Quantum information processing using Josephson junctions coupled through cavities

Abstract

Josephson junctions have been shown to be a promising solid-state system for implementation of quantum computation. The significant two-qubit gates are generally realized by the capacitive coupling between the nearest neighbour qubits. We propose an effective Hamiltonian to describe charge qubits coupled through the cavity. We find that nontrivial two-qubit gates may be achieved by this coupling. The ability to interconvert localized charge qubits and flying qubits in the proposed scheme implies that quantum network can be constructed using this large scalable solid-state system.

5 pages, to appear in Phys Rev A; typos corrected, solutions in last eqs. corrected

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• Simple unconventional geometric scenario of one-way quantum computation with superconducting qubits inside a cavity
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• Quantum computation with Josephson-qubits by using a current-biased information bus
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• Nanomechanical Quantum Memory for Superconducting Qubits
• Entanglement of topological phase factors
• Tunable interaction of superconducting flux qubits in circuit QED
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• Self-Adapted Josephson Oscillation of Dark-Bright Solitons under Constant Forces
• Effects of Resonant Cavity on Macroscopic Quantum Tunneling of Fluxon in Long Josephson Junctions
• Simulation of the Majorana equation in circuit QED
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• Unconditional Bell-type state generation for spatially separate trapped ions
• Preparation of Schrödinger cat states of a cavity field via coupling to a superconducting charge qubit