超导量子比特的可调耦合

Tunable coupling of superconducting qubits.

作者信息

Blais Alexandre, van den Brink Alexander Maassen, Zagoskin Alexandre M

机构信息

Département de Physique and Centre de Recherche sur les Propriétés Electroniques de Matériaux Avancés, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1.

出版信息

Phys Rev Lett. 2003 Mar 28;90(12):127901. doi: 10.1103/PhysRevLett.90.127901. Epub 2003 Mar 24.

DOI:10.1103/PhysRevLett.90.127901

PMID:12688899

Abstract

We study an LC circuit implemented using a current-biased Josephson junction (CBJJ) as a tunable coupler for superconducting qubits. By modulating the bias current, the junction can be tuned in and out of resonance and entangled with the qubits coupled to it. One can thus implement two-qubit operations by mediating entanglement. We consider the examples of CBJJ and charge-phase qubits. A simple recoupling scheme leads to a generalization to arbitrary qubit designs.

摘要

我们研究了一种使用电流偏置约瑟夫森结（CBJJ）实现的LC电路，该电路作为超导量子比特的可调耦合器。通过调制偏置电流，可以使该结调谐进入和离开共振状态，并与耦合到它的量子比特纠缠。因此，可以通过介导纠缠来实现双量子比特操作。我们考虑了CBJJ和电荷-相位量子比特的例子。一种简单的重新耦合方案可以推广到任意量子比特设计。