Quantum metrology with one auxiliary particle in a correlated bath and its quantum simulation

He, Wenjie; Guang, Huan-Yu; Li, Ziyun; Deng, Ru-Qiong; Zhang, Nana; Zhao, Jie-Xing; Deng, Fu‐Guo; Ai, Qing

doi:10.1103/physreva.104.062429

Cited by 10 publications

(3 citation statements)

References 62 publications

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“…[3] Among various multiquanta system, n-phonon system [4] has attached much attention due to the potential application in quantum information, metrology and studies of fundamental physics. [5][6][7][8][9][10][11][12][13][14][15][16] At the same time, acoustic waves are immune to radiation losses into the vacuum because of they can only propagate in a medium. Thus, the acoustic waves become strong candidates for the engineering of solid-state quantum devices and on-chip quantum communications.…”

Section: Introductionmentioning

confidence: 99%

Multiphonon Bundle Emission in a Strong‐Coupling Cavity Optomechanical System

Deng

Lan

et al. 2023

Annalen der Physik

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Nonclassical effects in mesoscopic systems have attracted much attention recently. In this paper, it is shown that multiphonon bundle emission can be observed in a strong-coupling cavity optomechanical system. Theoretical analysis shows that when the driving field is adjusted to nth-order sideband excitation, the coupling between the cavity mode and the vibrational mode leads to super-Rabi oscillations, and finally results in an n-phonon bundles emission. Based on the current technology, this process can work in a wide range of parameters. Numerical simulation confirms the validity of the derivation. It is thought that this physical mechanism broadens the applications of cavity optomechanical system in realm of quantum phononics, such as in quantum metrology and phonon laser.

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Section: Introductionmentioning

confidence: 99%

Multiphonon Bundle Emission in a Strong‐Coupling Cavity Optomechanical System

Deng

Lan

et al. 2023

Annalen der Physik

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“…Specifically, in the limiting case where the N qubit sensors couple linearly and collectively to a bosonic environment, superclassical precision scaling failed to be reached by using entangled probes prepared in an experimentally accessible one-axis twisted state (OATS), with the bath-induced entanglement resulting in an exponential increase of the uncertainty away from the optimal measurement time. Interestingly, a strategy for leveraging the spatially correlated nature of the noise and restore a quantum advantage in this same bosonic setting was recently proposed in [37], based on the use of an auxiliary qubit as a means for detecting and effectively undoing decoherence of the N qubit probes. While such an approach is ideally suited for an initial GHZ state (and other states supported on a two-dimensional subspace), it does not extend in scalable form to other entangled states of practical relevance, such as spin squeezed states.…”

Section: Introductionmentioning

confidence: 99%

Frequency estimation under non-Markovian spatially correlated quantum noise

et al. 2022

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We study the estimation precision attainable by entanglement-enhanced Ramsey interferometry in the presence of spatiotemporally correlated non-classical noise. Our analysis relies on an exact expression of the reduced density matrix of the qubit probes under general zero-mean Gaussian stationary dephasing, which is established through cumulant-expansion techniques and may be of independent interest in the context of non-Markovian open dynamics. By continuing and expanding our previous work [Beaudoin et al., Phys. Rev. A 98, 020102(R) (2018)], we analyze the effects of a non-collective coupling regime between the qubit probes and their environment, focusing on two limiting scenarios where the couplings may take only two or a continuum of possible values. In the paradigmatic case of spin-boson dephasing noise from a thermal environment, we find that it is in principle possible to suppress, on average, the effect of spatial correlations by randomizing the location of the probes, as long as enough configurations are sampled where noise correlations are negative. As a result, superclassical precision scaling is asymptotically restored for initial entangled states, including experimentally accessible one-axis spin-squeezed states.

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“…When the system interacts with a specific bath with a band structure, ideal precision may be retrieved as a result of the existence of the bound state [9,10]. When there is a correlation between the baths for individual qubits, an auxiliary qubit can be introduced to reach the Heisenberg limit [11][12][13]. Interestingly, the nonlinear interaction between the system and the physical quantity to be measured is used to surpass the Heisenberg limit [14][15][16][17][18].…”

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confidence: 99%

Entanglement-Enhanced Quantum Metrology in Colored Noise by Quantum Zeno Effect

Long

Zhang

et al. 2022

Phys. Rev. Lett.

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In open quantum systems, the precision of metrology inevitably suffers from the noise. In Markovian open quantum dynamics, the precision can not be improved by using entangled probes although the measurement time is effectively shortened. However, it was predicted over one decade ago that in a non-Markovian one, the error can be significantly reduced by the quantum Zeno effect (QZE) [Chin, Huelga, and Plenio, Phys. Rev. Lett. 109, 233601 (2012)]. In this work, we apply a recently-developed quantum simulation approach to experimentally verify that entangled probes can improve the precision of metrology by the QZE. Up to n = 7 qubits, we demonstrate that the precision has been improved by a factor of n 1/4 , which is consistent with the theoretical prediction. Our quantum simulation approach may provide an intriguing platform for experimental verification of various quantum metrology schemes.

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Quantum metrology with one auxiliary particle in a correlated bath and its quantum simulation

Cited by 10 publications

References 62 publications

Multiphonon Bundle Emission in a Strong‐Coupling Cavity Optomechanical System

Multiphonon Bundle Emission in a Strong‐Coupling Cavity Optomechanical System

Frequency estimation under non-Markovian spatially correlated quantum noise

Entanglement-Enhanced Quantum Metrology in Colored Noise by Quantum Zeno Effect

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