Coupling Two Spin Qubits with a High-Impedance Resonator

TL;DR

This paper proposes a method for implementing fast, high-fidelity two-qubit gates between spin qubits mediated by a high-impedance resonator, achieving over 96% fidelity with current technology.

Contribution

It introduces a novel approach using longitudinal coupling and high-impedance resonators to perform long-distance two-qubit gates with high fidelity in spin qubits.

Findings

Gate times of around 10 ns are achievable.

Simulations show over 96% fidelity with current parameters.

Fidelity depends on resonator impedance, quality, and qubit noise.

Abstract

Fast, high-fidelity single and two-qubit gates are essential to building a viable quantum information processor, but achieving both in the same system has proved challenging for spin qubits. We propose and analyze an approach to perform a long-distance two-qubit controlled phase (CPHASE) gate between two singlet-triplet qubits using an electromagnetic resonator to mediate their interaction. The qubits couple longitudinally to the resonator, and by driving the qubits near the resonator's frequency they can be made to acquire a state-dependent geometric phase that leads to a CPHASE gate independent of the initial state of the resonator. Using high impedance resonators enables gate times of order 10 ns while maintaining long coherence times. Simulations show average gate fidelities of over 96% using currently achievable experimental parameters and over 99% using state-of-the-art resonator technology. After optimizing the gate fidelity in terms of parameters tuneable in-situ, we find it takes a simple power-law form in terms of the resonator's impedance and quality and the qubits' noise bath.