Decoherence in Andreev spin qubits
Silas Hoffman, Max Hays, Kyle Serniak, Thomas Hazard, Charles Tahan
DOI 10.1103/PhysRevB.111.045304 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We theoretically study the dephasing of an Andreev spin qubit (ASQ) due to electric and magnetic noise. Using a tight-binding model, we calculate the Andreev states formed in a Josephson junction where the link is a semiconductor with strong spin-orbit interaction. As a result of both the spin-orbit interaction and induced superconductivity, the local charge and spin of these states vary as a function of externally controllable parameters: the phase difference between the superconducting leads, an applied magnetic field, and filling of the underlying semiconductor. Concomitantly, coupling to fluctuations of the electric or magnetic environment will vary, which informs the rate of dephasing. We qualitatively predict the dependence of dephasing on the nature of the environment, magnetic field, phase difference between the junction, and filling of the semiconductor. Comparing the simulated electric- and magnetic-noise-induced dephasing rate to experiment suggests that the dominant source of noise is magnetic. Moreover, by appropriately tuning these external parameters, we find sweet spots at which we predict an enhancement in ASQ coherence times.
Similar papers
Impurity-induced dephasing of Andreev states
similarity 0.91N. I. Lundin & Y. M. Galperin
Source status unknown — claims are unverified
Quantum Two Level Systems and Kondo-Like Traps as Possible Sources of Decoherence in Superconducting Qubits
similarity 0.91Lara Faoro & Lev B. Ioffe
Source status unknown — claims are unverified
Controlled dephasing of Andreev states in superconducting quantum point contacts
similarity 0.90M. A. Despósito & A. Levy Yeyati
Source status unknown — claims are unverified
Interacting two-level defects as sources of fluctuating high-frequency noise in superconducting circuits
similarity 0.90Clemens Müller et al.
Source status unknown — claims are unverified
Quantum decoherence of a charge qubit in a spin-fermion model
similarity 0.90R. M. Lutchyn et al. · 2008 · arXiv:0803.3452
Source status unknown — claims are unverified
Andreev spin qubits based on the helical edge states of magnetically doped two-dimensional topological insulators
similarity 0.89Edoardo Latini et al. · 2026 · arXiv:2601.22226
Source status unknown — claims are unverified