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Bulletin of the American Physical Society

Enhancing spin squeezing using weak measurement

Mingfeng Wang, Weizhi Qu, Pengxiong Li, Han Bao, Yanhong Xiao

Published Jun 10, 2015• 0 citations
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arXiv:1812.11548•Dec 30, 2018•0 citations
Abstract We propose an efficient method to protect spin squeezing under the action of amplitude-damping, depolarizing and phase-damping channels based on measurement reversal from weak measurement, and consider an ensemble of N independent spin-1/2 particles with exchange symmetry. We show that spin squeezing can be enhanced greatly under three different decoherence channels and spin-squeezing sudden death can be avoided undergoing amplitude-damping and phase-damping channels. Moreover, we find that the spin-squeezing parameters can be completely recovered to its initial value under amplitude-damping channel by changing weak measurement strength irrespective of sufficiently strong decoherence. For the phase-damping channel, the spin-squeezing parameter can be recovered to a certain stationary value in certain conditions. Our results provide an active way to suppress decoherence and enhance the spin squeezing under decoherence, which is rather significant for quantum metrology in open systems.
A weak measurement approach is proposed to entangle and squeeze atoms. We show that even for very small coupling strength between light and atoms, one can achieve large squeezing unattainable with normal measurement-based squeezing. Post-selecting the photons interacting with spins via a weak off-resonant quantum nondemolition interaction (QND) in a state nearly orthogonal to its initial state can strengthen the entanglement among elementary spins and thus enhance spin squeezing. The squeezing process is probabilistic but the created state is unconditionally determined. Further control of the post-selection parameter and the detection process can transform the QND-like spin squeezing into the one-axis-twisting or even two-axis-twisting type.