TY - JOUR
T1 - Closing the detection loophole in multipartite Bell tests using Greenberger-Horne-Zeilinger states
AU - Pal, Karoly F.
AU - Vertesi, Tamas
AU - Brunner, Nicolas
PY - 2012/12/19
Y1 - 2012/12/19
N2 - We investigate the problem of closing the detection loophole in multipartite Bell tests, and show that the required detection efficiencies can be significantly lowered compared to the bipartite case. In particular, we present Bell tests based on n-qubit Greenberger-Horne-Zeilinger states, which can tolerate efficiencies as low as 38% for a reasonable number of parties and measurements. Even in the presence of a significant amount of noise, efficiencies below 50% can be tolerated, which is encouraging given recent experimental progress. Finally, we give strong evidence that, for a sufficiently large number of parties and measurements, arbitrarily small efficiencies can be tolerated, even in the presence of an arbitrary large amount of noise.
AB - We investigate the problem of closing the detection loophole in multipartite Bell tests, and show that the required detection efficiencies can be significantly lowered compared to the bipartite case. In particular, we present Bell tests based on n-qubit Greenberger-Horne-Zeilinger states, which can tolerate efficiencies as low as 38% for a reasonable number of parties and measurements. Even in the presence of a significant amount of noise, efficiencies below 50% can be tolerated, which is encouraging given recent experimental progress. Finally, we give strong evidence that, for a sufficiently large number of parties and measurements, arbitrarily small efficiencies can be tolerated, even in the presence of an arbitrary large amount of noise.
KW - ENTANGLEMENT
KW - INEQUALITY
U2 - 10.1103/PhysRevA.86.062111
DO - 10.1103/PhysRevA.86.062111
M3 - Article (Academic Journal)
SN - 1050-2947
VL - 86
JO - Physical Review A: Atomic, Molecular and Optical Physics
JF - Physical Review A: Atomic, Molecular and Optical Physics
IS - 6
M1 - 062111
ER -