Heralded photon amplification for quantum communication

Details Heralded photon amplification for quantum communication Heralded photon amplification for quantum communication

2012-03-15

arxiv.org/abs/1203.3396v2

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

Heralded noiseless amplification based on single-photon sources and linear optics is ideally suited for long-distance quantum communication tasks based on discrete variables. We experimentally demonstrate such an amplifier, operating at telecommunication wavelengths. Coherent amplification is performed with a gain of G=1.98+/-0.2, for a state with a maximum expected gain G=2. We also demonstrate that there is no need for a stable phase reference between the initial signal state and the local auxiliary photons used by the amplifier. These results highlight the potential of heralded quantum amplifiers for long-distance quantum communication, and bring device-independent quantum key distribution one step closer.

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