Quantum correlations between each qubit in a two-atom system and the environment in terms of interatomic distance

Berrada, K.; Fanchini, Felipe F.; Abdel‐Khalek, S.

doi:10.1103/physreva.85.052315

Cited by 74 publications

(20 citation statements)

References 33 publications

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“…It is a nonlocal correlation between distinct quantum systems, which has been refereed Schrödinger in his 1935 discussion of the issues raised by the paradox of Einstein, Podolsky, and Rosen [27,28] as the characteristic trait of quantum mechanics, the one that enforces its entire departure from classical lines of thought [28]. Entanglement lies at the heart of many problems in quantum mechanics and has attracted an increasing attention in recent years and led to development of different branches of physics [29][30][31][32][33][34][35][36]. Actually, it has emerged as a major resource for realizing several quantum protocol in several quantum information processing tasks such as teleportation and certain quantum cryptographic protocols.…”

Section: Introductionmentioning

confidence: 99%

Effect of the time-dependent coupling on a superconducting qubit-field system under decoherence: Entanglement and Wehrl entropy

2015

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Section: Introductionmentioning

confidence: 99%

Effect of the time-dependent coupling on a superconducting qubit-field system under decoherence: Entanglement and Wehrl entropy

2015

Self Cite

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“…A similar analysis can be derived for the initial states |Φ(β) = √ β |00 + √ 1 − β |11 . Thus, the 'detrimental' behaviour of the system's correlations δ ← AB and E AB reported in [43] is actually explained because such β states are not, in general, 'naturally' supported by the system's Hamiltonian since they are not eigenstates of…”

Section: Resultsmentioning

confidence: 99%

Extracting Information from Qubit-Environment Correlations

Reina

Susa

Fanchini

2014

Sci Rep

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Most works on open quantum systems generally focus on the reduced physical system by tracing out the environment degrees of freedom. Here we show that the qubit distributions with the environment are essential for a thorough analysis, and demonstrate that the way that quantum correlations are distributed in a quantum register is constrained by the way in which each subsystem gets correlated with the environment. For a two-qubit system coupled to a common dissipative environment , we show how to optimise interqubit correlations and entanglement via a quantification of the qubit-environment information flow, in a process that, perhaps surprisingly, does not rely on the knowledge of the state of the environment. To illustrate our findings, we consider an optically-driven bipartite interacting qubit AB system under the action of . By tailoring the light-matter interaction, a relationship between the qubits early stage disentanglement and the qubit-environment entanglement distribution is found. We also show that, under suitable initial conditions, the qubits energy asymmetry allows the identification of physical scenarios whereby qubit-qubit entanglement minima coincide with the extrema of the and entanglement oscillations.

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“…In the case of two-qubit [25,26] mixed state defined in eq. (10), an analytical solution was developed by Wootters in terms of concurrence [27] and the concurrence is given by…”

Section: Concurrence and Negativitymentioning

confidence: 99%

Dynamical properties of moving atom–atom entanglement and entanglement between two atoms with optical field

Abdel‐Khalek

Halawani

2015

Pramana - J Phys

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Quantum information technology largely relies on a sophisticated and fragile resource, called quantum entanglement, which exhibits a highly nontrivial manifestation of the coherent superposition of the states of composite quantum systems. In this paper, we study the interaction between the general and even coherent fields with moving and stationary two two-level atoms. In this regard, this paper investigates the von Neumann entropy and the atoms-field tangle as a measure of entanglement between the general and even coherent fields with the two atoms. Also, the entanglement between the two atoms using concurrence and negativity during time evolution is discussed. This paper examines the effects of multiphoton transitions and initial state setting on the entanglement for the system under consideration. Finally, the results demonstrate an important phenomenon such as the sudden death and birth of entanglement when the two atoms are initially in entangled states.Keywords. von Neumann entropy; concurrence; negativity; atoms-field tangle; sudden death and sudden birth of entanglement.

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Quantum correlations between each qubit in a two-atom system and the environment in terms of interatomic distance

Cited by 74 publications

References 33 publications

Effect of the time-dependent coupling on a superconducting qubit-field system under decoherence: Entanglement and Wehrl entropy

Effect of the time-dependent coupling on a superconducting qubit-field system under decoherence: Entanglement and Wehrl entropy

Extracting Information from Qubit-Environment Correlations

Dynamical properties of moving atom–atom entanglement and entanglement between two atoms with optical field

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