Null Values and Quantum State Discrimination
Quantum Physics
2013-04-30 v2 Mesoscale and Nanoscale Physics
Abstract
We present a measurement protocol for discriminating between two different quantum states of a qubit with high fidelity. The protocol, called null value, is comprised of a projective measurement performed on the system with a small probability (also known as partial-collapse), followed by a tuned postselection. We report on an optical experimental implementation of the scheme. We show that our protocol leads to an amplified signal-to-noise ratio (as compared with a straightforward strong measurement) when discerning between the two quantum states.
Cite
@article{arxiv.1205.3877,
title = {Null Values and Quantum State Discrimination},
author = {Oded Zilberberg and Alessandro Romito and David J. Starling and Gregory A. Howland and Curtis J. Broadbent and John C. Howell and Yuval Gefen},
journal= {arXiv preprint arXiv:1205.3877},
year = {2013}
}
Comments
11 pages, 6 figures, 5 appendices