Secure quantum key distribution
An overview is given of the state-of-the-art research into secure communication based on quantum cryptography, together with its assumptions, strengths and weaknesses.
Field test of quantum key distribution in the Tokyo QKD Network.
Two GHz-clocked QKD links enable the world-first secure TV conferencing over a distance of 45km to be demonstrated and detection of an eavesdropper, rerouting into a secure path, and key relay via trusted nodes are demonstrated in this network.
Quantum key distribution over a 40-dB channel loss using superconducting single-photon detectors
The keys generated in the first quantum key distribution experiment to enable the creation of secure keys over 42 dB channel loss and 200 km of optical fibre are secure against both general collective attacks on individual photons and a specific collective attack on multiphotons.
All-photonic quantum repeaters
This work presents a protocol based on photonic cluster-state machine guns and a loss-tolerant measurement equipped with local high-speed active feedforwards and shows that, with such all-photonic quantum repeaters, the communication efficiency scales polynomially with the channel distance.
Inside Quantum Repeaters
- W. Munro, Koji Azuma, K. Tamaki, K. Nemoto
- PhysicsIEEE Journal of Selected Topics in Quantum…
- 15 January 2015
Most quantum communication tasks need to rely on the transmission of quantum signals over long distances. Unfortunately, transmission of such signals is most often limited by losses in the channel,…
Loss-tolerant quantum cryptography with imperfect sources
This work suggests that the state preparation process in QKD can be significantly less precise than initially thought, and proposes a novel and general approach that makes QKKD loss-tolerant to state preparation flaws.
Differential-phase-shift quantum key distribution
- H. Takesue, T. Honjo, K. Tamaki, Y. Tokura
- PhysicsDigest of the LEOS Summer Topical Meetings
- 1 May 2009
A novel type of quantum key distribution (QKD) protocol called differential-phase-shift (DPS) QKD is described. It utilizes a weak coherent pulse train instead of individual photons as in…
Phase encoding schemes for measurement-device-independent quantum key distribution with basis-dependent flaw
This work proposes two schemes for the phase encoding, the first one employs a phase locking technique with the use of non-phase-randomized coherent pulses, and the second one uses conversion of standard BB84 phase encoding pulses into polarization modes and proves the unconditional security of these schemes.
Differential phase shift-quantum key distribution
Quantum-key distribution has been studied as an ultimate method for secure communications, and now it is emerging as a technology that can be deployed in real fiber networks. Here, we present our QKD…
Unconditional security of a three state quantum key distribution protocol.
- J. Boileau, K. Tamaki, J. Batuwantudawe, R. Laflamme, J. Renes
- Computer SciencePhysical Review Letters
- 13 August 2004
This Letter proves the unconditional security of the trine spherical code QKD protocol, demonstrating its security up to a bit error rate of 9.81%.