Tunable coupling of qubits: Nonadiabatic corrections

2006/02/28 by Carsten Hutter, Alexander Shnirman, Yuriy Makhlin +1 · 3 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum optics and atomic interactions #cond-mat.mes-hall

paper · pdf · doi:10.1209/epl/i2006-10054-4

published as Europhys. Lett. 74, 1088 (2006). · 7 pages, 2 figures, accepted in Europhysics Letters

arxiv created 2006/05/12 · openalex publication_date 2006/05/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30

Abstract

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.

Citations

• Quantum Manipulations of Small Josephson Junctions
• Demonstration of conditional gate operation using superconducting charge qubits
• Scalable Quantum Computing with Josephson Charge Qubits
• Spectroscopy on Two Coupled Superconducting Flux Qubits
• Josephson-junction qubits with controlled couplings
• Cavity quantum electrodynamics for superconducting electrical circuits: An architecture for quantum computation
• Variable Electrostatic Transformer: Controllable Coupling of Two Charge Qubits

Cited by

• Spin dephasing due to a random Berry phase
• Geometrical Spin Dephasing in Quantum Dots
• Interqubit coupling mediated by a high-excitation-energy quantum object