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, Andrew G. White

Research output: Contribution to journalArticle

169 Citations (Scopus)

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 similar to 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.

Original languageEnglish
Article number625
Number of pages6
JournalNature Communications
Volume3
DOIs
Publication statusPublished - Jan 2012

Keywords

  • CURRENT SITUATION
  • BELLS-INEQUALITY
  • VIOLATION
  • MECHANICS
  • ENTANGLEMENT
  • PHOTONS
  • STATES
  • FIBER

Cite this

Smith, D. H., Gillett, G., de Almeida, M. P., Branciard, C., Fedrizzi, A., Weinhold, T. J., Lita, A., Calkins, B., Gerrits, T., Wiseman, H. M., Nam, S. W., & White, A. G. (2012). Conclusive quantum steering with superconducting transition-edge sensors. Nature Communications, 3, [625]. https://doi.org/10.1038/ncomms1628