Eur. Phys. J. D (2012) 66: 307
https://doi.org/10.1140/epjd/e2012-30394-7

Regular Article

Quantum gate operations in hybrid superconducting circuit

Laboratory of Nanophotonic Functional Materials and Devices, SIPSE & LQIT, South China Normal University, Guangzhou 510006, P.R. China

^a e-mail: wchq2005tj@163.com

Received: 23 June 2012
Received in final form: 19 September 2012
Published online: 4 December 2012

Abstract

We propose several schemes for quantum gate operations in the hybrid superconducting circuit. In these schemes, the gate operations can be easily carried out by adjusting some parameters. The advantage of our scheme can be shown by a particular structure design, which includes a large Josephson-junction coupling between two charge qubits and a crossing current coupling between two charge qubits and a flux qubit. Using our proposal, the pure σ_xσ_x coupling can be conveniently implemented for generating quantum phase gates. Moreover, since both charge qubits and flux qubit can be adjusted to work at the degeneracy points, these gate operations can greatly suppress charge noise and flux fluctuation.