Hoban, MJ;
Browne, DE;
(2011)
Stronger Quantum Correlations with Loophole-Free Postselection.
PHYS REV LETT
, 107
(12)
, Article 120402. 10.1103/PhysRevLett.107.120402.
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Abstract
One of the most striking nonclassical features of quantum mechanics is in the correlations it predicts between spatially separated measurements. In local hidden variable theories, correlations are constrained by Bell inequalities, but quantum correlations violate these. However, experimental imperfections lead to loopholes whereby LHV correlations are no longer constrained by Bell inequalities, and violations can be described by LHV theories. For example, loopholes can emerge through selective detection of events. In this Letter, we introduce a clean, operational picture of multiparty Bell tests, and show that there exists a nontrivial form of loophole-free postselection. Surprisingly, the same postselection can enhance quantum correlations, and unlock a connection between nonclassical correlations and nonclassical computation.
| Type: | Article |
|---|---|
| Title: | Stronger Quantum Correlations with Loophole-Free Postselection |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.107.120402 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.107.120402 |
| Language: | English |
| Additional information: | © 2011 American Physical Society |
| Keywords: | BELLS-INEQUALITY, PRINCIPLE, VIOLATION, STATES |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1319983 |
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