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Title: Entanglement gain in measurements with unknown results
Authors: Zuppardo, Margherita
Ganardi, Ray
Miller, Marek
Bandyopadhyay, Somshubhro
Paterek, Tomasz
Keywords: Entanglement Manipulation
Entanglement Production
Issue Date: 2019
Source: Zuppardo, M., Ganardi, R., Miller, M., Bandyopadhyay, S., & Paterek, T. (2019). Entanglement gain in measurements with unknown results. Physical Review A, 99(4), 042319-. doi:10.1103/PhysRevA.99.042319
Series/Report no.: Physical Review A
Abstract: 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.
ISSN: 2469-9926
DOI: 10.1103/PhysRevA.99.042319
Rights: © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review A and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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