Decoherence and relaxation of qubits coupled to low- and medium-frequency Ohmic baths directly and via a harmonic oscillator

Liang, Xian-Ting

doi:10.1016/j.chemphys.2008.05.015

Cited by 11 publications

(9 citation statements)

References 36 publications

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“…Comparing the calculations of the density matrix in Refs. [24][25][26][27][28][29][30][31][32] we find that there are some differences 084211-3 from our results. In order to calculate the correlation function, the evolution is separated into three segments (𝜏 1 , 𝜏 2 , 𝜏 3 ).…”

Section: (𝑐)contrasting

confidence: 88%

Two-Dimensional Nonlinear Laser Spectra Calculations with Numerical Path Integral

Liang¹

2012

Chinese Phys. Lett.

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Two-dimensional three-order nonlinear response functions and the laser spectra of the two-level Frenkel-exciton model, interacting with three short laser pulses in direction -k1 + k2 + k3, are calculated using the numerical path integral. The method is non-Markovian and the results show that the numerical simulation scheme provides a new pathway for theoretically investigating the multidimensional ultrafast laser spectra including the non-Markovian effects.

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Section: (𝑐)contrasting

confidence: 88%

Two-Dimensional Nonlinear Laser Spectra Calculations with Numerical Path Integral

Liang¹

2012

Chinese Phys. Lett.

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“…Since the spectral poses challenge to many existing method, it arouse much attention recently. Till now, it has been studied by many different methods including the quasiadiabatic propagator path integral (QUAPI) [22,27,28], the Van Vleck perturbation theory together with a Born-Markov master equation [29], the flow equation renormalization [30][31][32], the non-interacting blip approximation (NIBA) [31,33], and generalized polaron transformation method [34][35][36]. Again, most of the works have not considered the effect of temperature.…”

Section: St Model: Qubit Coupled To a Tlfmentioning

confidence: 99%

Effect of bath temperature on the quantum decoherence

Huang¹,

Zheng²

2010

Chemical Physics Letters

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The dynamics of a qubit in two different environments are investigated theoretically. The first environment is a two level system coupled to a bosonic bath. And the second one is a damped harmonic oscillator. Based on a unitary transformation, we find that the decoherence of the qubit can be reduced with increasing temperature $T$ in the first case, which agree with the results in [Phys. Rev. Lett. 100, 120401], whereas, it can not be reduced with $T$ in the second case. In both cases, the qubit dynamics are changed substantially as the coupling increases or finite detuning appears.Comment: 10 pages, 5 figure

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“…In this paper, we investigate the effect of system-reservoir correlations on the precision of temperature estimation in a spin-boson (SB) model with arbitrary spin sizes, in which a spin acts as the probe to measure the temperature of a bosonic reservoir, by making use of the reaction coordinate mapping method. [20,21,[25][26][27] The reaction coordinate mapping, which was originally proposed by Garg et al in Ref. [25], can exactly convert the conventional SB model into an equivalent model without any approximations and has been widely applied in studies of electron transfer in biomolecules [25] as well as heat transport in a nonequilibrium environment.…”

Section: Introductionmentioning

confidence: 99%

Effect of system–reservoir correlations on temperature estimation*

Wen-li

Luo

2020

Chinese Phys. B

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In many previous temperature estimation schemes, the temperature of a sample is directly read out from the final steady state of a quantum probe, which is coupled to the sample. However, in these studies, information of correlations between system (the probe) and reservoir (the sample) is usually eliminated, leading the steady state of the probe is a canonical equilibrium state with respect solely to system’s Hamiltonian. To explore the influence of system–reservoir correlations on the estimation precision, we investigate the equilibration dynamics of a spin interacting with a finite temperature bosonic reservoir. By incorporating an intermediate harmonic oscillator or a collective coordinate into the spin, the system–reservoir correlations can be correspondingly encoded in a Gibbs state of an effective Hamilton, which is size consistent with the original bare spin. Extracting information of temperature from this corrected steady state, we find the effect of the system-reservoir correlations on the estimation precision is highly sensitive to the details of the spectral density function of the measured reservoir.

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Decoherence and relaxation of qubits coupled to low- and medium-frequency Ohmic baths directly and via a harmonic oscillator

Cited by 11 publications

References 36 publications

Two-Dimensional Nonlinear Laser Spectra Calculations with Numerical Path Integral

Two-Dimensional Nonlinear Laser Spectra Calculations with Numerical Path Integral

Effect of bath temperature on the quantum decoherence

Effect of system–reservoir correlations on temperature estimation*

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