Feedback-based active reset of a spin qubit in silicon

Abstract

Feedback control of qubits is a highly demanded technique for advanced quantum information protocols such as quantum error correction. Here we demonstrate active reset of a silicon spin qubit using feedback control. The active reset is based on quantum non-demolition readout of the qubit and feedback according to the readout results, which is enabled by hardware data processing and sequencing. We incorporate a cumulative readout technique to the active reset protocol, enhancing initialization fidelity above a limitation imposed by accuracy of the single QND measurement fidelity. Based on an analysis of the reset protocol, we suggest a way to achieve the initialization fidelity sufficient for the fault-tolerant quantum computation.

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• Efficient adaptive Bayesian estimation of a slowly fluctuating Overhauser field gradient
• Charge-induced energy shift of a single-spin qubit under a magnetic-field gradient
• High-fidelity spin readout via the double latching mechanism