【摘 要】
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Quantum phase measurement with multiphoton twin-Fock states has been shown to be optimal for detecting equal numbers of photons at the output ports of a Mach-Ze
【机 构】
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Key Laboratory of Optical Field Manipulation of Zhejiang Province and Physics Department of Zhejiang
论文部分内容阅读
Quantum phase measurement with multiphoton twin-Fock states has been shown to be optimal for detecting equal numbers of photons at the output ports of a Mach-Zehnder interferometer (i.e.,the so-called single-fringe detection),since the phase sensitivity can saturate the quantum Cramér-Rao lower bound at certain values of phase shift.Here we report a further step to achieve a global phase estimation at the Heisenberg limit by detecting the particle-number difference (i.e.,the (J)z measurement).We show the role of experimental imperfections on the ultimate estimation precision with the six-photon twin-Fock state of light.Our results show that both the precision and the sensing region of the (J)z measurement are better than those of the single-fringe detection,due to combined contributions of the measurement outcomes.We numerically simulate the phase estimation protocol using an asymptotically unbiased maximum likelihood estimator.
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