Continuous Variable Quantum Cryptography - beating the 3 dB loss limit

Details Continuous Variable Quantum Cryptography - beating the 3 dB loss limit Continuous Variable Quantum Cryptography - beating the 3 dB loss limit

2002-04-11

arxiv.org/abs/quant-ph/0204064v3

Phys. Rev. Lett. 89, 167901 (2002)

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.89.167901

We demonstrate that secure quantum key distribution systems based on continuous variables implementations can operate beyond the apparent 3 dB loss limit that is implied by the beam splitting attack . The loss limit was established for standard minimum uncertainty states such as coherent states. We show that by an appropriate postselection mechanism we can enter a region where Eve's knowledge falls behind the information shared between Alice and Bob even in the presence of substantial losses.

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