Effect of a gap on the decoherence of a qubit

Restrepo, Juliana; Читра, Р.; Camalet, S.; Dupont, Émilie

doi:10.1103/physrevb.84.245109

Cited by 8 publications

(15 citation statements)

References 24 publications

(44 reference statements)

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“…Moreover, as the kinetic energy is positive, the same argument holds for time-dependent configurations. The particular status in the presented argumentation has the second inequality in formula (8). Let us notice that equality at this position has a special status, it is satisfied only in the case of flat space (F = 1).…”

Section: Bogomolny Analysismentioning

confidence: 89%

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Kink Profile in a Curved Space

Dobrowolski¹

2015

Acta Phys. Pol. B

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Section: Bogomolny Analysismentioning

confidence: 89%

“…This paper shows that for slowly varying curvatures,s the appropriate 1+1 dimensional model correctly describes curved Josephson junctions. The studies of the influence of the nontrivial shape of the Josephson junction on the kink motion were also undertaken in papers [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Kink Profile in a Curved Space

Dobrowolski¹

2015

Acta Phys. Pol. B

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“…In general, methods like the Time Convolutionless (TCL) and the Nakajima-Zwanzig (NZ) approach 14 can deal with both Markovian and non-Markovian dynamics. The accuracy of these schemes depends on the problem studied, making it difficult to assert a priori which one is more appropriate 21,22 . In the present problem, since the qubit has intrinsic dynamics H S = 0, we anticipate a Markovian time evolution of the reduced density matrix at long times 19 .…”

Section: A Born Markov Master Equationmentioning

confidence: 99%

Heat current characteristics in nanojunctions with superconducting baths

Oettinger¹,

Читра²,

Restrepo

2014

Eur. Phys. J. B

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As a fundamental requisite for thermotronics, controlling heat flow has been a longstanding quest in solid state physics. Recently, there has been a lot of interest in nanoscale hybrid systems as possible candidates for thermal devices. In this context, we study the heat current in the simplest hybrid device of a two level system weakly coupled to two heat baths. We use the reduced density matrix approach together with a simple Born-Markov approximation to calculate the heat current in the steady state. We consider different kinds of reservoirs and show that the nature of the reservoir plays a very important role in determining the thermal characteristics of the device. In particular, we investigate the effectiveness of a conventional superconductor as a reservoir with regard to manipulating the heat current. In the emergent temperature characteristics, we find that superconductivity in the reservoirs leads to enhanced thermal currents and that the superconducting phase transition is clearly visible in the heat current. We observe negative differential thermal conductance and a pronounced rectification of the heat current, making this a good building block for a quantum thermal diode. arXiv:1404.1385v1 [cond-mat.mes-hall]

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“…The system plus environment is described by the Hamiltonian [1]. To facilitate applying the excitation operator method, we re-express the Hamiltonian of the reservoir in real space in terms of an infinite chain:…”

Section: The Model and The Orthonormal Basis Of The Operator Spacementioning

confidence: 99%

“…The decoherence of a small quantum system coupled to a fermionic bath has recently attracted much attention [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], due to the fact that the fermionic bath manifests as an important source of decoherence in a wide range of electronic devices designed for solid-state quantum computers. In spite of considerable effort, a thorough understanding of the coherence dynamics of fermionic baths is still lack in the non-Markovian regime.…”

Section: Introductionmentioning

confidence: 99%

The excitation operator approach to non-Markovian dynamics of quantum impurity models in the Kondo regime

Wang

2013

Eur. Phys. J. B

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We present a numerical method for studying the real time dynamics of a small interacting quantum system coupled to an infinite fermionic reservoir. By building an orthonormal basis in the operator space, we turn the Heisenberg equation of motion into a system of linear differential equations, which is then solved iteratively by constructing excitation operators. The application of our method depends on a layer structure in the operator space, which help us to turn an infinite linear system into a series of small systems. We apply the method to investigate the decoherence dynamics of quantum impurity models in the Kondo regime with a non-Markovian reservoir. Taking full account of environmental back-actions and electron-electron interactions, we find that the coexistence of the Kondo correlation and a non-Markovian reservoir induces coherence ringings, which will be suppressed by either driving the system away from the particle-hole symmetric point or changing the reservoir into a Markovian one.

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Effect of a gap on the decoherence of a qubit

Cited by 8 publications

References 24 publications

Kink Profile in a Curved Space

Kink Profile in a Curved Space

Heat current characteristics in nanojunctions with superconducting baths

The excitation operator approach to non-Markovian dynamics of quantum impurity models in the Kondo regime

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