The effect of temperature and magnetic field on a quantum rod qubit

Sun, Yong; Ding, Zhao-Hua; Xiao, Jing‐Lin

doi:10.1007/s11128-012-0436-1

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…Following the VMPT [19,20], the trial wave function of the electron-phonon system can be separated into two parts, which separately describes the electron and phonon. Then the system's trial the ground and the first excited states' (GFES') wave functions may be chosen [13,15] …”

Section: Theoretical Model and Calculationsmentioning

confidence: 99%

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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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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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Section: Theoretical Model and Calculationsmentioning

confidence: 99%

“…Chen et al [12] used the variational method of Pekar type (VMPT) to investigate the effect of temperature on the PQD qubit in the electric field. Sun et al [13] studied the effects of temperature and magnetic field on a quantum rod qubit. Wang et al [14] obtained the decoherence time of the PQD qubit by using VMPT.…”

Section: Introductionmentioning

confidence: 99%

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

Xiao

Wang

2015

Low Temperature Physics

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The Landau-level structure of a single polaron in a nanorod under a non-uniform magnetic field

Ou¹,

An²,

Zhang³

et al. 2023

Commun. Theor. Phys.

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Nanorod is a unique low-dimensional nanometer structure in which the Landau level arrangement of polaron is essential for understanding its' quasiparticle system. However, the stability of the polaron level is susceptible to external factors, such as changing magnetic fields. In this manuscript, the Pekar variational method is employed to calculate the external magnetic field's effect on the nanorod's polaron Landau level. It was found that different magnetic fields have different effects on the polaron energy levels of the nanorod, which demonstrated that the external environment had critical effects on the polaron energy levels. This study provides a theoretical basis for regulating the interaction between electrons and phonons in low-dimensional nanomaterials.

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The effect of temperature and magnetic field on a quantum rod qubit

Cited by 2 publications

References 16 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

The Landau-level structure of a single polaron in a nanorod under a non-uniform magnetic field

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