Volume 74, Number 6, June 2006
|Page(s)||1088 - 1094|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||17 May 2006|
Tunable coupling of qubits: Nonadiabatic corrections
Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe D-76128 Karlsruhe, Germany
2 Landau Institute for Theoretical Physics - Kosygin st. 2, 119334 Moscow, Russia
Accepted: 21 April 2006
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.
PACS: 85.25.Hv – Superconducting logic elements and memory devices; microelectronic circuits / 03.67.Lx – Quantum computation
© EDP Sciences, 2006
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