China Quantum Communiations Technology: Cryptography, Radar, Satellite, Teleportation, Network

[JSCh]

Radar ‘closer to spotting stealth jets’ with Chinese quantum project

Quantum particles in a man-made electromagnetic storm bounced back after hitting stealth object, increasing chance of detection, according to Tsinghua University team.

www.scmp.com

 

[JSCh]

City-wide quantum data network in China is the largest ever built

A quantum network linking 40 computers in Hefei, China, is the largest demonstration to date of how a future quantum internet might work

www.newscientist.com

 

[JSCh]

https://twitter.com/x/status/1440835805954461704

A 15-user quantum secure direct communication network - Light: Science & Applications

A 15-user quantum secure direct communication (QSDC) network is experimentally demonstrated, and any two users can perform QSDC task over 40 kilometers of optical fiber.

www.nature.com

 

[JSCh]

New record for fibre-based quantum key distribution.

https://twitter.com/x/status/1483532035620696065

 

[JSCh]

Chinese scientists from Tsinghua University for the 1st time realized world's longest quantum secure direct communication distance over 100 km fiber with time-bin and phase quantum states, contributing to inter-city quantum secure direct communication under relay-less conditions.

https://twitter.com/x/status/1513743714698498048

https://twitter.com/x/status/1511919729341964289

 

[JSCh]

A fiber-based quantum cryptography network can moonlight as a vibration sensor system.

https://twitter.com/x/status/1521146648210071554

 

[Song Hong]

Chinese scientists from Tsinghua University for the 1st time realized world's longest quantum secure direct communication distance over 100 km fiber with time-bin and phase quantum states, contributing to inter-city quantum secure direct communication under relay-less conditions.

https://twitter.com/x/status/1513743714698498048

https://twitter.com/x/status/1511919729341964289

read this paper -- which is why I feel Quantum is a scam in most cases. I reckon it will not even reach 1k bps in 100 years.

The pre-requisite for spectral purity to excite photons or particles is incredibly large and very wasteful. FYI, I did quantum engineering in industries for 2 years.

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This QSDC system has dispensed of quantum memory, and significantly increased the secure information rate as well. Explicitly, it realized secure transmission at 3.2 bps through an 18 km fiber at a clock-rate of 1 MHz.

 

[JSCh]

Three research groups have independently performed proof-of-principle experiments of an unhackable quantum encryption method. Researchers call the demonstrations “a major breakthrough for cybersecurity.” Read the story by
@sophurky

https://twitter.com/x/status/1552334472158265344

 

[JSCh]

Researchers have demonstrated an optically connected pair of entangled quantum memories separated by 12.5 km; the longest physical separation so far achieved.

https://twitter.com/x/status/1552672634114117632

 

[JSCh]

Compact QKD system paves the way to cost-effective #satellite-based quantum networks
@opticalsociety

@OpticalSociety
https://doi.org/gqn4nc

https://twitter.com/x/status/1560319128279334912

 

[JSCh]

Paving the Way for Satellite Quantum Communications

A series of demonstrations by Micius—a low-orbit satellite with quantum capabilities—lays the groundwork for a satellite-based quantum communication network.

physics.aps.org

 

[Splurgenxs]

read this paper -- which is why I feel Quantum is a scam in most cases. I reckon it will not even reach 1k bps in 100 years.

The pre-requisite for spectral purity to excite photons or particles is incredibly large and very wasteful. FYI, I did quantum engineering in industries for 2 years.

Why is it wasteful, is it not based on q coupling and splitting particles and measuring the state on the other end?

 

[JSCh]

Dawn of solid-state quantum networks

Researchers demonstrated high-visibility quantum interference between two independent semiconductor quantum dots — an important step toward scalable quantum networks

spie.org

https://twitter.com/x/status/1608278832556933120

 

[K_Bin_W]

If the quantum communication is intercepted, the information contained will be destroyed automatically. Meanwhile, communicators know that this communication is intercepted.

That's the whole point because it cannot be intercepted,

 

[JSCh]

Scientists realize faster method for quantum #keydistribution @physrevlett https://doi.org/grq9f3

https://twitter.com/x/status/1623326743267344387