System–environment correlations and non-Markovian dynamics

Pernice, A.; Helm, Julius; Strunz, Walter T.

doi:10.1088/0953-4075/45/15/154005

Cited by 42 publications

(46 citation statements)

References 50 publications

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“…This behavior explains the observed buildup of the quasi-equilibrium in liquid crystals. The results of this work, together with the conclusions obtained in references 11,13 , can contribute to elucidate the underlying quantum mechanisms for decoherence of open quantum systems of interacting spins, for instance the role played by quantum correlations between the observed system and the environment in the damping of the spin coherences 25,26 . Certainly, these works showed that in liquid crystals it is essential to assume the quantum character of the spin-environment coupling to explain the observed irreversible decoherence.…”

Section: Discussionmentioning

confidence: 62%

“…Also, understanding the nature of the decoherence mechanism can contribute to the set up of a quantum spin-lattice relaxation theory beyond the Markovian limit, providing insight into the interplay of the quantum correlations developed in the microscopic irreversible dynamics and the dissipative macroscopic evolution. Finally, the analysis carried out in this work may contribute to the current discussion about the role of system-environment entanglement as basic mechanism of quantum decoherence of interacting particle systems 1,[25][26][27] .…”

Section: Introductionmentioning

confidence: 90%

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Quantum irreversible decoherence behaviour in open quantum systems with few degrees of freedom: Application to 1H NMR reversion experiments in nematic liquid crystals

Segnorile

Zamar²

2013

The Journal of Chemical Physics

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An experimental study of NMR spin decoherence in nematic liquid crystals is presented. Decoherence dynamics can be put in evidence by means of refocusing experiments of the dipolar interactions. The experimental technique used in this work is based on the MREV8 pulse sequence. The aim of the work is to detect the main features of the irreversible quantum decoherence in liquid crystals, on the basis of the theory presented by the authors recently. The focus is laid on experimentally probing the eigen-selection process in the intermediate time scale, between quantum interference of a closed system and thermalization, as a signature of the quantum spin decoherence of the open quantum system, as well as on quantifying the effects of non-idealities as possible sources of signal decays which could mask the intrinsic decoherence. In order to contrast experiment and theory, the theory was adapted to obtain the decoherence function corresponding to the MREV8 reversion experiments. Non-idealities of the experimental setting, like external field inhomogeneity, pulse misadjustments and the presence of non-reverted spin interaction terms are analysed in detail within this framework, and their effects on the observed signal decay are numerically estimated. It is found that, though all these non-idealities could in principle affect the evolution of the spin dynamics, their influence can be mitigated and they do not present the characteristic behaviour of the irreversible spin decoherence. As unique characteristic of decoherence, the experimental results clearly show the occurrence of eigen-selectivity in the intermediate timescale, in complete agreement with the theoretical predictions. We conclude that the eigen-selection effect is the fingerprint of decoherence associated with a quantum open spin system in liquid crystals. Besides, these features of the results account for the quasi-equilibrium states of the spin system, which were observed previously in these mesophases, and lead to conclude that the quasi-equilibrium is a definite stage of the spin dynamics during its evolution towards equilibrium.

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Section: Discussionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 90%

Quantum irreversible decoherence behaviour in open quantum systems with few degrees of freedom: Application to 1H NMR reversion experiments in nematic liquid crystals

Segnorile

Zamar²

2013

The Journal of Chemical Physics

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“…Decoherence of an open system can be caused by the increase of the entanglement between system and environment [1,7,8]. Pure state is turned into mixed state as the consequence of interaction between the system and environment [2,3,7,11].…”

Section: Phase Damping Channelmentioning

confidence: 99%

“…Closed system is an ideal system that does not interact with the outside world, whereas real system has undesirable interaction with the environment [1,2]. The interaction between an open quantum system and its surroundings causes correlation between the states of the system and of the environment that is called decoherence [3].…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Two-Qubit Decoherence by Using Bloch Vectors

Ahmadi¹,

Jami²

2014

Acta Phys. Pol. A

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The loss of the coherence happens due to the interaction between the desired system and its surroundings. Addressing decoherence is one of the main concepts in the study of quantum channels to access their potential for various scale. In this process the information of the system is penetrated into the environment. Therefore, the measurement of the environment could be used as the error correction method. Phase damping channels principally belong to random unitary channels and can be corrected by classical information. This paper presents a method to generate non-random unitary phase damping channels based on the Bloch vectors in two qubits systems. A phase damping channel which consisted of a two qubits system and a single qubit environment was investigated. The results demonstrated that the phase damping channels belong to random unitary dynamics if the three-dimensional tetrahedron volume spanned by the Bloch vectors in R 3 is not zero, or, the same hyperplane in R 3 was not pointed by the Bloch vectors. It is found that the Bell state belongs to random unitary class and can be corrected based on classical information obtained from environmental measurements.

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“…The physical implementation and verification of our model would allow then to verify the generalization of the LGKS theorem for the simplest nontrivial commutative open quantum system. Both the single qubit dephasing case and the dephasing of two qubits in local environments, indeed, have been shown to posses a random unitary representation [19].…”

Section: The Modelmentioning

confidence: 99%

Entanglement control via reservoir engineering in ultracold atomic gases

McEndoo¹,

Haikka²,

Chiara³

et al. 2013

EPL

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We study the entanglement of two impurity qubits immersed in a Bose-Einstein condensate (BEC) reservoir. This open quantum system is particularly interesting because the reservoir and system parameters are easily controllable and the reduced dynamics is highly non-Markovian. We show how the model allows for interpolation between a common dephasing scenario and an independent dephasing scenario by simply modifying the wavelength of the superlattice superposed to the BEC, and how this influences the dynamical properties of the impurities. We demonstrate the existence of very rich entanglement dynamics correspondent to different values of reservoir parameters, including phenomena such as entanglement trapping, entanglement sudden death, revivals of entanglement, and BEC-mediated entanglement generation. In the spirit of reservoir engineering, we present the optimal BEC parameters for entanglement generation and trapping, showing the key role of the ultracold gas interactions.

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System–environment correlations and non-Markovian dynamics

Cited by 42 publications

References 50 publications

Quantum irreversible decoherence behaviour in open quantum systems with few degrees of freedom: Application to 1H NMR reversion experiments in nematic liquid crystals

Quantum irreversible decoherence behaviour in open quantum systems with few degrees of freedom: Application to 1H NMR reversion experiments in nematic liquid crystals

Investigation of a Two-Qubit Decoherence by Using Bloch Vectors

Entanglement control via reservoir engineering in ultracold atomic gases

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