Charge and spin control of Andreev states in semiconducting Josephson junctions

ORAL

Abstract

Andreev spin qubits are known to be supported in Josephson junctions mediated by quasi-one-dimensional semiconductors with strong spin-orbit interaction. We theoretically study the Andreev state spectrum as a function of applied magnetic field, phase difference, and filling of the underlying semiconductor, all of which can be controlled in situ in experiments. ​Additionally, we show that one can control the effective charge and spin of the Andreev states by changing these experimental knobs. Consequently, we find a dependence of the coherence time as a function of magnetic field, phase difference and filling. We show that this dependence can be used to identify the dominant noise sources in Andreev spin qubits and tune to sweet spots to protect against them.

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Presenters

  • Charles Tahan

    Laboratory for Physical Sciences

Authors

  • Charles Tahan

    Laboratory for Physical Sciences

  • Silas Hoffman

    Laboratory for Physical Sciences

  • Max Hays

    MIT, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology MI, Massachusetts Institute of Technology, Massachussets Institute of Technology, Massachusetts Institute of Technology MIT

  • Kyle Serniak

    MIT Lincoln Laboratory & MIT RLE, MIT Lincoln Laboratory, MIT Lincoln Laboratory, MIT RLE

  • Thomas M Hazard

    Lincoln Laboratory, Massachusetts Institute of Technology, MIT Lincoln Lab, MIT Lincoln Laboratory