Keeping a weapon secret that you plant to user for deterrence is likely to be counterproductive.
Now let's say that they don't have this technology and are bluffing. If they can get the other party to react to a non-existent threat then that has value as well. Of course the downside is if your bluff gets called. Say what you want about the US military but they are pretty good at what they do and getting them to bite on this if it isn't true is going to be challenging.
Baaahaahahaaaaha!!!
I'm not, but it feels like Groundhog Day :-(
Captcha: "annoyed"
You never let your enemy know your position.
No, you let them know your position when it is useful to let them know your position. You keep it a secret when that is more useful. There are times for each approach. If you are trying to deter an aggressor from attacking in the first place you don't keep it a secret that attacking you would be a bad idea. A deterrence kept a secret isn't a deterrence at all.
You are quite right that many times it is useful to not show your full capabilities. But sometimes it is more valuable to let some information be known.
The Chinese are bluffing because of the trade war and trying to spread FUD. They're screwed and they know it.
Screwed? Not likely. Only delusional idiots like our president actually believe that a pointless trade war will benefit the US and hurt China. It's going to hurt both sides without any likely upside to anyone. And this has literally nothing to do with that unless you think the trade war is going to turn into a shooting war. Pray that doesn't come to pass.
Maybe a few years more education would help you. What are you smoking? It smells to high heaven. (That's where the stealth fighters fly)
That's the advantage of Chinese hypertext.
Maelcum produced a white lump of foam slightly smaller than Case's head, fished a pearl-handled switchblade on a green nylon lanyard out of the hip pocket of his tattered shorts and carefully slit the plastic. He extracted a rectangular object and passed it to Case. `Thas part some gun, mon?'
`No,' Case said, turning it over, `but it's a weapon. It's virus.'
`Not on thisboy tug, mon,' Maelcum said firmly, reaching for the steel cassette.
`A program. Virus program. Can't get into you, can't even get into your software. I've got to interface it through the deck, before it can work on anything...'
`What is this thing?' he asked the Hosaka. `Parcel for me.'
`Data transfer from Bockris Systems GmbH, Frankfurt, advises, under coded transmission, that content of shipment is Kuang Grade Mark Eleven penetration program. Bockris further advises that interface with Ono-Sendai Cyberspace 7 is entirely compatible and yields optimal penetration capabilities, particularly with regard to existing military systems...'
He slotted the Chinese virus, paused, then drove it home.
`Okay,' he said, `we're on..."
`Christ on a crutch,' the Flatline said, `take a look at this.'
The Chinese virus was unfolding around them. Polychrome shadow, countless translucent layers shifting and recombining. Protean, enormous, it towered above them, blotting out the void. `Big mother,' the Flatline said.
How can an entangled virtual photon be any better at distinguishing between a F-35 and a pelican than a boring old conventional radar?
Maybe something made by https://pdos.csail.mit.edu/archive/scigen/ ?
If it’s real they stole it from us.
Quantum radar will expose stealth aircraft
the US govt developed this tech 40 years ago. the chinese stole the technology and just now figured out how to kind of make it work. they sell a home version on aliexpress for cheap, but it'll only last two uses before breaking. but you can throw it away and buy another.
Scott
Quantum Stealth beats quantum radar. What's next in the future technology tree?
Did China just re-align their deflector array to emit a quantum burst?
Knowing where something is, what it is and where it's going may be a lot easier than destroying it. Someone may be able to develop methods for fooling the detection, blocking it or overwhelming it with false information.
In a time of universal deceit, telling the truth is a revolutionary act. George Orwell
In Soviet China, quantums entangle YOU!
(-1: Post disagrees with my already-settled worldview) is not a valid mod option.
Clearly there is a precedent
https://www.youtube.com/watch?v=Wvf38cnmO_k
This next one is, or at least a radar base on this principal. The Chinese are the ones doing this particular experiment, so they are likely ahead of the pack already.
Here is the basis for my concept:
Cao, Y., Li, Y.-H., Cao, Z., Yin, J., Chen, Y.-A., Yin, H.-L., Pan, J.-W. (2017).
