4.6 Article

Driven quadrature and spin squeezing in a cavity-coupled ensemble of two-level states

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PHYSICAL REVIEW A
卷 103, 期 2, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.103.023701

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  1. Villum Foundation [17524]

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This study theoretically explores the magnitude of quadrature squeezing in a cavity-coupled ensemble driven by a coherent off-axis field. Numerical calculations show that steady-state quadrature squeezing approaches a limit of -3 dB, while frequency-modulated quadrature squeezing approaches a limit of -14 dB, in different conditions. The impact of pure dephasing can be mitigated by increasing the detuning of the driving field, and frequency-modulated squeezing is only shielded under specific conditions.
The generated magnitude of quadrature squeezing in a cavity-coupled ensemble, which is continuously driven using a coherent off-axis field, is theoretically explored. Using a truncated set of equations of motion derived from a Dicke Hamiltonian, steady-state quadrature squeezing of the cavity field is numerically calculated to approach a limit of -3 dB, while frequency-modulated quadrature squeezing approaches a limit of -14 dB, in the absence of pure dephasing and as a function of the ensemble's size and detuning. The impact of pure dephasing on steady-state quadrature squeezing is shown to be mitigated by increased detuning of the driving field, while frequency-modulated squeezing is only shielded in a regime where the cumulative coupling and driving rates are in excess of the pure-dephasing rate. Spin-squeezed entanglement is also calculated to occur simultaneously with weakly driven frequency-modulated quadrature squeezing.

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