Heisenberg-Weyl Observables: Bloch vectors in phase space

Ali Asadian, Paul Erker, Marcus Huber, Claude Klöckl

Research output: Contribution to journalArticleResearchpeer-review

24 Citations (Scopus)

Abstract

© 2016 American Physical Society. We introduce a Hermitian generalization of Pauli matrices to higher dimensions which is based on Heisenberg-Weyl operators. The complete set of Heisenberg-Weyl observables allows us to identify a real-valued Bloch vector for an arbitrary density operator in discrete phase space, with a smooth transition to infinite dimensions. Furthermore, we derive bounds on the sum of expectation values of any set of anticommuting observables. Such bounds can be used in entanglement detection and we show that Heisenberg-Weyl observables provide a first nontrivial example beyond the dichotomic case.
Original languageEnglish
Article number010301
JournalPhysical Review A
Volume94
Issue number1
DOIs
Publication statusPublished - 19 Jul 2016

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