A description of entanglement in terms of quantum phase

Details A description of entanglement in terms of quantum phase A description of entanglement in terms of quantum phase

2002-02-19

arxiv.org/abs/quant-ph/0202100v2

Phys. Rev. A 66, 042112 (2002)

Physics

Quantum Physics

11 pages, previous title has changed, new section added, corrected typos, no figures

Scientific paper

10.1103/PhysRevA.66.042112

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.

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