Universal Optimal Quantum Correlator
Abstract
Recently, a novel operational strategy to access quantum correlation functions of the form Tr[A rho B] was provided in [F. Buscemi, M. Dall'Arno, M. Ozawa, and V. Vedral, arXiv:1312.4240]. Here we propose a realization scheme, that we call partial expectation values, implementing such strategy in terms of a unitary interaction with an ancillary system followed by the measurement of an observable on the ancilla. Our scheme is universal, being independent of rho, A, and B, and it is optimal in a statistical sense. Our scheme is suitable for implementation with present quantum optical technology, and provides a new way to test uncertainty relations.
Cite
@article{arxiv.1409.2237,
title = {Universal Optimal Quantum Correlator},
author = {Francesco Buscemi and Michele Dall'Arno and Masanao Ozawa and Vlatko Vedral},
journal= {arXiv preprint arXiv:1409.2237},
year = {2015}
}
Comments
5 pages, 2 figures, submitted as a proceeding of the Quantum 2014 conference, Turin, Italy, 25-31 May, 2014