Entangling superconducting qubits in a multi-cavity system

Abstract

Important tasks in cavity quantum electrodynamics include the generation and control of quantum states of spatially-separated particles distributed in different cavities. An interesting question in this context is how to prepare entanglement among particles located in different cavities, which are important for large-scale quantum information processing. We here consider a multi-cavity system where cavities are coupled to a superconducting (SC) qubit and each cavity hosts many SC qubits. We show that all intra-cavity SC qubits plus the coupler SC qubit can be prepared in an entangled Greenberger-Horne-Zeilinger (GHZ) state, by using a single operation and without the need of measurements. The GHZ state is created without exciting the cavity modes; thus greatly suppressing the decoherence caused by the cavity-photon decay and the effect of unwanted inter-cavity crosstalk on the operation. We also introduce two simple methods for entangling the intra-cavity SC qubits in a GHZ state. As an example, our numerical simulations show that it is feasible, with current circuit-QED technology, to prepare high-fidelity GHZ states, for up to nine SC qubits by using SC qubits distributed in two cavities. This proposal can in principle be used to implement a GHZ state for {\it an arbitrary number} of SC qubits distributed in multiple cavities. The proposal is quite general and can be applied to a wide range of physical systems, with the intra-cavity qubits being either atoms, NV centers, quantum dots, or various SC qubits.

15 pages, 9 figures, 2 tables

References in corpus (17)

• QuTiP 2: A Python framework for the dynamics of open quantum systems
• Coupling Superconducting Qubits via a Cavity Bus
• Beyond the Jaynes-Cummings model: circuit QED in the ultrastrong coupling regime
• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• 14-qubit entanglement: creation and coherence
• Superconducting Circuits and Quantum Information
• Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
• Effective Hamiltonian Theory and Its Applications in Quantum Information
• Complete universal quantum gate set approaching fault-tolerant thresholds with superconducting qubits
• Possible realization of entanglement, logical gates and quantum information transfer with superconducting-quantum-interference-device qubits in cavity QED
• High-Fidelity Readout in Circuit Quantum Electrodynamics Using the Jaynes-Cummings Nonlinearity
• Using Sideband Transitions for Two-Qubit Operations in Superconducting Circuits
• Deterministic entanglement of photons in two superconducting microwave resonators
• Two-Qubit State Tomography using a Joint Dispersive Read-Out
• Quantum information processing and multiatom entanglement engineering with a thermal cavity
• Quantum two-level systems in Josephson junctions as naturally formed qubits
• Proposal for generating and detecting multi-qubit GHZ states in circuit QED

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