Direct counterfactual communication via quantum Zeno effect.
Proceedings of the National Academy of Sciences, 5.
http://doi.org/10.1073/pnas.16...
Basically, you set up a special inferometer where one channel *could* theoretically propagate to the target (Alice->Bob) and potentially reflect back, while the other channel is actually measured (Alice->Alice). The changes on the target side (e.g. Bobs remote configuration) then changes the measured value as seen on the originating side (Alice), but no photons are physically required nor measured propagating to the target! In essence, you now have a radar that does not radiate, thus it isn't giving away your position. It is able to sense changes on the other side using no actual photons. Its a stealth radar, and perfect for my next basement F-35 upgrade project.
Any investors out there?
On the trade war, it's important to be clear about who the participants in the war are and what their role is. It's not the US vs. China; it's the US government against the Chinese government, with the Chinese government playing the game with the assets of the Chinese nation.
It's governments playing games with OUR money. Both sides.
This is a bit like invading Russia. It's a truism that invading Russia is a bad idea; like most truisms it's only true some of the time. Sure there are historical examples of disastrous invasions, but there are just as many examples of successful invasions.
Name one successful invasion of Russia in the last 250 years.
A trade war with the PRC isn't an intrinsically bad idea; it's a matter of timing.
As a general proposition it's a terrible idea. At the end of the day the only result is going to be a lot of economic hardship for people like you and me on both sides of the ocean and elsewhere. The only time a trade war is a "good" idea is when one country is threatening a vital resource or asset. The US government should be more concerned with helping build up US business rather than trying to tear down Chinese ones.
A trade war with the PRC isn't an intrinsically bad idea; it's a matter of timing.
I disagree but let's assume that is true for the sake of argument. How would you know the time is right? You probably wouldn't. So basically it is huge gamble with no likely winner but a near certainty of economic hardship. And let's assume we wage a trade war all in against China. What does "victory" look like? What is the goal of these tariffs? What specific concessions is Trump trying to get from China? You'll notice that he has picked a fight without deciding on a victory condition. Anyone who starts a fight without a very specific goal for the end game is an idiot. Doubly so for someone fighting with other people's money.
Thanks to our liberal policies of selling our manufacturing and know how to China it is inevitable, that they will be the next superpower and we will fall like Britain did.
Trump attempts are most likely too little too late. Not mentioning that he is facing bonehead opposition of fools.
This just sounds like buzzword bingo to me.
Now we need to use it to detect those stealthy space ships passing by.
Will raspberry jam still work?
Okay, the chines calendar year is different from what "the west" has agreed upon. This awfully sounds like an april's fools joke.
Most other military organizations don't talk much about scientific breakthroughs that they are either working on or have actually made, certainly not unless they have to. How odd that China's military should be so open and aboveboard about things you would think they would rather keep quiet. Is this the same country that's trying so hard to keep its people from the internet, and that has even been known to crack down on people using words like "emigration," and names like "Winnie-the-Pooh?"
The adherence to a leader who lies continually IS the cultural trait that will drag America into a century of shame
Trump said he would be strong on immigration. He is.
We would pull out of the Iran nuclear deal. We did.
He would stand up to North Korea. He did. It worked.
He would lower taxes. He did.
He would fight for better trade deals. He is.
Every time someone calls Trump a liar in blanket terms shows they are fully detached from reality and reinforces his base's faith in him and losing blue votes. No sane person wants to keep the company of people that can no longer tell what they want to be real from reality itself.
Want eight years of Trump? Keep calling him a liar.
There is no way they can do that, because there is no such thing as quantium mechanics. That unproven THEORY is just that, right along with Relativity. Einstein is completely wrong and Tesla was right.
So that you can lace both glasses, drink from either, and have your opponent perish :)
If they've cracked quantum detection, don't be so confident about simple kinetic countermeasures -- let alone asymmetric tactics.
*if* being the operative word. It is also possible that they haven't cracked quantum detection, they don't think it's practical, and they are saying they have in order to get others (notably the US) to divert military budget money into the tech. You know, like the US did with its Star Wars program a few years back.
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