Heisenberg-limited spin squeezing in coupled spin systems

Huang, Linda; Xuanchen, Zhang,; Wang, Yanzhen; Hua, Zhenxing; Tang, Yuanjiang; Liu, Yong-Chun

doi:10.1103/physreva.107.042613

Cited by 9 publications

(1 citation statement)

References 82 publications

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“…Squeezed spin states (SSSs) possess good properties of reduced spin fluctuations in certain directions, thus having a variety of applications in high-precision measurements and quantum information science. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] Despite squeezed spin states having great properties in reducing projection noise for quantum metrology, in real experiments, the precision we could achieve is still greatly restricted by other various types of noises, including the detection noise. Under certain ranges of detection noise, the metrological gain using squeezed spin states will decrease excessively.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear time-reversal interferometry with arbitrary quadratic collective-spin interaction

Hu 胡,

Li 李,

Zhang 张

et al. 2024

Chinese Phys. B

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Atomic nonlinear interferometry has wide applications in quantum metrology and quantum information science. Here we propose a nonlinear time-reversal interferometry scheme with high robustness and metrological gain based on the spin squeezing generated by arbitrary quadratic collective-spin interaction, which could be described by the Lipkin-Meshkov-Glick (LMG) model. We optimize the squeezing process, encoding process, and anti-squeezing process, finding that the two particular cases of the LMG model, one-axis twisting and two-axis twisting outperform in robustness and precision, respectively. Moreover, we propose a Floquet driving method to realize equivalent time reverse in the atomic system, which leads to high performance in precision, robustness, and operability. Our study sets a benchmark in achieving high precision and robustness in atomic nonlinear interferometry.

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Section: Introductionmentioning

confidence: 99%

Nonlinear time-reversal interferometry with arbitrary quadratic collective-spin interaction

Hu 胡,

Li 李,

Zhang 张

et al. 2024

Chinese Phys. B

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Entanglement-enhanced quantum metrology: From standard quantum limit to Heisenberg limit

Huang,

Zhuang,

Lee

2024

Applied Physics Reviews

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Entanglement-enhanced quantum metrology explores the utilization of quantum entanglement to enhance measurement precision. When particles in a probe are prepared into a suitable quantum entangled state, they may collectively accumulate information about the physical quantity to be measured, leading to an improvement in measurement precision beyond the standard quantum limit and approaching the Heisenberg limit. The rapid advancement of techniques for quantum manipulation and detection has enabled the generation, manipulation, and detection of multi-particle entangled states in synthetic quantum systems such as cold atoms and trapped ions. This article aims to review and illustrate the fundamental principles and experimental progresses that demonstrate multi-particle entanglement for quantum metrology, as well as discuss the potential applications of entanglement-enhanced quantum sensors.

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Transfer of nonclassical correlations between bosonic field and atomic ensemble through electromagnetically induced transparency

Liu,

Ding,

Yin

et al. 2024

Phys. Scr.

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Dark state polariton, as an important concept in the mechanism of electromagnetic induced transparency (EIT), can map the state of bosonic fields to atomic ensembles. To reflect the mapping ability of dark state polariton, we choose the odd and even bosonic coherent states as the probe field in EIT process, and employ spin squeezing, entanglement, and quantum correlation to characterize nonclassical correlations of atomic ensembles during the manipulation of the driving field. It is shown that the differences between the odd and even coherent states are comprehensively reflected in the three characterizations of nonclassical correlations generated through dark state polaritons. The even bosonic coherent states can perfectly transfer bosonic squeezing into atomic ensembles, resulting in spin squeezing. Although the odd bosonic coherent states cannot induce the spin squeezing, they have an advantage over the even bosonic coherent states in generating quantum entanglement and quantum correlations. Furthermore, we demonstrate that atomic ensembles can achieve significant spin squeezing with squeezing degree ∝ 1/N 2/3 through the one-axis twisting (OAT) model and two-axis twisting (TAT) model under the large N limit with the low excitation conditions, and the EIT mechanism was used to transfer the generated spin squeezing to the bosonic field, providing a feasible strategy for obtaining significant bosonic squeezing.

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Heisenberg-limited spin squeezing in coupled spin systems

Cited by 9 publications

References 82 publications

Nonlinear time-reversal interferometry with arbitrary quadratic collective-spin interaction

Nonlinear time-reversal interferometry with arbitrary quadratic collective-spin interaction

Entanglement-enhanced quantum metrology: From standard quantum limit to Heisenberg limit

Transfer of nonclassical correlations between bosonic field and atomic ensemble through electromagnetically induced transparency

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