Non-reciprocal Pauli Spin Blockade in a Silicon Double Quantum Dot
ORAL
Abstract
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.
*This work received support from the European Union's Horizon 2020 research and innovation programme [951852]; and the Engineering and Physical Sciences Research Council [EP/L015978/1, EP/L015730/1]. MFGZ acknowledges a UKRI Future Leaders Fellowship [MR/V023284/1].
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Publication: T. Lundberg et al., arXiv:2110.09842 (2021)
Presenters
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David Ibberson
- Quantum Motion Technologies Ltd.
- Quantum Motion