Heralded photon amplification for quantum communication

Year: 2012

Authors: Osorio C.I., Bruno N., Sangouard N., Zbinden H., Gisin N., Thew R.T.

Autors Affiliation: Univ Geneva, Appl Phys Grp, CH-1211 Geneva 4, Switzerland.

Abstract: 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 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.

Journal/Review: PHYSICAL REVIEW A

Volume: 86 (2)      Pages from: 23815-1  to: 23815-4

More Information: We would like to thank W. Solher and the Integrated Optics Group at the University of Paderborn for the development and fabrication of the custom PPLN waveguide. We also acknowledge useful discussions with C. Branciard and financial support from the EU project Q-essence and the Swiss project NCCR-QSIT.
KeyWords: State
DOI: 10.1103/PhysRevA.86.023815

Citations: 84
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