Continuous variable quantum key distribution with modulated entangled states
- 1 January 2012
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Communications
- Vol. 3 (1), 1083
- https://doi.org/10.1038/ncomms2097
Abstract
Quantum key distribution enables two remote parties to grow a shared key, which they can use for unconditionally secure communication over a certain distance. The maximal distance depends on the loss and the excess noise of the connecting quantum channel. Several quantum key distribution schemes based on coherent states and continuous variable measurements are resilient to high loss in the channel, but are strongly affected by small amounts of channel excess noise. Here we propose and experimentally address a continuous variable quantum key distribution protocol that uses modulated fragile entangled states of light to greatly enhance the robustness to channel noise. We experimentally demonstrate that the resulting quantum key distribution protocol can tolerate more noise than the benchmark set by the ideal continuous variable coherent state protocol. Our scheme represents a very promising avenue for extending the distance for which secure communication is possible.Keywords
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This publication has 29 references indexed in Scilit:
- Continuous variable quantum key distribution based on optical entangled states without signal modulationEurophysics Letters, 2009
- Continuous-Variable Quantum Key Distribution Protocols Over Noisy ChannelsPhysical Review Letters, 2009
- de Finetti Representation Theorem for Infinite-Dimensional Quantum Systems and Applications to Quantum CryptographyPhysical Review Letters, 2009
- Optimality of Gaussian Attacks in Continuous-Variable Quantum CryptographyPhysical Review Letters, 2006
- Extremality of Gaussian Quantum StatesPhysical Review Letters, 2006
- Quantum Cryptography Without SwitchingPhysical Review Letters, 2004
- Continuous Variable Quantum Cryptography: Beating the 3 dB Loss LimitPhysical Review Letters, 2002
- Continuous Variable Quantum Cryptography Using Coherent StatesPhysical Review Letters, 2002
- Secure quantum key distribution using squeezed statesPhysical Review A, 2001
- Continuous variable quantum cryptographyPhysical Review A, 1999