High-fidelity quantum operations on superconducting qubits in the presence of noise

TL;DR

This paper introduces a scheme for high-fidelity quantum operations on superconducting qubits that effectively mitigates noise effects, achieving very low error probabilities through innovative pulse sequences and system design.

Contribution

The work presents a novel approach combining a coupler qubit, noise-mitigating pulse sequences, and a high-Q resonator to perform universal quantum gates with ultra-low error rates.

Findings

Achieved gate error probabilities of approximately 10^-5 under realistic noise conditions.

Developed a Monte-Carlo simulation method for noise-induced dephasing and decay.

Quantified decay times needed to sustain low error levels in superconducting qubits.

Abstract

We present a scheme for implementing quantum operations with superconducting qubits. Our approach uses a "coupler" qubit to mediate a controllable, secular interaction between "data" qubits, pulse sequences which strongly mitigate the effects of 1/f flux noise, and a high-Q resonator-based local memory. We develop a Monte-Carlo simulation technique capable of describing arbitrary noise-induced dephasing and decay, and demonstrate in this system a set of universal gate operations with O(10^-5) error probabilities in the presence of experimentally measured levels of 1/f noise. We then add relaxation and quantify the decay times required to maintain this error level.