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Description of entanglement in terms of quantum phase
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.ORCID iD: 0000-0002-2082-9583
2002 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 66, no 4Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2002. Vol. 66, no 4
Keyword [en]
conjugate variables, relative phase, 2 qubits, state, gate, representation, distributions, difference, algorithm, universal
Identifiers
URN: urn:nbn:se:kth:diva-22087DOI: 10.1103/PhysRevA.66.042112ISI: 000179502200022OAI: oai:DiVA.org:kth-22087DiVA: diva2:340785
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Björk, Gunnar

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