Protecting quantum gates from arbitrary single- and two-qubit errors

TL;DR

This paper introduces a dynamical decoupling technique combining specific pulse sequences to protect quantum gates from arbitrary single- and two-qubit errors, adaptable to various physical systems.

Contribution

It presents a novel concatenated pulse sequence method that effectively suppresses both single- and two-qubit errors in quantum gates, enhancing quantum information stability.

Findings

Numerical simulations show effective error suppression under dynamic error conditions.

The method is adaptable to different physical systems like trapped ions and superconducting qubits.

The approach improves the fidelity of quantum gates against arbitrary errors.

Abstract

We explore the protection of quantum gates from arbitrary single- and two-qubit noises with properly designed dynamical decoupling pulses. The proposed dynamical decoupling method is a concatenation of a sequence of pulses formed by $\sigma_x$, $\sigma_x\sigma_x$ with another sequence constructed by $\sigma_z$, $\sigma_z\sigma_z$. The concatenation of the two sequences results in desired pulses to fight agianst any single- and two-qubit errors. The success of our method relies on the ability to adjust system parameters or interaction terms, which can be achieved in different physical systems, including trapped ions and superconducting qubits. We finally explore the performance of our method numerically with the above-mentioned errors that are changing at any moment and show the preferred protection offered by the method. Therefore, our method is a timely step forward in preserving quantum gates at the level of physical qubits.