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

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dc.creatorSun, F. W.
dc.creatorLiu, B. H.
dc.creatorGong, Y. X.
dc.creatorHuang, Y. F.
dc.creatorOu, Z. Y.
dc.creatorGuo, G. C.
dc.date2007-10-15
dc.date.accessioned2026-07-07T09:28:34Z
dc.date.available2026-07-07T09:28:34Z
dc.descriptionWe 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. {\bf 71}, 1355 (1993)] 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 $0.291\pm 0.001$ beating the standard quantum limit of $1/\sqrt{N} = 1/2$ for four photons.
dc.description5 figures
dc.identifierhttps://arxiv.org/abs/0710.2922
dc.identifierhttp://arxiv.org/abs/0710.2922
dc.identifierEPL, 82 (2008) 24001
dc.identifierdoi:10.1209/0295-5075/82/24001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/157472
dc.subjectQuantum Physics
dc.titleExperimental demonstration of phase measurement precision beating standard quantum limit by projection measurement
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