Conclusive quantum steering with superconducting transition-edge sensors

Devin H. Smith (), Geoff Gillett, Marcelo P. de Almeida, Cyril Branciard, Alessandro Fedrizzi, Till J. Weinhold, Adriana Lita, Brice Calkins, Thomas Gerrits, Howard M. Wiseman, Sae Woo Nam and Andrew G. White
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Devin H. Smith: Centre for Engineered Quantum Systems and Centre for Quantum Computation and Communication Technology (Australian Research Council), University of Queensland
Geoff Gillett: Centre for Engineered Quantum Systems and Centre for Quantum Computation and Communication Technology (Australian Research Council), University of Queensland
Marcelo P. de Almeida: Centre for Engineered Quantum Systems and Centre for Quantum Computation and Communication Technology (Australian Research Council), University of Queensland
Cyril Branciard: School of Mathematics and Physics, University of Queensland, 4072 Brisbane, Queensland, Australia.
Alessandro Fedrizzi: Centre for Engineered Quantum Systems and Centre for Quantum Computation and Communication Technology (Australian Research Council), University of Queensland
Till J. Weinhold: Centre for Engineered Quantum Systems and Centre for Quantum Computation and Communication Technology (Australian Research Council), University of Queensland
Adriana Lita: National Institute of Standards and Technology
Brice Calkins: National Institute of Standards and Technology
Thomas Gerrits: National Institute of Standards and Technology
Howard M. Wiseman: Centre for Quantum Computation and Communication Technology (Australian Research Council), Centre for Quantum Dynamics, Griffith University
Sae Woo Nam: National Institute of Standards and Technology
Andrew G. White: Centre for Engineered Quantum Systems and Centre for Quantum Computation and Communication Technology (Australian Research Council), University of Queensland

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: 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.

Date: 2012
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DOI: 10.1038/ncomms1628

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