Spectroscopy of three strongly coupled flux qubits

Abstract

We have carried out spectroscopic measurements of a system of three strongly coupled four-junction flux qubits. The samples studied cover a wide range of parameters with the coupling energy between neighboring qubits varying between 0.75 GHz and 6.05 GHz. The observed complicated spectra agree well with eight-level theory. The experiments are relevant for the realization of a tunable coupling between qubits.

References in corpus (15)

• Manipulating the Quantum State of an Electrical Circuit
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Quantum oscillations in two coupled charge qubits
• Demonstration of conditional gate operation using superconducting charge qubits
• Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
• Decoherence of flux qubits due to 1/f flux noise
• Dephasing of a superconducting qubit induced by photon noise
• Spectroscopy on two coupled flux qubits
• Parametric coupling for superconducting qubits
• Protocol for universal gates in optimally biased superconducting qubits
• Tunable coupling scheme for flux qubits at the optimal point
• Coherent oscillations in a superconducting multi-level quantum system
• Four-qubit device with mixed couplings
• Switchable resonant coupling of flux qubits
• Evidence of two-dimensional macroscopic quantum tunneling of a current-biased DC-SQUID

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• Observing pure effects of counter-rotating terms without ultrastrong coupling: A single photon can simultaneously excite two qubits
• Resonant excitations of single and two-qubit systems coupled to a tank circuit
• Efficient purification protocols using iSWAP gates in solid-state qubits
• Quantum Simulation Architecture for Lattice Bosons in Arbitrary, Tunable External Gauge Fields
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• Enhanced-Fidelity Ultrafast Geometric Quantum Computation Using Strong Classical Drives
• Stationary entanglement in strongly coupled qubits
• Superconducting qubit circuit emulation of a vector spin-1/2
• Implementation of standard quantum error correction codes for solid-state qubits
• Quantum resources of the steady-state of three coupled qubits: Microscopic versus Phenomenological model
• Energies and Entanglement in Multiply-coupled Phase Qubit Systems
• Modeling Three and Four Coupled Phase Qubits