Entanglement generation and quantum information transfer between spatially-separated qubits in different cavities

Abstract

The generation and control of quantum states of spatially-separated qubits distributed in different cavities constitute fundamental tasks in cavity quantum electrodynamics. An interesting question in this context is how to prepare entanglement and realize quantum information transfer between qubits located at different cavities, which are important in large-scale quantum information processing. In this paper, we consider a physical system consisting of two cavities and three qubits. Two of the qubits are placed in two different cavities while the remaining one acts as a coupler, which is used to connect the two cavities. We propose an approach for generating quantum entanglement and implementing quantum information transfer between the two spatially-separated intercavity qubits. The quantum operations involved in this proposal are performed by a virtual photon process, and thus the cavity decay is greatly suppressed during the operations. In addition, to complete the present tasks, only one coupler qubit and one operation step are needed. Moreover, there is no need of applying classical pulses, so that the engineering complexity is much reduced and the operation procedure is greatly simplified. Finally, our numerical results illustrate that high-fidelity implementation of this proposal using superconducting phase qubits and one-dimenstion transmision line resonators is feasible for current circuit QED implementations. This proposal can also be applied to other types of superconducting qubits, including flux and charge qubits.

10 pages, 4 figures

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• Multiplex-controlled phase gate with qubits distributed in a multi-cavity system
• Entanglement generation in a quantum network with finite quantum memory lifetime
• Quantum simulation of clustered photosynthetic light harvesting in a superconducting quantum circuit
• Generation of quantum entangled states of multiple groups of qubits distributed in multiple cavities
• Symmetry and its breaking in path integral approach to quantum Brownian motion
• Scalable quantum information transfer between nitrogen-vacancy-center ensembles
• Non equilibrium dynamics of an optomechanical Dicke model
• Multiphoton controllable transport between remote resonators
• Transferring entangled states of photonic cat-state qubits in circuit QED