Nonlocal generalized quantum measurements of bipartite spin products without maximal entanglement

P. Vidil, K. Edamatsu

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Measuring a nonlocal observable on a space-like separated quantum system is a resource-hungry and experimentally challenging task. Several theoretical measurement schemes have already been proposed to increase its feasibility, using a shared maximally-entangled ancilla. We present a new approach to this problem, using the language of generalized quantum measurements, to show that it is actually possible to measure a nonlocal spin product observable without necessarily requiring a maximally-entangled ancilla. This approach opens the door to more economical arbitrary-strength nonlocal measurements, with applications ranging from nonlocal weak values to possible new tests of Bell inequalities. The relation between measurement strength and the amount of ancillary entanglement needed is made explicit, bringing a new perspective on the links that tie quantum nonlocality, entanglement and information transmission together.

本文言語English
論文番号043004
ジャーナルNew Journal of Physics
23
4
DOI
出版ステータスPublished - 2021 4月

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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