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The SECOQC quantum key distribution network in Vienna
- M. Peev, C. Pacher, A. Zeilinger
- Computer ScienceEuropean Conference on Optical Communication
- 22 March 2009
The paper presents the architecture and functionality of the principal networking agent—the SECOQC node module, which enables the authentic classical communication required for key distillation, manages the generated key material, determines a communication path between any destinations in the network, and realizes end-to-end secure transport of key material between these destinations.
Experimental demonstration of long-distance continuous-variable quantum key distribution
A detection system based on homodyne detectors is developed to achieve an unprecedented level of stability and new codes tailored to perform secure communication optimally in a range of signal-to-noise ratios corresponding to long distances.
Quantum key distribution over 25 km with an all-fiber continuous-variable system
We report on the implementation of a reverse-reconciliated coherent-state continuous-variable quantum key distribution system, with which we generated secret keys at a rate of more than 2 kb/s over…
Highly efficient single-photon detection at communication wavelengths by use of upconversion in reverse-proton-exchanged periodically poled LiNbO3 waveguides.
- C. Langrock, E. Diamanti, R. Roussev, Y. Yamamoto, M. Fejer, H. Takesue
- PhysicsOptics Letters
- 1 July 2005
This work presents a single-photon detection system, operating at communication wavelengths, based on guided-wave frequency upconversion in a nonlinear crystal with an overall system detection efficiency exceeding 46% at 1.56 microm.
Distributing Secret Keys with Quantum Continuous Variables: Principle, Security and Implementations
The principle of continuous-variable quantum key distribution is described, focusing in particular on protocols based on coherent states, and the security of these protocols is discussed and the state-of-the-art in experimental implementations are reported, including the issue of side-channel attacks.
Practical challenges in quantum key distribution
Before QKD can be widely adopted, it faces a number of important challenges such as secret key rate, distance, size, cost and practical security, according to a survey of key challenges.
Improvement of continuous-variable quantum key distribution systems by using optical preamplifiers
- S. Fossier, E. Diamanti, T. Debuisschert, R. Tualle-Brouri, P. Grangier
- Physics, Computer Science
- 22 December 2008
This paper deriving the modified secret key generation rates when an optical parametric amplifier is placed at the output of the quantum channel shows that the use of preamplifiers does compensate all the imperfections of the detectors when the amplifier is optimal in terms of gain and noise.
Analysis of Imperfections in Practical Continuous-Variable Quantum Key Distribution
This work considers the influence of phase noise in the preparation stage of the protocol and argues that taking this noise into account can improve the secret key rate because this source of noise is not controlled by the eavesdropper.
Asymptotic Security of Continuous-Variable Quantum Key Distribution with a Discrete Modulation
- Shouvik Ghorai, P. Grangier, E. Diamanti, Anthony Leverrier
- Computer Science, MathematicsPhysical Review X
- 4 February 2019
We establish a lower bound on the asymptotic secret key rate of continuous-variable quantum key distribution with a discrete modulation of coherent states. The bound is valid against collective…
Field test of a continuous-variable quantum key distribution prototype
- S. Fossier, E. Diamanti, T. Debuisschert, A. Villing, R. Tualle-Brouri, P. Grangier
- Computer Science
- 17 December 2008
A prototype that implements a continuous-variable quantum key distribution protocol based on coherent states and reverse reconciliation, which uses time and polarization multiplexing for optimal transmission and detection of the signal and phase reference, and employs sophisticated error-correction codes for reconciliation.