Generic two-mode Gaussian states as quantum sensors

IF 5 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Pritam Chattopadhyay, Saikat Sur and Jonas F G Santos
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引用次数: 0

Abstract

Gaussian quantum channels constitute a cornerstone of continuous-variable quantum information science, underpinning a wide array of protocols in quantum optics and quantum metrology. While the action of such channels on arbitrary states is well-characterized under full channel knowledge, we address the inverse problem, namely, the precise estimation of fundamental channel parameters, including the beam splitter transmissivity and the two-mode squeezing amplitude. Employing the quantum Fisher information (QFI) as a benchmark for metrological sensitivity, we demonstrate that the symmetry inherent in mode mixing critically governs the amplification of QFI, thereby enabling high-precision parameter estimation. In addition, we investigate quantum thermometry by estimating the average photon number of thermal states, revealing that the transmissivity parameter significantly modulates estimation precision. Our results underscore the metrological utility of two-mode Gaussian states and establish a robust framework for parameter inference in noisy and dynamically evolving quantum systems.
通用双模高斯态作为量子传感器
高斯量子通道是连续变量量子信息科学的基石,是量子光学和量子计量学中广泛协议的基础。虽然在全信道知识下,这些信道对任意态的作用得到了很好的表征,但我们解决了反问题,即精确估计基本信道参数,包括分束器透射率和双模压缩幅度。采用量子费雪信息(QFI)作为计量灵敏度的基准,我们证明了模式混合中固有的对称性关键地控制了QFI的放大,从而实现了高精度的参数估计。此外,我们通过估计热态的平均光子数来研究量子测温,揭示透射率参数显着调节估计精度。我们的研究结果强调了双模高斯态的计量效用,并为噪声和动态演化量子系统中的参数推理建立了一个鲁棒框架。
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来源期刊
Quantum Science and Technology
Quantum Science and Technology Materials Science-Materials Science (miscellaneous)
CiteScore
11.20
自引率
3.00%
发文量
133
期刊介绍: Driven by advances in technology and experimental capability, the last decade has seen the emergence of quantum technology: a new praxis for controlling the quantum world. It is now possible to engineer complex, multi-component systems that merge the once distinct fields of quantum optics and condensed matter physics. Quantum Science and Technology is a new multidisciplinary, electronic-only journal, devoted to publishing research of the highest quality and impact covering theoretical and experimental advances in the fundamental science and application of all quantum-enabled technologies.
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