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Entanglement gain in measurements with unknown results

Entanglement gain in measurements with unknown results

Title: Entanglement gain in measurements with unknown results
Author: Zuppardo, Margherita
Ganardi, Ray
Miller, Marek
Bandyopadhyay, Somshubhro
Paterek, Tomasz
Date: 2019-04-10
Language: English
Scope: 042319
University/Institute: Háskóli Íslands
University of Iceland
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Department: Raunvísindastofnun (HÍ)
Science Institute (UI)
Series: Physical Review A;99(4)
ISSN: 2469-9926
2469-9934 (eISSN)
DOI: 10.1103/PhysRevA.99.042319
Subject: Quantum entanglement; Global measurements; Two particles; Skammtafræði; Atóm
URI: https://hdl.handle.net/20.500.11815/1774

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Zuppardo, M., Ganardi, R., Miller, M., Bandyopadhyay, S., & Paterek, T. (2018). Entanglement gain in measurements with unknown results. ArXiv.org, 99(4), ArXiv.org, Jun 14, 2018.


We characterize nonselective global projective measurements capable of increasing quantum entanglement between two particles. In particular, by choosing negativity to quantify entanglement, we show that entanglement of any pure nonmaximally entangled state can be improved in this way (but not of any mixed state) and we provide detailed analysis for two qubits. It is then shown that Markovian open system dynamics can only approximate such measurements, but this approximation converges exponentially fast as illustrated using the Araki-Żurek model. We conclude with numerical evidence that macroscopic bodies in a random pure state do not gain negativity in a random nonselective global measurement.


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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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