TY - JOUR
T1 - Arbitrarily complete Bell-state measurement using only linear optical elements
AU - Grice, W. P.
PY - 2011/10/19
Y1 - 2011/10/19
N2 - A complete Bell-state measurement is not possible using only linear-optic elements, and most schemes achieve a success rate of no more than 50%, distinguishing, for example, two of the four Bell states but returning degenerate results for the other two. It is shown here that the introduction of a pair of ancillary entangled photons improves the success rate to 75%. More generally, the addition of 2N-2 ancillary photons yields a linear-optic Bell-state measurement with a success rate of 1-1/2N.
AB - A complete Bell-state measurement is not possible using only linear-optic elements, and most schemes achieve a success rate of no more than 50%, distinguishing, for example, two of the four Bell states but returning degenerate results for the other two. It is shown here that the introduction of a pair of ancillary entangled photons improves the success rate to 75%. More generally, the addition of 2N-2 ancillary photons yields a linear-optic Bell-state measurement with a success rate of 1-1/2N.
UR - http://www.scopus.com/inward/record.url?scp=80054774304&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.84.042331
DO - 10.1103/PhysRevA.84.042331
M3 - Article
AN - SCOPUS:80054774304
SN - 1050-2947
VL - 84
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 4
M1 - 042331
ER -