Analysis of a tunable coupler for superconducting phase qubits
Journal article, 2010

This paper presents a theoretical analysis of the recently realized tunable coupler for superconducting phase qubits [R. C. Bialczak et al., arXiv: 1007.2219 (unpublished)]. The coupling can be turned off by compensating a negative mutual inductance with a tunable Josephson inductance. The main coupling in this system is of the XX type and can be zeroed exactly, while there is also a small undesired contribution of the ZZ type. We calculate both couplings as functions of the tuning parameter (bias current) and focus on the residual coupling in the OFF regime. In particular, we show that for typical experimental parameters the coupling OFF/ON ratio is few times 10(-3), and it may be zeroed by proper choice of parameters. The remaining errors due to physical presence of the coupler are on the order of 10(-6).

state

decoherence

Author

R. A. Pinto

A. N. Korotkov

M. R. Geller

Vitaly Shumeiko

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

J. M. Martinis

Physical Review B - Condensed Matter and Materials Physics

1098-0121 (ISSN)

Vol. 82 10 104522-

Areas of Advance

Information and Communication Technology

Subject Categories

Physical Sciences

Roots

Basic sciences

DOI

10.1103/PhysRevB.82.104522

More information

Created

10/6/2017