PT Journal
AU Smith, DH
   Gillett, G
   de Almeida, MP
   Branciard, C
   Fedrizzi, A
   Weinhold, TJ
   Lita, A
   Calkins, B
   Gerrits, T
   Wiseman, HM
   Nam, SW
   White, AG
TI Conclusive quantum steering with superconducting transition-edge sensors
SO Nature Communications
JI Nat. Comm.
PY 2012
BP 6
VL 3
IS 625
DE fromIPMRAS
AB 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.
ER