Continuous variable quantum cryptography: Beating the 3 dB loss limit

Silberhorn, Christine; Ralph, TC; Lütkenhaus, Norbert; Leuchs, Gerd

doi:10.1103/PhysRevLett.89.167901

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Continuous variable quantum cryptography: Beating the 3 dB loss limit

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Silberhorn, C., Ralph, T., Lütkenhaus, N., & Leuchs, G. (2002). Continuous variable quantum cryptography: Beating the 3 dB loss limit. PHYSICAL REVIEW LETTERS, 89(16): 167901. doi:10.1103/PhysRevLett.89.167901.

Cite as: https://hdl.handle.net/21.11116/0000-0002-97CC-E

Abstract

We demonstrate that secure quantum key distribution systems based on
continuous variable 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 on Alice's key falls behind the
information shared between Alice and Bob, even in the presence of
substantial losses.