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Title: Quantum entanglement from random measurements
Authors: Tran, Minh Cong
Dakić, Borivoje
Arnault, François
Laskowski, Wiesław
Paterek, Tomasz
Keywords: Physics & Applied Physics
Issue Date: 2015
Source: Tran, M. C., Dakić, B., Arnault, F., Laskowski, W., & Paterek, T. (2015). Quantum entanglement from random measurements. Physical Review A, 92(5), 050301-.
Series/Report no.: Physical Review A
Abstract: We show that the expectation value of squared correlations measured along random local directions is an identifier of quantum entanglement in pure states, which can be directly experimentally assessed if two copies of the state are available. Entanglement can therefore be detected by parties who do not share a common reference frame and whose local reference frames, such as polarizers or Stern-Gerlach magnets, remain unknown. Furthermore, we also show that in every experimental run, access to only one qubit from the macroscopic reference is sufficient to identify entanglement, violate a Bell inequality, and, in fact, observe all phenomena observable with macroscopic references. Finally, we provide a state-independent entanglement witness solely in terms of random correlations and emphasize how data gathered for a single random measurement setting per party reliably detects entanglement. This is only possible due to utilized randomness and should find practical applications in experimental confirmation of multiphoton entanglement or space experiments.
ISSN: 1050-2947
DOI: 10.1103/PhysRevA.92.050301
Schools: School of Physical and Mathematical Sciences 
Rights: © 2015 American Physical Society. This paper was published in Physical Review A and is made available as an electronic reprint (preprint) with permission of American Physical Society. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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