Interconvertibility of single-rail optical qubits
Quantum Physics
2009-11-11 v1
Abstract
We show how to convert between partially coherent superpositions of a single photon with the vacuum using linear optics and postselection based on homodyne measurements. We introduce a generalized quantum efficiency for such states and show that any conversion that decreases this quantity is possible. We also prove that our scheme is optimal by showing that no linear optical scheme with generalized conditional measurements, and with one single-rail qubit input can improve the generalized efficiency.
Keywords
Cite
@article{arxiv.quant-ph/0507216,
title = {Interconvertibility of single-rail optical qubits},
author = {Dominic W. Berry and Alexander I. Lvovsky and Barry C. Sanders},
journal= {arXiv preprint arXiv:quant-ph/0507216},
year = {2009}
}
Comments
3 pages, 2 figures