Experimental demonstration of phase measurement precision beating standard quantum limit by projection measurement

F. W. Sun; B. H. Liu; Y. X. Gong; Y. F. Huang; Z. Y. Ou; G. C. Guo

doi:10.1209/0295-5075/82/24001

Experimental demonstration of phase measurement precision beating standard quantum limit by projection measurement

F. W. Sun
, B. H. Liu
, Y. X. Gong
, Y. F. Huang
, Z. Y. Ou
, G. C. Guo

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

69 Citations (Scopus)

Abstract

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.

Original language	English
Article number	24001
Journal	EPL
Volume	82
Issue number	2
DOIs	https://doi.org/10.1209/0295-5075/82/24001
Publication status	Published - 1 Apr 2008
Externally published	Yes

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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 [email protected].

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title = "Experimental demonstration of phase measurement precision beating standard quantum limit by projection measurement",

abstract = "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. {\textcopyright} Europhysics Letters Association.",

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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 [email protected].

PY - 2008/4/1

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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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DO - 10.1209/0295-5075/82/24001

M3 - RGC 21 - Publication in refereed journal

SN - 0295-5075

VL - 82

JO - EPL

JF - EPL

IS - 2

M1 - 24001

ER -

Experimental demonstration of phase measurement precision beating standard quantum limit by projection measurement

Abstract

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