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Analysis of a tunable coupler for superconducting phase qubits

R. A. Pinto ; A. N. Korotkov ; M. R. Geller ; Vitaly Shumeiko (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; J. M. Martinis
Physical Review B (1098-0121). Vol. 82 (2010), 10, p. 104522.
[Artikel, refereegranskad vetenskaplig]

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of the recently realized tunable coupler for superconducting phase qubits [R. C. Bialczak et al., arXiv: 1007.2219 (unpublished)].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).

Nyckelord: state, decoherence

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Denna post skapades 2010-10-21. Senast ändrad 2011-04-29.
CPL Pubid: 127940


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