Entanglement and discord: Accelerated observations of local and global modes

Doukas, Jason; Brown, Eric G.; Dragan, Andrzej; Mann, Robert B.

doi:10.1103/physreva.87.012306

Cited by 69 publications

(80 citation statements)

References 37 publications

(61 reference statements)

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“…This is very surprising considering how quickly any extractable entanglement vanishes with increasing temperature. It is known that discord tends to be more robust to decoherence than entanglement [36][37][38][39][40], but what we have found in this scenario is instead a complete reversal of behavior between the two measures.…”

Section: Resultscontrasting

confidence: 66%

Thermal amplification of field-correlation harvesting

Brown¹

2013

Phys. Rev. A

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We study the harvesting of quantum and classical correlations from a hot scalar field in a periodic cavity by a pair of spatially separated oscillator-detectors. Specifically, we utilize non-perturbative and exact (non-numerical) techniques to solve for the evolution of the detectors-field system and then we examine how the entanglement, Gaussian quantum discord, and mutual information obtained by the detectors change with the temperature of the field. While (as expected) the harvested entanglement rapidly decays to zero as temperature is increased, we find remarFkably that both the mutual information and the discord can actually be increased by multiple orders of magnitude via increasing the temperature. We go on to explain this phenomenon by a variety of means, and are able to make accurate predictions of the behavior of thermal amplification. By doing this we also introduce a new perspective on harvesting in general and illustrate that the system can be represented as two dynamically decoupled systems, each with only a single detector. The thermal amplification of discord harvesting represents an exciting prospect for discord-based quantum computation, including its use in entanglement activation.

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Section: Resultscontrasting

confidence: 66%

Thermal amplification of field-correlation harvesting

Brown¹

2013

Phys. Rev. A

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“…Another key progress that has been made in the field of relativistic quantum information in recent times, is the introduction and use of localized modes for Alice and the accelerated observer, here the detector, Rob [77,78]. The principle behind the degradation of quantum correlations emerged to be due to the mode mismatch between what was received and what could be observed by the accelerated detector.…”

Section: Jhep02(2017)082mentioning

confidence: 99%

Characterization of Unruh channel in the context of open quantum systems

Banerjee

Alok

Omkar

et al. 2017

J. High Energ. Phys.

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Abstract:In this work, we study an important facet of field theories in curved spacetime, viz. the Unruh effect, by making use of ideas of statistical mechanics and quantum foundations. Aspects of decoherence and dissipation, natural artifacts of open quantum systems, along with foundational issues such as the trade-off between coherence and mixing as well as various aspects of quantum correlations are investigated in detail for the Unruh effect. We show how the Unruh effect can be quantified mathematically by the Choi matrix approach. We study how environmentally induced decoherence modifies the effect of the Unruh channel. The differing effects of a dissipative or non-dissipative environment are noted. Further, useful parameters characterizing channel performance such as gate and channel fidelity are applied here to the Unruh channel, both with and without external influences. Squeezing, which is known to play an important role in the context of particle creation, is shown to be a useful resource in a number of scenarios.

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“…On the other hand, relativistic quantum information [20][21][22][23][24][25][26][27][28][29][30][31][32][33], the study of quantum information processes and concepts in a relativistic setting, has been a blooming area of research for both conceptual and experimental reasons. Understanding quantum phenomena in a relativistic framework is necessary because the realistic quantum systems are essentially nonin-ertial.…”

Section: Introductionmentioning

confidence: 99%

Gaussian quantum steering and its asymmetry in curved spacetime

et al. 2016

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We study Gaussian quantum steering and its asymmetry in the background of a Schwarzschild black hole. We present a Gaussian channel description of quantum state evolution under the influence of the Hawking radiation. We find that thermal noise introduced by Hawking effect will destroy the steerability between an inertial observer Alice and an accelerated observer Bob who hovers outside the event horizon, while it generates steerability between Bob and a hypothetical observer anti-Bob inside the event horizon. Unlike entanglement behaviors in curved spacetime, here the steering from Alice to Bob suffers from a "sudden death" and the steering from anti-Bob to Bob experiences a "sudden birth" with increasing Hawking temperature. We also find that the Gaussian steering is always asymmetric and the maximum steering asymmetry cannot exceed ln 2, which means the state never evolves to an extremal asymmetry state. Furthermore, we obtain the parameter settings that maximize steering asymmetry and find that (i) s = arccosh() is the critical point of steering asymmetry, and (ii) the attainment of maximal steering asymmetry indicates the transition between one-way steerability and both-way steerability for the two-mode Gaussian state under the influence of Hawking radiation.

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Entanglement and discord: Accelerated observations of local and global modes

Cited by 69 publications

References 37 publications

Thermal amplification of field-correlation harvesting

Thermal amplification of field-correlation harvesting

Characterization of Unruh channel in the context of open quantum systems

Gaussian quantum steering and its asymmetry in curved spacetime

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