Heisenberg-limited interferometric measurements with quantum correlated photons: influence of decorrelation and photon statistics
نویسندگان
چکیده
The feasibility of a Heisenberg limited phase measurement using a MachZehnder interferometer fed with twin photon correlated light is investigated. To take advantage of the Heisenberg limit, 1/N , for the phase sensitivity, one wants the number of correlated photons, N , to be high. This favors the use of parametric oscillation rather than the weaker but better correlated source given by parametric down-conversion. In real systems, decorrelation arising from photon absorption, mode mismatch, and nonideal detectors must be considered. In this paper we study the influence of partial correlation of the input light and the effect of the photon statistics of the source, and show that it is still possible to break the classical 1/ √ N phase sensitivity limit in nonideal experimental conditions. All the results can be generalized to quantum correlated bosons. PACS number(s): 42.50Dv, 03.75.-b, 03.75.Fi
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