Entanglement consumption of instantaneous nonlocal quantum measurements

S R Clark, A J Connor, D Jaksch, S Popescu

Research output: Contribution to journalArticle (Academic Journal)peer-review

20 Citations (Scopus)

Abstract

Relativistic causality has dramatic consequences on the measurability of nonlocal variables and poses the fundamental question of whether it is physically meaningful to speak about the value of nonlocal variables at a particular time. Recent work has shown that by weakening the role of the measurement in preparing eigenstates of the variable, it is in fact possible to measure all nonlocal observables instantaneously by exploiting entanglement. However, for these measurement schemes to succeed with certainty, an infinite amount of entanglement must be distributed initially and all this entanglement is necessarily consumed. In this work, we sharpen the characterization of instantaneous nonlocal measurements by explicitly devising schemes in which only a finite amount of the initially distributed entanglement is ever utilized. This enables us to determine an upper bound to the average consumption for the most general cases of nonlocal measurements.
Translated title of the contributionEntanglement consumption of instantaneous nonlocal quantum measurements
Original languageEnglish
Pages (from-to)083034-1 - 083034-35
Number of pages35
JournalNew Journal of Physics
Volume12
DOIs
Publication statusPublished - Aug 2010

Bibliographical note

Publisher: Insitute of Physics Publishing

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