Characterization of Unruh channel in the context of open quantum systems

Banerjee, Subhashish; Alok, Ashutosh Kumar; Omkar, S.; Srikanth, R.

doi:10.1007/jhep02(2017)082

Cited by 19 publications

(15 citation statements)

References 102 publications

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“…The presence of quantum coherence prompts the emergence of many intriguing properties of the quantum system. Quantum coherence and quantum correlations as a resource play a pivotal role in wide range of fields; quantum information processing, quantum metrology, and quantum thermodynamics [14][15][16][17][18][19][20][21][22]. In the literature, two different approaches have been proposed to quantify coherence; viz.…”

Section: Introductionmentioning

confidence: 99%

Quantum speed limit time: role of coherence as a dynamical witness to distinguish multi-qubit entangled states

G.¹,

Banerjee²

2022

Preprint

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The minimum evolution time between multi-qubit quantum states is estimated for non-Markovian quantum channels. We consider the maximally coherent pure and mixed states as well as multi-qubit X states as initial states and discuss the impacts of initial coherence on their speed of evolution for both dephasing and dissipative processes. The role of the non-zero value of initial coherence under information backflow conditions for the dissipative process is revealed by the flow of quantum speed limit time. The trade-off between mixedness and coherence on the speed limit time reveals the nature of the quantum process the states undergo. The complementarity effect between mixedness and coherence is more prominent in the quantum dissipation process. The parametric trajectory of speed limit time vividly depicts the difference in the evolution of pure and mixed initial states. Our investigation of quantum speed limit time on multi-qubit entangled X states reveals that τQSL can be identified as a potential dynamical witness to distinguish multi-qubit states in the course of evolution.I.

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Section: Introductionmentioning

confidence: 99%

Quantum speed limit time: role of coherence as a dynamical witness to distinguish multi-qubit entangled states

G.¹,

Banerjee²

2022

Preprint

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“…Gate fidelity [35], which tell us about the efficiency of the gate's performance and channel fidelity [24], which is a measure of how well a gate preserves the distinguishability of states, and is thus connected to the Holevo bound of the channel, are two useful channel performance parameters. The performance of Lindbladian channels, such as the squeezed generalized amplitude damping (SGAD) channel [36] and the Unruh channel [37] have been studied using these parameters [24]. Here, these are used to characterize the two non-Markovian channels, RTN [38][39][40] and NMD [41].…”

Section: Introductionmentioning

confidence: 99%

Facets of quantum information under non-Markovian evolution

2019

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We consider two non-Markovian models: Random Telegraph Noise (RTN) and non-Markovian dephasing (NMD). The memory in these models is studied from the perspective of quantum Fisher information flow. This is found to be consistent with the other well known witnesses of non-Markovianity. The two noise channels are characterized quantum information theoretically by studying their gate and channel fidelities. Further, the quantum coherence and its balance with mixedness is studied. This helps to put in perspective the role that the two noise channels can play in various facets of quantum information processing and quantum communication.

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“…[2] The relativistic effect on quantum dynamics in acceleration frames [3] and vacuum fluctuation in black hole spacetimes [4] have been studied in the field of relativistic quantum information. [5] As is well known, Unruh acceleration effects [6,7] and gravitational fields [8,9] lead to information loss of particles or antiparticles in a relativistic framework. Recent studies have demonstrated that the geometric inflation and shadows have impacts on the nonclassicality of quasibound states of black holes.…”

Section: Introductionmentioning

confidence: 99%

Decoherence of Dirac‐Quantumness for Open Particles in a Dilatonic Black Hole

Yao

Yan

et al. 2021

Annalen der Physik

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The quantumness of Dirac particles for quantized fields in a dilatonic black hole is estimated by means of quantum channel. A general Bloch vector representation of quantum channel in black hole spacetimes beyond single mode approximation is developed. The nonclassicality of Dirac particles can be measured by the minimization of quantum coherence over all orthonormal basis sets. The quantumness of the channel decreases as the dilaton field increases. The interplay between the external reservoir noise and dilaton black hole on the dynamical behavior of quantum coherence and steerability is investigated in the Pauli basis. The external environment is modeled by a random telegraph noise channel. The monotonous decay of quantum nonlocality occurs in the weak coupling case. The degradation and revival of quantum nonlocality are observed in the strong coupling condition. It is found that quantum fluctuation effects of the external reservoir can protect quantum coherence and steerability from the information loss of the black hole.

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Characterization of Unruh channel in the context of open quantum systems

Cited by 19 publications

References 102 publications

Quantum speed limit time: role of coherence as a dynamical witness to distinguish multi-qubit entangled states

Quantum speed limit time: role of coherence as a dynamical witness to distinguish multi-qubit entangled states

Facets of quantum information under non-Markovian evolution

Decoherence of Dirac‐Quantumness for Open Particles in a Dilatonic Black Hole

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