Noise-resistant phase gates with amplitude modulation

TL;DR

This paper introduces a pulse modulation scheme for fast, noise-resistant phase gates in quantum systems, enhancing robustness against various noise sources and energy relaxation.

Contribution

It presents a novel amplitude modulation method for implementing robust, fast arbitrary phase gates with improved resistance to noise and decoherence.

Findings

Enhanced gate robustness against control errors and cavity decay.

Intrinsic resistance to energy relaxation of qutrits.

Significant improvement in gate fidelity through amplitude modulation.

Abstract

We propose a simple scheme for implementing fast arbitrary phase gates and employ pulse modulation to improve the gate robustness against different sources of noise. Parametric driving of a cavity is introduced to induce Rabi interactions between the cavity and qutrits, and then a two-qubit arbitrary phase gate is constructed by designing proper logical states. On this basis, we implement amplitude-shaped gates to obtain enhanced resilience to control errors in gate time and frequency detuning. By virtue of specifically designed logical states, the scheme displays intrinsic resistance to the energy relaxations of qutrits. Furthermore, we show that the gate robustness against cavity decay can be enhanced significantly with amplitude modulation.