Electrically-protected resonant exchange qubits in triple quantum dots

TL;DR

This paper introduces a microwave-controlled quantum computing approach using triple quantum dot spin qubits that are resistant to electrical noise and can strongly couple with microwave resonators for improved two-qubit operations.

Contribution

It proposes a novel modulated microwave technique for triple quantum dot qubits with noise protection and enhanced coupling capabilities, building on existing double quantum dot methods.

Findings

Protected single- and two-qubit gates against electrical noise

Immediate applicability of double quantum dot techniques

Strong coupling with superconducting microwave resonators

Abstract

We present a modulated microwave approach for quantum computing with qubits comprising three spins in a triple quantum dot. This approach includes single- and two-qubit gates that are protected against low-frequency electrical noise, due to an operating point with a narrowband response to high frequency electric fields. Furthermore, existing double quantum dot advances, including robust preparation and measurement via spin-to-charge conversion, are immediately applicable to the new qubit. Finally, the electric dipole terms implicit in the high frequency coupling enable strong coupling with superconducting microwave resonators, leading to more robust two-qubit gates.