Conclusive quantum steering with superconducting transition edge sensors
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 standard deviations. Our results provide a clear path to practical applications of steering and to a photonic loophole-free Bell test.
Cite
@article{arxiv.1111.0829,
title = {Conclusive quantum steering with superconducting transition edge sensors},
author = {Devin H. Smith and Geoff Gillett and Marcelo de Almeida and Cyril Branciard and Alessandro Fedrizzi and Till J. Weinhold and Adriana Lita and Brice Calkins and Thomas Gerrits and Howard M. Wiseman and Sae Woo Nam and Andrew G. White},
journal= {arXiv preprint arXiv:1111.0829},
year = {2012}
}
Comments
Preprint of 7 pages, 3 figures; the definitive version is published in Nature Communications, see below. Also, see related experimental work by A. J. Bennet et al., arXiv:1111.0739 and B. Wittmann et al., arXiv:1111.0760