Coupling qubits in circuit-QED cavities connected by a bridge qubit
arXiv:1512.09218 · doi:10.1103/PhysRevA.93.012321
Abstract
We analyze a coupling scheme for qubits in different cavities of circuit-QED architecture. In contrast to the usual scheme where the cavities are coupled by an interface capacitance we employ a bridge qubit connecting cavities to mediate two-qubit coupling. This active coupling scheme makes it possible to switch on/off and adjust the strength of qubit-qubit coupling, which is essential for scalability of quantum circuit. By transforming the Hamiltonian we obtain an exact expression of two-qubit coupling in the rotating-wave approximation. For the general case of qubits the Hamiltonian can produce the W state as an eigenstate of the system. We calculate the decay rate of the coupled qubit-resonator system to find that it is viable in real experiments.
7 pages, 5 figures, some typos are corrected
References in corpus (12)
- Charge insensitive qubit design derived from the Cooper pair box
- Coupling Superconducting Qubits via a Cavity Bus
- Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
- Quantum information processing with circuit quantum electrodynamics
- Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
- Photon-mediated interactions between distant artificial atoms
- Time-reversal symmetry breaking in circuit-QED based photon lattices
- Low-Disorder Microwave Cavity Lattices for Quantum Simulation with Photons
- A superconducting qubit with Purcell protection and tunable coupling
- Non-equilibrium delocalization-localization transition of photons in circuit QED
- Demonstrating W-type Entanglement of Dicke-States in Resonant Cavity Quantum Electrodynamics
- Circuit QED and sudden phase switching in a superconducting qubit array
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