Observation of Environment-Induced Double Sudden Transitions in Geometric Quantum Correlations

Paula, F. M.; Silva, I. A.; Montealegre, J. D.; Souza, Alexandre M.; deAzevedo, Eduardo R.; Sarthour, R. S.; Saguia, A.; Oliveira, I. S.; Soares-Pinto, Diogo O.; Adesso, Gerardo; Sarandy, M. S.

doi:10.1103/physrevlett.111.250401

Cited by 73 publications

(72 citation statements)

References 58 publications

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“…3(a-c), the dynamics of Q S (t) can exhibit explicit non-Markvian revivals, double sudden changes and immunity to decoherence decay in the regions h ≪ 1, h ≃ 1 and h ≫ 1 respectively. It is worth noting that this type behaviour of environment-induced double sudden changes has been experimentally reported very recently [29].…”

Section: Dynamics Of Negativity Of Quantumness From Thermal Spinsupporting

confidence: 69%

Negativity of Quantumness and Non-Markovianity in a Qubit Coupled to a Thermal Ising Spin Bath System

Zhang

2014

Commun. Theor. Phys.

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We propose a scheme to characterize the non-Markovian dynamics and quantify the nonMarkovianity via the non-classicality measured by the negativity of quantumness. By considering a qubit in contact with a critical Ising spin bath and introducing an ancilla, we show that revivals of negativity of quantumness indicate the non-Markovian dynamics. Furthermore, a normalized measure of non-Markovianity based on the negativity of quantumness is introduced and the influences of bath criticality, bath temperature and bath size on the non-Markovianity are discussed. It is shown that, at the critical point, the decay of non-Markovianity versus the size of spin bath is fastest and the non-Markovianity is exactly zero only in the thermodynamic limit. Besides, nontrivial behaviours of negativity of quantumness such as sudden change, double sudden changes and keeping constant are found for different relations between parameters of the initial state. Finally, how the non-classicality of the system is affected by a series of bang-bang pulses is also examined.

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Section: Dynamics Of Negativity Of Quantumness From Thermal Spinsupporting

confidence: 69%

Negativity of Quantumness and Non-Markovianity in a Qubit Coupled to a Thermal Ising Spin Bath System

Zhang

2014

Commun. Theor. Phys.

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“…We find that all three quantum indicators show an exponential decay of the quantum properties of the two-level system induced by the coupling to the external thermal reservoir. Remarkably, we establish that all three characteristic times are equal and given by the coherence half-life [55,56]. These findings clarify how violations of the Leggett-Garg inequalities and non-vanishing values of the quantum witness are related to the quantum coherence of the two-level system.…”

Section: Introductionsupporting

confidence: 62%

Assessing the quantumness of a damped two-level system

Friedenberger

Lutz

2017

Phys. Rev. A

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We perform a detailed analysis of the nonclassical properties of a damped two-level system. We compute and compare three different criteria of quantumness, the l1-norm of coherence, the LeggettGarg inequality and a quantum witness based on the no-signaling in time condition. We show that all three quantum indicators decay exponentially in time as a result of the coupling to the thermal reservoir. We further demonstrate that the corresponding characteristic times are identical and given by the coherence half-life. These results quantify how violations of Leggett-Garg inequalities and nonzero values of the quantum witness are connected to the coherence of the two-level system.

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“…This has been demonstrated for a system experiencing decoherence by a dephasing channel. Furthermore, it has been shown experimentally [11][12][13], that classical correlations may change abruptly to a non-vanishing stationary value. This feature has been proposed to determine whether a quantum system has reached its classical regime or not [12].…”

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confidence: 99%

Emergence of a metastable pointer-state basis in non-Markovian quantum dynamics

et al. 2014

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We investigate the dynamics of classical and quantum correlations between two qubits. Each qubit is implemented by a pair of phosphorous impurities embedded in a silicon substrate. The main decoherence mechanism affecting these types of qubits is provided by the coupling of the phosphorous impurities to the acoustical vibrations of the silicon lattice. We find that depending on the temperature of the substrate and the initial state, three different dynamics can be found. These are characterized by the number of abrupt changes in both classical and quantum correlations. We also show that the correlations do not disappear. Moreover, before the classical correlations reach a constant value, they may experience successive abrupt changes associated with the apparition of metastable pointer states basis. Then, a constant value for the classical correlations is reached when the preferred basis is established.PACS numbers: 03.65. Yz, 03.65.Ud,03.67Lx Recently the study of classical and quantum correlations has become a central subject of investigation. The study of quantum correlations between quantum systems is a problem as old as the quantum theory. For many years, it was widely believed that quantum entanglement would be the only relevant type of correlation for quantum information protocols. However, it has been proved that efficient quantum protocols can be performed in the absence of entanglement [1]. A bipartite quantum system A-B can feature both quantum and classical correlations between its constituent parts A and B, respectively. All these correlations can be characterized by the quantum mutual information [2, 3]where where C(ρ AB ) are the classical correlations [2], [6] defined by the following maximization procedure: A complete set of projector operators {Π k } must be constructed for the subsystem B. Then the quantity C(ρ AB ) = max

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Observation of Environment-Induced Double Sudden Transitions in Geometric Quantum Correlations

Cited by 73 publications

References 58 publications

Negativity of Quantumness and Non-Markovianity in a Qubit Coupled to a Thermal Ising Spin Bath System

Negativity of Quantumness and Non-Markovianity in a Qubit Coupled to a Thermal Ising Spin Bath System

Assessing the quantumness of a damped two-level system

Emergence of a metastable pointer-state basis in non-Markovian quantum dynamics

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