Robust photon-mediated entangling gates between quantum dot spin qubits

TL;DR

This paper introduces a robust photon-mediated entangling gate for silicon spin qubits that does not require resonant tuning and includes error suppression techniques, advancing scalable quantum computing.

Contribution

It presents a new cross-resonance gate design that is compatible with current experimental setups and enhances fidelity by error suppression methods.

Findings

The proposed gate operates without resonant tuning.

Error suppression sequences improve gate fidelity.

The approach is feasible with existing silicon spin qubit technology.

Abstract

Significant experimental advances in single-electron silicon spin qubits have opened the possibility of realizing long-range entangling gates mediated by microwave photons. Recently proposed iSWAP gates, however, require tuning qubit energies into resonance and have limited fidelity due to charge noise. We present a novel photon-mediated cross-resonance gate that is consistent with realistic experimental capabilities and requires no resonant tuning. Furthermore, we propose gate sequences capable of suppressing errors due to quasistatic noise for both the cross-resonance and iSWAP gates.