A description of entanglement in terms of quantum phase
arXiv:quant-ph/0202100 · doi:10.1103/PhysRevA.66.042112
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.
11 pages, previous title has changed, new section added, corrected typos, no figures
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- Extremal Entanglement For Triqubit Pure States
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