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N72: Semiconductor Qubits: Spin Qubit Measurement II

Room 406

Sponsoring Units: DQIChair: Sophie Hermans, California Institute of TechnologySession Type:

    Wed. March 8, 1:06 p.m. – 1:18 p.m. PST

    Room 406

    Spin qubits in gate-defined silicon quantum dots are receiving increased attention thanks to their potential for large-scale quantum computing. Readout of such spin qubits is done most accurately and scalably via Pauli spin blockade (PSB), however various mechanisms may lift PSB and complicate readout. In this work, we present an experimental observation of a new, highly prevalent PSB-lifting mechanism in a silicon double quantum dot due to incoherent tunnelling between different spin manifolds. Through dispersively-detected magnetospectroscopy of the double quantum dot in 16 charge configurations, we find the mechanism to be energy-level selective and non-reciprocal for neighbouring charge configurations. Additionally, using input-output theory we report a large coupling of different electron spin manifolds of 7.90 μeV, the largest reported to date, indicating an enhanced spin-orbit coupling which may enable all-electrical qubit control.

    Presented By

    • David Ibberson (Quantum Motion Technologies Ltd.)


    • David Ibberson (Quantum Motion Technologies Ltd.)
    • Theodor Lundberg (Univ of Cambridge)
    • Jing Li (Universite Grenoble Alpes)
    • Louis Hutin (Universite Grenoble Alpes)
    • Jose Carlos Abadillo-Uriel (CEA Grenoble)
    • Michele Filippone (CEA Grenoble)
    • Benoit Bertrand (CEA LETI)
    • Andreas Nunnenkamp (University of Vienna)
    • Chang-Min Lee (University of Cambridge)
    • Nadia Stelmashenko (University of Cambridge)
    • Jason Robinson (University of Cambridge)
    • Maud Vinet (CEA-Leti)
    • Lisa Ibberson (Hitachi Cambridge Laboratory)
    • Yann-Michel Niquet (CEA Grenoble)
    • Fernando Gonzalez-Zalba (Quantum Motion Technologies Ltd.)