Magnetic Field Effect on the Coherence Time of Asymmetric Gaussian Confinement Potential Quantum Well Qubits

Under a strong electron-LO-phonon coupling in asymmetric Gaussian confinement potential quantum wells (AGCPQWs) when exposed to external magnetic fields, the AGCPQW qubit coherent time can be obtained from Fermi's golden rule and the variational method of Pekar type. We have calculated the cohe...

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Bibliographic Details
Published in:Journal of low temperature physics 2022, Vol.206 (3-4), p.191-198
Main Authors: Feng, Li-Qin, Qiu, Wei, Ma, Xin-Jun, Sun, Yong, Xiao, Jing-Lin
Format: Article
Language:English
Subjects:
Asymmetry
Characterization and Evaluation of Materials
Condensed Matter Physics
Confinement
Cyclotron frequency
Cyclotrons
Low temperature physics
Magnetic fields
Magnetic Materials
Magnetism
Mathematical analysis
Physics
Physics and Astronomy
Polarons
Quantum wells
Qubits (quantum computing)
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Summary:Under a strong electron-LO-phonon coupling in asymmetric Gaussian confinement potential quantum wells (AGCPQWs) when exposed to external magnetic fields, the AGCPQW qubit coherent time can be obtained from Fermi's golden rule and the variational method of Pekar type. We have calculated the coherence times of two-level quantum systems in RbCl AGCPQWs in external magnetic fields with varying with cyclotron frequency of magnetic field, confinement potential range (CPR), AGCPQW height, oscillating frequency and polaron radius were theoretically calculated. Based on the numerical results, we found that the coherence time was increased by decreasing magnetic field cyclotron frequency, AGCPQW height, oscillating frequency and polaron radius. Also, the coherence time was decreased with CPR for R < 0.7 nm and increased for R > 0.7 nm , with minimum value at R = 0.7 nm , ω c = 10 × 10 13 Hz and τ = 409.9 ps .
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-021-02651-2