TY - JOUR
T1 - Optimal estimation of an unknown maximally entangled state with local operations and classical communication
AU - Zhang, Shengli
AU - Zou, Xubo
AU - Li, Ke
AU - Jin, Chenhui
AU - Guo, Guangcan
PY - 2007/10/18
Y1 - 2007/10/18
N2 - We consider the optimal measurement procedures for estimating an unknown maximally entangled state with local operations and classical communications (LOCC). By the "optimal," we mean that there is no other LOCC measurements that can provide a higher estimation fidelity. In fact, we first use the positive partial transpose constraint to obtain an upper bound of the fidelity; then, we show there exists a kind of LOCC measurement that can attain such a bound. The estimation fidelity of the optimal LOCC estimation procedures is D+2 (D+1) D2 with D denoting the dimension of the relevant quantum system.
AB - We consider the optimal measurement procedures for estimating an unknown maximally entangled state with local operations and classical communications (LOCC). By the "optimal," we mean that there is no other LOCC measurements that can provide a higher estimation fidelity. In fact, we first use the positive partial transpose constraint to obtain an upper bound of the fidelity; then, we show there exists a kind of LOCC measurement that can attain such a bound. The estimation fidelity of the optimal LOCC estimation procedures is D+2 (D+1) D2 with D denoting the dimension of the relevant quantum system.
UR - http://www.scopus.com/inward/record.url?scp=35448978024&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.76.042323
DO - 10.1103/PhysRevA.76.042323
M3 - Article
AN - SCOPUS:35448978024
SN - 1050-2947
VL - 76
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 4
M1 - 042323
ER -