Implementation of projective measurements with linear optics and continuous photon counting
Abstract
We investigate the possibility of implementing a given projection measurement using linear optics and arbitrarily fast feedforward based on the continuous detection of photons. In particular, we systematically derive the so-called Dolinar scheme that achieves the minimum error discrimination of binary coherent states. Moreover, we show that the Dolinar-type approach can also be applied to projection measurements in the regime of photonic-qubit signals. Our results demonstrate that for implementing a projection measurement with linear optics, in principle, unit success probability may be approached even without the use of expensive entangled auxiliary states, as they are needed in all known (near-)deterministic linear-optics proposals.
Cite
@article{arxiv.quant-ph/0410133,
title = {Implementation of projective measurements with linear optics and continuous photon counting},
author = {Masahiro Takeoka and Masahide Sasaki and Peter van Loock and Norbert Lütkenhaus},
journal= {arXiv preprint arXiv:quant-ph/0410133},
year = {2009}
}
Comments
11 pages, 2 figures, updated to the published version