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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

191 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

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