Coherence of operations and interferometry

Masini, Michele; Theurer, Thomas; Plenio, Martin B.

doi:10.1103/physreva.103.042426

Cited by 16 publications

(13 citation statements)

References 68 publications

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“…We note that in metrological tasks, nonclassicality rather than entanglement is a necessary resource to achieve quantum advantages [28,29]. As a particular nonclassicality which is more general than entanglement, quantum coherence is intimately related to the quantum Fisher information (QFI) [30,31], a key quantity bounding the ultimate precision of the estimation of a parameter encoded in a quantum state 1 . Therefore, motivated by the close relation between the QFI and quantum coherence, we will evaluate the QFI for the two-UDW detectors, with Unruh temperature as a parameter chosen to be optimally estimated.…”

Section: Introductionmentioning

confidence: 99%

Coherence revival and metrological advantage for moving Unruh-DeWitt detector

Feng

Wang²,

Li³

2021

Preprint

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In this paper, we investigate the quantum coherence extraction for two accelerating Unruh-DeWitt detectors coupling to a scalar background in 3 + 1 Minkowski spacetime. We find that quantum coherence as a sort of nonclassical correlation can be generated through the Markovian evolution of the detectors system just like quantum entanglement. However, with growing Unruh temperature, in contrast to monotonous degrading entanglement, we find that quantum coherence exhibits a striking revival phenomenon. That is, for certain choice of detectors' initial state, coherence measure will reduce to zero firstly then grow up to an asymptotic value. We verify such coherence revival by inspecting its metrological advantage on enhancing the quantum Fisher information (QFI). Since the maximal QFI bounding the accuracy of a quantum measurement, we conclude that the extracted coherence can be utilized as a physical resource in quantum metrology.

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Section: Introductionmentioning

confidence: 99%

Coherence revival and metrological advantage for moving Unruh-DeWitt detector

Feng

Wang²,

Li³

2021

Preprint

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“…We hope that the analysis presented in this paper helps discerning distinct phenomena which result from different types of coherence [27]. Insight into different types of coherence, potentially of different order, might be beneficial for both fundamental quantum optical investigations [39][40][41][42] as as technological applications [43,44].…”

Section: Discussionmentioning

confidence: 99%

Different Types of Coherence: Young-type Interference versus Dicke Superradiance

Bhatti,

Bojer,

von Zanthier

2021

Preprint

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Dicke superradiance, i.e., the enhanced spontaneous emission of coherent radiation, is often attributed to radiation emitted by synchronized dipoles coherently oscillating in phase. At the same time, Dicke derived superradiance assuming atoms in entangled Dicke states which do not display any dipole moment. To shed light on this apparent paradox, we study the intensity distribution arising from two identical two-level atoms prepared either in an entangled Dicke state or in a separable atomic state with non-vanishing dipole moment. We find that the two configurations produce similar far field intensity patterns, however, stemming from fundamentally distinct types of coherence: while in the second case the atoms display coherence among the individual particles leading to Young-type interference as known from classical dipoles, atoms in Dicke states possess collective coherence leading to enhanced spontaneous emission. This demonstrates that the radiation generated by synchronized dipoles and Dicke superradiance are fundamentally distinct phenomena and have to be interpreted in different ways.

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“…Dynamical systems carry higher dimensional information, which implies that quantum features in quantum chan- * ycs@dlut.edu.cn nels can also be taken regard as resources. Therefore, the dynamical QRT [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63]could also been established similar to but quite different from the QRT in static systems. Ref.…”

Section: Introductionmentioning

confidence: 92%

Quantifying Dynamical Total Coherence in a Resource Non-increasing Framework

Yang¹,

Yu²

2021

Preprint

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We quantify the dynamical quantum resource in the resource non-increasing (RNI) framework, namely, the free dynamical resource is defined by the channels that cannot increase the static "resourcefulness" of any input state. We present two kinds of approaches to quantifying the dynamical resource, the distance measures and the maximal increasing static resource (MISR). As a demonstration, we quantify the dynamical total coherence with our presented measures. It is shown that the distance based measures have good operational interpretation through quantum processing tasks and can be numerically calculated by semidefinite programming (SDP) and the measures based on MISR could lead to the analytical solution. As an application, we consider the dynamical total coherence of the qubit amplitude damping channel. Both the analytical measure based on the static l 2 norm and the numerical illustrations based on the SDP are given.

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Coherence of operations and interferometry

Cited by 16 publications

References 68 publications

Coherence revival and metrological advantage for moving Unruh-DeWitt detector

Coherence revival and metrological advantage for moving Unruh-DeWitt detector

Different Types of Coherence: Young-type Interference versus Dicke Superradiance

Quantifying Dynamical Total Coherence in a Resource Non-increasing Framework

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