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

TL;DR

This paper demonstrates that phase-randomized coherent states can be used to effectively perform single-photon state tomography, enabling accurate reconstruction of quantum states with practical experimental methods.

Contribution

It extends a recent theoretical proposal by experimentally validating single-photon tomography using phase-randomized coherent states as inputs.

Findings

Successful experimental reconstruction of single-photon states

Accurate derivation of quadrature distributions from PRCS data

Analysis of reconstruction sensitivity to errors and sample size

Abstract

Quantum processes involving single-photon states are of broad interest in particular for quantum communication. Extending to continuous values a recent proposal by Yuan et al \cite{YUAN16}, 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 quadratures 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.