Dynamical decoupling of superconducting qubits

TL;DR

This paper presents a method to dynamically decouple superconducting qubits from unwanted interactions using microwave fields, improving quantum processor fidelity and addressing qubit-TLS issues.

Contribution

It introduces a microwave-based decoupling technique for superconducting qubits and analyzes its effectiveness in various coupling scenarios.

Findings

Decoupling of qubits via microwave excitations is feasible.

Simulation shows reduction of spurious qubit interactions.

Discussion of qubit-TLS coupling impacts on measurements.

Abstract

We show that two superconducting qubits interacting via a fixed transversal coupling can be decoupled by appropriately-designed microwave feld excitations applied to each qubit. This technique is useful for removing the effects of spurious interactions in a quantum processor. We also simulate the case of a qubit coupled to a two-level system (TLS) present in the insulating layer of the Josephson junction of the qubit. Finally, we discuss the qubit-TLS problem in the context of dispersive measurements, where the qubit is coupled to a resonator.