Minimizing Backaction through Entangled Measurements

Wu, Kang-Da; Bäumer, Elisa; Tang, Jun-Feng; Hovhannisyan, Karen V.; Perarnau-Llobet, Martí; Xiang, Guo-Yong; Li, Chuan‐Feng; Guo, Guang‐Can

doi:10.1103/physrevlett.125.210401

Cited by 19 publications

(9 citation statements)

References 74 publications

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“…Experimental results also show that such technologies can be used to reduce the backaction of projective measurements in quantum thermodynamics. [ 114,115 ]…”

Section: Experimental Progress On the Resource Theory Of Quantum Coherencementioning

confidence: 99%

Experimental Progress on Quantum Coherence: Detection, Quantification, and Manipulation

Streltsov

Regula

et al. 2021

Adv Quantum Tech

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Quantum coherence is a fundamental property of quantum systems, separating quantum from classical physics. Recently, there has been significant interest in the characterization of quantum coherence as a resource, investigating how coherence can be extracted and used for quantum technological applications. In this work, the progress of this research is reviewed, focusing in particular on recent experimental efforts. After a brief review of the underlying theory, the main platforms for realizing the experiments are discussed: linear optics, nuclear magnetic resonance, and superconducting systems. Experimental detection and quantification of coherence, experimental state conversion and coherence distillation, and experiments investigating the dynamics of quantum coherence are then considered. Experiments exploring the connections between coherence and uncertainty relations, path information, and coherence of operations and measurements are also reviewed. Experimental efforts on multipartite and multilevel coherence are also discussed.

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“…Experimental results also show that such technologies can be used to reduce the backaction of projective measurements in quantum thermodynamics. [ 114,115 ]…”

Section: Experimental Progress On the Resource Theory Of Quantum Coherencementioning

confidence: 99%

Experimental Progress on Quantum Coherence: Detection, Quantification, and Manipulation

Streltsov

Regula

et al. 2021

Adv Quantum Tech

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show abstract

“…[112], the authors apply collective measurements to optimal orienteering protocols based on parallel spins and antiparallel spins. Experimental results also show that such technologies can be used to reduce the backaction of projective measurements in quantum thermodynamics [113,114].…”

Section: A Experimental Detection and Quantification Of Coherencementioning

confidence: 94%

Experimental progress on quantum coherence: detection, quantification, and manipulation

Wu,

Streltsov,

Regula

et al. 2021

Preprint

Self Cite

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Quantum coherence is a fundamental property of quantum systems, separating quantum from classical physics. Recently, there has been significant interest in the characterization of quantum coherence as a resource, investigating how coherence can be extracted and used for quantum technological applications. In this work we review the progress of this research, focusing in particular on recent experimental efforts. After a brief review of the underlying theory we discuss the main platforms for realizing the experiments: linear optics, nuclear magnetic resonance, and superconducting systems. We then consider experimental detection and quantification of coherence, experimental state conversion and coherence distillation, and experiments investigating the dynamics of quantum coherence. We also review experiments exploring the connections between coherence and uncertainty relations, path information, and coherence of operations and measurements. Experimental efforts on multipartite and multilevel coherence are also discussed.

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“…See detailed calculation in App. C. Obviously, if the initial state ρ 0 is an eigenstate of A, i.e., ρ 0 = |a i a i |, then ρ 1 = ρ 0 , which implies that system S will not be disturbed after the first measurement [12]. In general, however, system S is disturbed through the first measurement and thus ρ 1 = ρ 0 .…”

Section: A Joint Measurement Model (Prediction)mentioning

confidence: 99%

“…The QBA of prediction is defined by the disturbance caused by prior measurements affecting subsequent measurements, whereas the QBA of retrodiction is expressed through the disturbance caused by the subsequent measurements affecting the prior measurements. The former has been widely being discussed and explored recently, which include sequential weak measurements [5][6][7][8][9], reducing the QBA effect [10][11][12][13], and manipulating qubits [14]. The concepts * Electronic address: binho@riec.tohoku.ac.jp of violating noncontextual realism [15] and the maximal extracting knowledge [16] through sequential measurements are also worth mentioning in this context.…”

Section: Introduction and Preliminary Definitionsmentioning

confidence: 99%

Quantum uncertainties in sequential measurements under prediction and retrodiction

Ho¹

2022

Preprint

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In sequential measurements, we consider the prediction is as an inference of the subsequent observational data from the prior measurements, while the retrodiction is as an inference of the prior observational data from the subsequent measurements. We theoretically study the impact of the quantum backaction (QBA) in the sequential measurements on the inferred observational data from the prediction and retrodiction. The QBA of the prediction behaves like the disturbance caused by prior measurements affecting subsequent measurements, whereas the QBA of the retrodiction behaves through the disturbance caused by the subsequent measurements affecting the prior measurements. In particular, we consider the sequential measurements of two observables A and B, one after another, i.e., A first and B later, and then we theoretically formulate the quantum uncertainties in the value of these observables (for both prediction and retrodiction) as figures of merit for the disturbances. These results are illustrated in spin systems, where we present the dependence of the uncertainty in subsequent measurement on the prior measurement and vice versa. We further find a hint for beyond the stronger uncertainty relation. The work is finally extended to N -sequential measurements.

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Minimizing Backaction through Entangled Measurements

Cited by 19 publications

References 74 publications

Experimental Progress on Quantum Coherence: Detection, Quantification, and Manipulation

Experimental Progress on Quantum Coherence: Detection, Quantification, and Manipulation

Experimental progress on quantum coherence: detection, quantification, and manipulation

Quantum uncertainties in sequential measurements under prediction and retrodiction

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