A description of entanglement in terms of quantum phase
Quantum Physics
2007-05-23 v2
Abstract
We explore the role played by the phase in an accurate description of the entanglement of bipartite systems. We first present an appropriate polar decomposition that leads to a truly Hermitian operator for the phase of a single qubit. We also examine the positive operator-valued measures that can describe the qubit phase properties. When dealing with two qubits, the relative phase seems to be a natural variable to understand entanglement. In this spirit, we propose a measure of entanglement based on this variable.
Keywords
Cite
@article{arxiv.quant-ph/0202100,
title = {A description of entanglement in terms of quantum phase},
author = {Luis L. Sanchez-Soto and Julian Delgado and Andrei B. Klimov and Gunnar Bjork},
journal= {arXiv preprint arXiv:quant-ph/0202100},
year = {2007}
}
Comments
11 pages, previous title has changed, new section added, corrected typos, no figures