Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physica B Condensed Matter

Magnetic field effects on the properties of GaAs quantum dot qubit due to electron–phonon interactions

Shi‐Hua Chen

Published Jul 14, 2014• 3 citations
Publisher
DOI
10.1016/j.physb.2014.07.005

Related papers

The Decoherence of GaAs Quantum Dot Qubit Due to Electron–Phonon Interactions

Shi‐Hua Chen

Journal of Low Temperature Physics•Apr 30, 2013•0 citations

Investigation of Rashba spin–orbit interaction and magnetic field in tailoring the electronic and optical properties of a GaAs quantum dot

Munesh Bansal, Sahil, S. B. Bhardwaj +4 more

Optical and Quantum Electronics•May 30, 2026•0 citations

The decoherence time of anisotropic quantum dot qubit: Effects of electric field, electron–phonon interactions, and impurities

Shi‐Hua Chen

Superlattices and Microstructures•Apr 7, 2021•0 citations

Optical properties and effect of magnetic field on energy spectra of a GaAs spherical quantum dot

Vinod Kumar, S. B. Bhardwaj, Ram Mehar Singh +1 more

The European Physical Journal Plus•Mar 2, 2023•14 citations

Spin qubit gates via phonon buses in electron nanowires

Dylan Lewis, Roopayan Ghosh, Sanjeev Kumar +4 more

Scalable architectures for quantum computing using semiconductor quantum dots require interactions between qubits beyond adjacent quantum dots. Here, we propose using nanowires of electrons to mediate the interaction between two quantum dots. Virtual phonons in the linear chain of electrons can mediate an interaction that gives rise to effective spin-spin coupling of the electrons in distant quantum dots. We find coupling strengths of more than 30 MHz for experimentally realisable parameters in GaAs quantum dots.

cond-mat.mes-hallCross-listedarXiv:2603.13519•Mar 17, 2026•0 citations

Phonon-assisted relaxation and decoherence of singlet-triplet qubits in Si/SiGe quantum dots

Viktoriia Kornich, Christoph Kloeffel, Daniel Loss

We study theoretically the phonon-induced relaxation and decoherence of spin states of two electrons in a lateral double quantum dot in a SiGe/Si/SiGe heterostructure. We consider two types of singlet-triplet spin qubits and calculate their relaxation and decoherence times, in particular as a function of level hybridization, temperature, magnetic field, spin orbit interaction, and detuning between the quantum dots, using Bloch-Redfield theory. We show that the magnetic field gradient, which is usually applied to operate the spin qubit, may reduce the relaxation time by more than an order of magnitude. Using this insight, we identify an optimal regime where the magnetic field gradient does not affect the relaxation time significantly, and we propose regimes of longest decay times. We take into account the effects of one-phonon and two-phonon processes and suggest how our theory can be tested experimentally. The spin lifetimes we find here for Si-based quantum dots are significantly longer than the ones reported for their GaAs counterparts.

arXiv:1511.07369•Quantum•May 28, 2018•16 citations
Scalable architectures for quantum computing using semiconductor quantum dots require interactions between qubits beyond adjacent quantum dots. Here, we propose using nanowires of electrons to mediate the interaction between two quantum dots. Virtual phonons in the linear chain of electrons can mediate an interaction that gives rise to effective spin-spin coupling of the electrons in distant quantum dots. We find coupling strengths of more than 30 MHz for experimentally realisable parameters in GaAs quantum dots.
We study theoretically the phonon-induced relaxation and decoherence of spin states of two electrons in a lateral double quantum dot in a SiGe/Si/SiGe heterostructure. We consider two types of singlet-triplet spin qubits and calculate their relaxation and decoherence times, in particular as a function of level hybridization, temperature, magnetic field, spin orbit interaction, and detuning between the quantum dots, using Bloch-Redfield theory. We show that the magnetic field gradient, which is usually applied to operate the spin qubit, may reduce the relaxation time by more than an order of magnitude. Using this insight, we identify an optimal regime where the magnetic field gradient does not affect the relaxation time significantly, and we propose regimes of longest decay times. We take into account the effects of one-phonon and two-phonon processes and suggest how our theory can be tested experimentally. The spin lifetimes we find here for Si-based quantum dots are significantly longer than the ones reported for their GaAs counterparts.