TY - JOUR
T1 - Experimental demonstration of phase measurement precision beating standard quantum limit by projection measurement
AU - Sun, F. W.
AU - Liu, B. H.
AU - Gong, Y. X.
AU - Huang, Y. F.
AU - Ou, Z. Y.
AU - Guo, G. C.
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.
PY - 2008/4/1
Y1 - 2008/4/1
N2 - We propose and demonstrate experimentally a projection scheme to measure the quantum phase with a precision beating the standard quantum limit. The initial input state is a twin Fock state |N,N〉 proposed by Holland and Burnett (Phys. Rev. Lett., 71 (1993) 1355) but the phase information is extracted by a quantum state projection measurement. The phase precision is about 1.4/N for large photon number N, which approaches the Heisenberg limit of 1/N. Experimentally, we employ a four-photon state from type-II parametric down-conversion and achieve a phase uncertainty of 0.2910.001 beating the standard quantum limit of for four photons. © Europhysics Letters Association.
AB - We propose and demonstrate experimentally a projection scheme to measure the quantum phase with a precision beating the standard quantum limit. The initial input state is a twin Fock state |N,N〉 proposed by Holland and Burnett (Phys. Rev. Lett., 71 (1993) 1355) but the phase information is extracted by a quantum state projection measurement. The phase precision is about 1.4/N for large photon number N, which approaches the Heisenberg limit of 1/N. Experimentally, we employ a four-photon state from type-II parametric down-conversion and achieve a phase uncertainty of 0.2910.001 beating the standard quantum limit of for four photons. © Europhysics Letters Association.
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U2 - 10.1209/0295-5075/82/24001
DO - 10.1209/0295-5075/82/24001
M3 - 21_Publication in refereed journal
VL - 82
JO - Europhysics Letters
JF - Europhysics Letters
SN - 0295-5075
IS - 2
M1 - 24001
ER -