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Minimal Entanglement Witness from Electrical Current Correlations

Brange, Fredrik LU ; Malkoc, Ognjen LU and Samuelsson, Peter LU (2017) In Physical Review Letters 118.
Abstract (Swedish)
Despite great efforts, an unambiguous demonstration of entanglement of mobile electrons in solid state conductors is still lacking. Investigating theoretically a generic entangler-detector setup, we here show that a witness of entanglement between two flying electron qubits can be constructed from only two current cross correlation measurements, for any nonzero detector efficiencies and noncollinear polarization vectors. We find that all entangled pure states, but not all mixed ones, can be detected with only two measurements, except the maximally entangled states, which require three. Moreover, detector settings for optimal entanglement witnessing are presented.
Abstract
Despite great efforts, an unambiguous demonstration of entanglement of mobile electrons in solid state conductors is still lacking. Investigating theoretically a generic entangler-detector setup, we here show that a witness of entanglement between two flying electron qubits can be constructed from only two current cross correlation measurements, for any nonzero detector efficiencies and noncollinear polarization vectors. We find that all entangled pure states, but not all mixed ones, can be detected with only two measurements, except the maximally entangled states, which require three. Moreover, detector settings for optimal entanglement witnessing are presented.
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
118
publisher
American Physical Society
external identifiers
  • scopus:85010924561
  • wos:000392290200025
ISSN
1079-7114
DOI
10.1103/PhysRevLett.118.036804
language
English
LU publication?
yes
id
60b5d9bc-60b3-4b85-84ad-9e5338d4cf44
date added to LUP
2017-02-08 21:11:12
date last changed
2018-01-07 11:49:06
@article{60b5d9bc-60b3-4b85-84ad-9e5338d4cf44,
  abstract     = {Despite great efforts, an unambiguous demonstration of entanglement of mobile electrons in solid state conductors is still lacking. Investigating theoretically a generic entangler-detector setup, we here show that a witness of entanglement between two flying electron qubits can be constructed from only two current cross correlation measurements, for any nonzero detector efficiencies and noncollinear polarization vectors. We find that all entangled pure states, but not all mixed ones, can be detected with only two measurements, except the maximally entangled states, which require three. Moreover, detector settings for optimal entanglement witnessing are presented.},
  articleno    = {036804},
  author       = {Brange, Fredrik and Malkoc, Ognjen and Samuelsson, Peter},
  issn         = {1079-7114},
  language     = {eng},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Minimal Entanglement Witness from Electrical Current Correlations},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.118.036804},
  volume       = {118},
  year         = {2017},
}