Active interference suppression in frequency-division-multiplexed quantum gates via off-resonant microwave tones

TL;DR

This paper introduces an active interference suppression technique using off-resonant microwave tones to enhance the fidelity of frequency-division-multiplexed quantum gates, addressing control line bottlenecks in scalable quantum computing.

Contribution

It proposes a novel method employing off-resonant microwave tones to actively suppress interference in multiplexed quantum gates, improving fidelity.

Findings

Gate infidelity scales inversely with the square of the number of microwave tones.

Fast oscillations degrade gate fidelity but can be mitigated by optimized frequency allocation.

The approach is simple, effective, and enhances multiplexed quantum gate performance.

Abstract

The increasing number of control lines connecting quantum processors to external electronics constitutes a major bottleneck in the realization of large-scale quantum computers. Frequency-division multiplexing is expected to enable control of multiple qubits through a single microwave cable; however, interference from off-resonant microwave tones hinders precise qubit control. Here, we propose an active interference suppression method for frequency-division-multiplexed simultaneous gate operations. We demonstrate that the deliberate incorporation of off-resonant microwave tones improves single-qubit gate fidelity. In particular, the gate infidelity scales inversely with the square of the number of microwave tones when off-resonant orthogonal or quasi-orthogonal tones are incorporated. Furthermore, we show that fast oscillations, neglected under the rotating wave approximation, degrade the gate fidelity, and that this degradation can be mitigated through optimized frequency allocation. The proposed approach is simple and effective for improving the performance of frequency-division-multiplexed quantum gates.