Dispersive Manipulation of Paired Superconducting Qubits

TL;DR

This paper presents a method for robust quantum information processing using paired superconducting qubits, leveraging dispersive interactions and encoding to achieve universal gates within a decoherence-free subspace.

Contribution

It introduces a novel approach combining qubit encoding with dispersive dynamics to enable universal gates and decoherence protection in superconducting qubits.

Findings

Establishment of a decoherence-free subspace for paired superconducting qubits.

Implementation of universal quantum gates through dispersive interactions.

Enhanced robustness of quantum operations with simple control requirements.

Abstract

We combine the ideas of qubit encoding and dispersive dynamics to enable robust and easy quantum information processing (QIP) on paired superconducting charge boxes sharing a common bias lead. We establish a decoherence free subspace on these and introduce universal gates by dispersive interaction with a LC resonator and inductive couplings between the encoded qubits. These gates preserve the code space and only require the established local symmetry and the control of the voltage bias.