Quantum Information Transfer from a Double Quantum Dot System to a Cavity Field

The effects of the temperature on the coherence time of a parabolic quantum dot (PQD) qubit are investigated by using the variational method of Pekar type. We obtain the ground and the first excited states' eigenenergies and the corresponding eigenfunctions of an electron strongly coupled to bulk longitudinal optical phonons in the PQD. This two-level PQD system may be employed as a single qubit. The phonon spontaneous emission causes the decoherence of the qubit. We find that the coherence time will decrease with increasing temperature. It is an increasing function of the effective confinement length, whereas it is decreasing one of the polaron radius. We find that by changing the temperature, the effective confinement length and the polaron radius one can adjust the coherence time. Our research results would be useful for the design and implementation of the solid-state quantum computation.

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Effect of temperature on the coherence time of a parabolic quantum dot qubit

Xiao

Wang

2015

Low Temperature Physics

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Polaron dynamics and decoherence in an interacting two-spin system coupled to an optical-phonon environment

Dey

Yarlagadda

2014

Phys. Rev. B

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We study two anisotropically interacting spins coupled to optical phonons; we restrict our analysis to the regime of strong coupling to the environment, to the antiadiabatic region, and to the subspace with zero value for S z T (the z-component of the total spin). In the case where each spin is coupled to a different phonon bath, we assume that the system and the environment are initially uncorrelated (and form a simply separable state) in the polaronic frame of reference. By analyzing the polaron dynamics through non-Markovian quantum master equation, we find that the system manifests a small amount of decoherence that decreases both with increasing non-adiabaticity and with enhancing strength of coupling; whereas, under the Markovian approximation, the polaronic system exhibits a decoherence free behavior. For the situation where both spins are coupled to the same phonon bath, we also show that the system is decoherence free in the subspace where S z T is fixed. To suppress decoherence through quantum control, we employ a train of pi pulses and demonstrate that unitary evolution of the system can be retained.We propose realization of a weakly decohering charge qubit from an electron in an oxide-based (tunnel-coupled) double quantum dot system.

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Quantum Information Transfer from a Double Quantum Dot System to a Cavity Field

Cited by 2 publications

References 34 publications

Effect of temperature on the coherence time of a parabolic quantum dot qubit

Effect of temperature on the coherence time of a parabolic quantum dot qubit

Polaron dynamics and decoherence in an interacting two-spin system coupled to an optical-phonon environment

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