Integrated silicon qubit platform with single-spin addressability, exchange control and robust single-shot singlet-triplet readout

TL;DR

This paper presents an integrated silicon quantum dot platform enabling simultaneous single-spin control and high-fidelity singlet-triplet readout, advancing scalable quantum computing with silicon qubits.

Contribution

It introduces a silicon quantum dot device capable of both ESR-based single-spin control and robust singlet-triplet readout, combining control and measurement methods previously used separately.

Findings

Achieved single-spin addressability via ESR in silicon quantum dots.

Implemented high-fidelity singlet-triplet readout.

Demonstrated integrated control and measurement in a scalable platform.

Abstract

Silicon quantum dot spin qubits provide a promising platform for large-scale quantum computation because of their compatibility with conventional CMOS manufacturing and the long coherence times accessible using $^{28}$Si enriched material. A scalable error-corrected quantum processor, however, will require control of many qubits in parallel, while performing error detection across the constituent qubits. Spin resonance techniques are a convenient path to parallel two-axis control, while Pauli spin blockade can be used to realize local parity measurements for error detection. Despite this, silicon qubit implementations have so far focused on either single-spin resonance control, or control and measurement via voltage-pulse detuning in the two-spin singlet-triplet basis, but not both simultaneously. Here, we demonstrate an integrated device platform incorporating a silicon metal-oxide-semiconductor double quantum dot that is capable of single-spin addressing and control via electron spin resonance, combined with high-fidelity spin readout in the singlet-triplet basis.