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Probing single-photon state tomography using phase-randomized coherent states

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Abstract

Quantum processes involving single-photon states are of broad interest, in particular, for quantum communications. Extending to continuous values a recent proposal by Yuan et al. [Phys. Rev. A 94, 062305 (2016) [CrossRef]  ], we show that single-photon quantum processes can be characterized using phase-randomized coherent states (PRCS) as inputs. As a proof of principle, we present the experimental investigation of single-photon tomography using PRCS. The probability distribution of field quadrature measurements for single-photon states can be accurately derived from the PRCS data. As a consequence, the Wigner function and the density matrix of single-photon states are reconstructed with good precision. The sensitivity of the reconstruction to experimental errors and the number of PRCS used is addressed.

© 2017 Optical Society of America

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