Carsten Hutter et al 2006 Europhys. Lett. 74 1088 doi:10.1209/epl/i2006-10054-4
Carsten Hutter1, Alexander Shnirman1, Yuriy Makhlin2 and Gerd Schön1
Show affiliationsWe 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.
03.67.Lx Quantum computation architectures and implementations
85.25.Hv Superconducting logic elements and memory devices; microelectronic circuits
Issue 6 (June 2006)
Received 6 February 2006, accepted for publication 21 April 2006, in final form 21 April 2006
Published 17 May 2006
Carsten Hutter et al 2006 Europhys. Lett. 74 1088
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