Conclusive quantum steering with superconducting transition-edge sensors.
Conclusive quantum steering with superconducting transition-edge sensors.
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DOI:
10.1038/ncomms1628
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发表时间:
2012-01-10
影响因子:
16.6
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中科院分区:
文献类型:
--
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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. Untrustworthy sources or detectors mean that quantum entanglement cannot always be ensured, but quantum steering inequalities can verify its presence. Using a highly efficient system, Smith et al. are able to close the detection loophole and clearly demonstrate steering between two parties.
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