Tunable coupling in circuit quantum electrodynamics with a superconducting V-system

Abstract

Recent progress in superconducting qubits has demonstrated the potential of these devices for the future of quantum information processing. One desirable feature for quantum computing is independent control of qubit interactions as well as qubit energies. We demonstrate a new type of superconducting charge qubit that has a V-shaped energy spectrum and uses quantum interference to provide independent control over the qubit energy and dipole coupling to a superconducting cavity. We demonstrate dynamic access to the strong coupling regime by tuning the coupling strength from less than 200 kHz to more than 40 MHz. This tunable coupling can be used to protect the qubit from cavity-induced relaxation and avoid unwanted qubit-qubit interactions in a multi-qubit system.

5 pages, 4 figures

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• Tunable and Switchable Coupling Between Two Superconducting Resonators
• Fast universal quantum gates on microwave photons with all-resonance operations in circuit QED
• Many-Body Interactions with Tunable-Coupling Transmon Qubits
• Dynamical correlation functions and the quantum Rabi model
• The upside of noise: engineered dissipation as a resource in superconducting circuits
• Quantum information processing on nitrogen-vacancy ensembles with the local resonance assisted by circuit QED
• Parity-dependent State Engineering and Tomography in the ultrastrong coupling regime
• Digital-analog quantum simulation of generalized Dicke models with superconducting circuits
• Tunable-Cavity QED with Phase Qubits
• Quantum phase transition in a multi-connected superconducting Jaynes-Cummings lattice
• $Z_N$ symmetric chiral Rabi model: a new $N$-level system
• Quantum teleportation with continuous measurements
• Site-wise manipulations and Mott insulator-superfluid transition of interacting photons using superconducting circuit simulators
• Analytical comparison of the first- and second-order resonances for implementation of the dynamical Casimir effect in nonstationary circuit QED
• Parametrically driven hybrid qubits-photon systems: dissipation-induced quantum entanglement and photon production from vacuum
• Parametric four-wave mixing toolbox for superconducting resonators
• Three-qubit direct dispersive parity measurement with Tunable Coupling Qubits
• Multi-qubit Quantum Rabi Model and Multi-partite Entangled States in a Circuit QED System
• Mott insulator-superfluid phase transition in a detuned multi-connected Jaynes-Cummings lattice