Abstract
Spin squeezing is a key resource in quantum metrology, allowing improvements of measurement signal-to-noise ratio. Its generation is a challenging task because the experimental realization of the required squeezing interaction remains difficult. Here, we propose a generic scheme to synthesize spin squeezing in non-squeezing systems. By using periodical rotation pulses, the original non-squeezing interaction can be transformed into squeezing interaction, with significantly enhanced interaction strength. The sign of the interaction coefficient is also flippable, facilitating time-reversal readout protocol for nonlinear interferometers. The generated spin squeezing is capable of achieving the Heisenberg limit with measurement precision ∝ 1/N for N particles and its robustness to noises of pulse areas and separations has been verified as well. This work offers a path to extending the scope of Heisenberg-limited quantum precision measurements in non-squeezing systems.
Highlights
Squeezed spin states[1,2,3,4] are such entangled states of collective spins in which the uncertainty of one spin component perpendicular to the mean spin direction is reduced below the standard quantum limit (SQL)
Our scheme is robust to various noises including fluctuations of pulse areas and pulse separations
We carry out the numerical simulation by adding Gaussian stochastic noises, i.e., assuming the fluctuating pulse areas or pulse separations are subject to Gaussian distribution with the standard deviation about five percent of the average value
Summary
Squeezed spin states[1,2,3,4] are such entangled states of collective spins in which the uncertainty of one spin component perpendicular to the mean spin direction is reduced below the standard quantum limit (SQL). Quantum nondemolition (QND) measurement is a feasible method to realize spin squeezing, but the acquired squeezing is not deterministic and is degraded by the performance of the detector[30,31,32,33,34,35,36,37,38,39,40] Another major type of method to deterministically generate spin squeezing is utilizing squeezing interactions, which typically include the one-axis twisting (OAT) and two-axis twisting (TAT) interactions[1,4,41,42,43,44,45,46,47].
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