Single-Photon Interference in Sidebands of Phase-Modulated Light for Quantum Cryptography
- 22 February 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 82 (8) , 1656-1659
- https://doi.org/10.1103/physrevlett.82.1656
Abstract
We report single-photon interference in the sidebands of modulated light. The relative phase of interacting quantum states is reliably controlled by the phase of a low-frequency modulating signal. We show how this type of interference can be used to build a robust system for quantum cryptography. An experiment was implemented at 1540 nm, over a 20-km-long standard single-mode fiber, using a germanium singlephoton avalanche photodiode.Keywords
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