Quantum Encrypted Communication Between Drones

Zhenda Xie at Nanjing University has created cheap quantum encrypted communication between drones.

Above – Quantum network and physical realization with mobile drone-based nodes. (a) A practical quantum network consists of multinode structure and should provide access for users at any time. (b) If link distance is over the Rayleigh length limit, the beam aperture will be divergent and become larger than the receiver telescope, which inevitably brings loss to the system.

A laser on board one of the 35-kilogram drones created a pair of entangled photons by splitting a single photon with a crystal. One photon was sent directly to a ground station and the other to a second drone a kilometer away via a relay drone.

Motorised devices on each drone moved to ensure that the receivers and transmitters always lined up, and photons were focused and steered through the relay drone by a short piece of fibre-optic cable. The state of each photon was measured at the ground station and the results proved that the photons remained entangled.

Xie hopes that connections of over 300 kilometres can be achieved by more advanced drones at high altitude, free of the distorting influence of pollution and weather, and that smaller, more cost-effective drones could be produced for local connections, perhaps even to moving vehicles. All of these devices could link to satellites for global transmission.

Physical Review Letters – Optical-Relayed Entanglement Distribution Using Drones as Mobile Nodes

Entanglement distribution has been accomplished using a flying drone, and this mobile platform can be generalized for multiple mobile nodes with optical relay among them. Here we develop the first optical relay to reshape the wavefront of photons for their low diffraction loss in free-space transmission. Using two drones, where one distributes the entangled photons and the other serves as relay node, we achieve entanglement distribution with Clauser-Horne-Shimony-Holt at 1 km distance. Key components for entangled source, tracking, and relay are developed with high performance and are lightweight, constructing a scalable airborne system for multinode connection and toward mobile quantum networks.

SOURCES- New Scientist, Physical Review Letters
Written By Brian Wang, Nextbigfuture.com

8 thoughts on “Quantum Encrypted Communication Between Drones”

  1. China can't innovate right, will collapse…I am not sure if you noticed but this world's first quantum communication drone system was developed at Nanjing University in China. Like I said to you and similar minded guys last year, China is just starting now. Barely reached development level when we start to see original cutting edge innovations, few days ago they presented world's first high-temperature superconducting high-speed maglev(not regular maglev like Japan and Germany, this is new type), identified KAT7 gene as a driver of cellular senescence(big progress in aging research), developed advanced diamond based microelectronics, developed an integrated quantum memory with on-demand retrieval capability(huge step in creating quantum computer), demonstrated the teleportation of high-dimensional states in a three-dimensional six-photon system, figured out that α‐ketoglutarate delays age‐related fertility decline in mammals and a lot of other sci-tech achievements happened. All this in span of last week or so

    New era for China and world began. Now we have 3 big hubs of world sci-tech progress – US, Europe and new one – China. Because of all this additional output human civilization as a whole will progress much, much faster, which is great

  2. What happens when you fly into fog and/or air pollution? You know what is cheaper and probably better? Electronic one time pads.

  3. Just an *educated* guess, but they are not looking for faster than light info, so it may be much easierto *just* encrypt.

  4. Sending entangled photons is all well and good, but you cannot send information through those photons because you cannot force the photon you have to collapse to a specific state and you cannot tell whether the entangled twin has had its state collapse or not. Is there something |I'm missing about this "quantum comm"?

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