Heralded photon amplification for quantum communication

CI Osorio, N Bruno, N Sangouard, H Zbinden… - Physical Review A …, 2012 - APS
Physical Review A—Atomic, Molecular, and Optical Physics, 2012APS
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±0.20 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. We …
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 for a state with a maximum expected gain . 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. We discuss these results in the context of experimental device-independent quantum key distribution based on heralded qubit amplification, and we highlight several key challenges for its realization.
American Physical Society
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