Selective and efficient quantum process tomography with single photons
Abstract
We present the results of the first photonic implementation of a new method for quantum process tomography. The method (originally presented by A. Bendersky et al, Phys. Rev. Lett 100, 190403 (2008)) enables the estimation of any element of the chi-matrix that characterizes a quantum process using resources that scale polynomially with the number of qubits. It is based on the idea of mapping the estimation of any chi-matrix element onto the average fidelity of a quantum channel and estimating the latter by sampling randomly over a special set of states called a 2-design. With a heralded single photon source we fully implement such algorithm and perform process tomography on a number of channels affecting the polarization qubit. The method is compared with other existing ones and its advantages are discussed.
Cite
@article{arxiv.1002.4436,
title = {Selective and efficient quantum process tomography with single photons},
author = {Christian Tomás Schmiegelow and Miguel Antonio Larotonda and Juan Pablo Paz},
journal= {arXiv preprint arXiv:1002.4436},
year = {2010}
}
Comments
4 pages, 4 figures, Accepted for publication in Phys. Rev. Lett