Articles about quantum communications

Beam of light

Dirty carbon nanotubes offer telcos chance at secure quantum comms

Single-photon emitters aren't a new thing in physics labs, but they usually require liquid-helium-chilled freezers. America's Los Alamos National Laboratories (LANL) reckons it's cracked a difficult double: a telecom-frequency single photon emitter that works at room temperature. This has potential because the two key …
Crypto fingers

Quantum crypto upstart QuintessenceLabs hopes to cut the cord

With AU$3.26m from Australia's government, quantum crypto outfit QuintessenceLabs has set to work getting the fibre out of its diet, and instead running quantum key exchange over free space. While there have been scientific demonstrations of quantum exchanges both terrestrially and between earth and satellites, …
Photon, image via Shutterstock

Japan joins quantum space race with microsatellite demo

Japan has become the latest country to demonstrate quantum communication with a satellite, in this case a micro-satellite named SOCRATES. The National Institute of Information and Communication Technology (NICT) announced the quantum key distribution (QKD) test, which showed off the capabilities of its SOTA quantum …
Twisted light image - University of Rochester

Boffins twist light to carry 2.05 bits in one photon

Orbital angular momentum – in photonics short-handed as “twisted light” – can help expand the capacity of comms systems using quantum communications. Since quantum key distribution (QKD) is already a commercial, if pricey, market segment, quantum communication science is of a more practical application today than quantum …

Boffins want to put Quanta in containers, after docking

Don't laugh: a group of Japanese and Australian boffins want to use container ships to carry around entangled quanta. Entanglement is hard to maintain over any great distance – a few tens of kilometres through optical fibre, a hundred or so through the atmosphere – because of noise. Repeaters are forbidden by the “no-cloning …
Delft University's quantum teleportation setup

Quantum teleportation gets reliable at Delft

A research group at Delft University of Technology has set the lesser-brained among the world's science writers in an absolute tizz by demonstrating what it describes as reliable quantum teleportation. Of course, mention quantum phenomena like entanglement (and therefore teleportation) and the only angle anyone can think of is …
padlock

Quantum Key Distribution proven to work over everyday fibre

A group which in 2012 gave a laboratory demonstration of quantum key distribution (QKD) using lit fibre has taken its next step, demonstrating its technology in a field trial in the UK. Two years ago, El Reg reported the National Physical Laboratory (NPL) led a project that achieved a 500 Kbps key distribution rate on a 50km …
Illistration of single photon setup

Single chip photon source brings quantum comms closer

Down at the “basic research” level, there's a lot the labs can accomplish with quantum mechanics: entanglement, information teleportation, simple quantum computations and more. Now, an international collaboration believes it's brought exploitation of quantum effects closer to a commercial development. The researchers have …

EXPOSED: bizarre quantum sibling LOVE TRIANGLE

University of Waterloo boffins have demonstrated a three-way quantum entanglement that shows quantum non-locality can work with more than two particles.* The regulars of quantum physics, Bob and Alice, and the interloper Charlie, had an appropriately trailer-trash setting, but alas saw precious little one-on-one photon action …
ANU student with quantum comms apparatus

'Software amplifier' boosts quantum signals

Even in quantum communications, adjusting the parameters of Shannon's Theorem can help improve reach and range. A group of Australian National University (ANU) researchers has found a way to extend the reach of quantum communications by improving the signal-to-noise ratio of quantum systems. Their work, published in Nature …

Quantum comms can be made even more secure

Quantum mechanics can be used to create the “perfect” digital signature, but in practice, it's held back by the technical impossibility of retaining quantum states for more than a few seconds. Now, a group of researchers from the UK, Croatia and Greece is proposing a scheme they say would make quantum digital signatures (QDS) …
The Register breaking news

Boffins confirm quantum crypto can keep a secret

Over recent years, the gap between theoretical security of quantum crytography and practical implementation has provided plenty of fun for super-geniuses the world over. Yes, quantum cryptography is supposed to be unbreakable. After all, if anybody even observes the state of a qubit that Alice has prepared, entangled with …

Australian unis to test quantum-comms-over-fibre

The University of New South Wales, one of the world's leaders in quantum computing research, will get the chance to put its work to the test in Australia's capital city, Canberra. Within a few months, two nodes on Canberra's ICON network – one at the Australian National University, the other at the Australian Defence Force …

Scientists ‘untangle’ quantum communications

Entanglement is one of the foundations of quantum communications, since that’s the property that makes quantum communication schemes secure*. So why is a group of scientists from Japan and the UK proposing to work without entanglement? A study in Nature Photonics (abstract) led by Bill Munro – a research scientist with NTT’s …
Array of multicoloured LEDs reminiscent of the matrix

Boffins receive quantum key from moving plane

A group of German researchers has taken a step closer to achieving quantum key distribution with satellites, receiving quantum keys transmitted by a moving airplane. The experiment is described in this paper (PDF) presented to the QCrypt conference in Singapore last week. Led by Sebastian Nauerth at the Ludwig Maximilian …
The Register breaking news

German scientists link two labs with ‘universal quantum network’

German researchers have demonstrated a technique that allows them to create entanglement between atoms in different places, using photons to put the atoms into an entangled state. Quantum effects have already crept into the cryptography world, in which entangled pairs of photons are used for key exchange. However, in the new …
The Register breaking news

Quantum crypto for consumer GPON

Get ready to add another gadget to your Jetsons want-it-one-day list: personal quantum encryption. Although vulnerable to man-in-the-middle attacks by kitted-up boffins with access to the fibre, quantum key distribution (QKD) is still secure enough to give nightmares to spooks already scrambling to catch up with ordinary …

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