Conclusive quantum steering with superconducting transition-edge sensors

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Smith, Devin H
Gillett, Geoff
de Almeida, Marcelo P
Branciard, Cyril
Fedrizzi, Alessandro
Weinhold, Till J
Lita, Adriana
Calkins, Brice
Gerrits, Thomas
Wiseman, Howard M
Nam, Sae Woo
White, Andrew G
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2012
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Abstract

Quantum steering allows two parties to verify shared entanglement even if one measurement device is untrusted. A conclusive demonstration of steering through the violation of a steering inequality is of considerable fundamental interest and opens up applications in quantum communication. To date, all experimental tests with single-photon states have relied on post selection, allowing untrusted devices to cheat by hiding unfavourable events in losses. Here we close this 'detection loophole' by combining a highly efficient source of entangled photon pairs with superconducting transition-edge sensors. We achieve an unprecedented ~62% conditional detection efficiency of entangled photons and violate a steering inequality with the minimal number of measurement settings by 48 s.d.s. Our results provide a clear path to practical applications of steering and to a photonic loophole-free Bell test.

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Nature Communications
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3
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© 2012 Nature Publishing Group. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
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Quantum information, computation and communication
Quantum optics and quantum optomechanics
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