Physics – Quantum Physics
Scientific paper
2011-11-03
Nature Communications 3, 625 (2012)
Physics
Quantum Physics
Preprint of 7 pages, 3 figures; the definitive version is published in Nature Communications, see below. Also, see related exp
Scientific paper
10.1038/ncomms1628
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 standard deviations. Our results provide a clear path to practical applications of steering and to a photonic loophole-free Bell test.
Almeida Marcelo de
Branciard Cyril
Calkins Brice
Fedrizzi Alessandro
Gerrits Thomas
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