Tunable coupling of qubits: nonadiabatic corrections

Details Tunable coupling of qubits: nonadiabatic corrections Tunable coupling of qubits: nonadiabatic corrections

2006-02-03

arxiv.org/abs/cond-mat/0602086v2

Europhys. Lett. 74, 1088 (2006).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 2 figures, accepted in Europhysics Letters

Scientific paper

10.1209/epl/i2006-10054-4

We analyze the coupling of qubits mediated by a tunable and fast element beyond the adiabatic approximation. The nonadiabatic corrections are important and even dominant in parts of the relevant parameter range. As an example, we consider the tunable capacitive coupling between two charge qubits mediated by a gated Josephson junction, as suggested by Averin and Bruder. The nonadiabatic, inductive contribution persists when the capacitive coupling is tuned to zero. On the other hand, the total coupling can be turned off (in the rotating wave approximation) if the qubits are operated at symmetry points.

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