Direct Josephson coupling between superconducting flux qubits
arXiv:cond-mat/0501085 · doi:10.1103/PhysRevB.72.020503
Abstract
We have demonstrated strong antiferromagnetic coupling between two three-junction flux qubits based on a shared Josephson junction, and therefore not limited by the small inductances of the qubit loops. The coupling sign and magnitude were measured by coupling the system to a high-quality superconducting tank circuit. Design modifications allowing to continuously tune the coupling strength and/or make the coupling ferromagnetic are discussed.
REVTeX 4, 4 pages, 5 figures; v2: completely rewritten, added finite-temperature results and proposals for ferromagnetic galvanic coupling
References in corpus (10)
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- Spectroscopy on two coupled flux qubits
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- Entangling flux qubits with a bipolar dynamic inductance
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Cited by in corpus (31)
- Controllable coupling of superconducting flux qubits
- Controllable coupling between flux qubits
- Protected quantum computation with multiple resonators in ultrastrong coupling circuit QED
- Quantum memory using a hybrid circuit with flux qubits and NV centers
- Consistency of ground state and spectroscopic measurements on flux qubits
- Four-qubit device with mixed couplings
- Nonequilibrium phases in hybrid arrays with flux qubits and NV centers
- Coexistence of multi-photon processes and longitudinal couplings in superconducting flux qubits
- Amplitude spectroscopy of two coupled qubits
- Measurement crosstalk between two phase qubits coupled by a coplanar waveguide
- Multiphoton transitions in Josephson-junction qubits (Review Article)
- Resonant excitations of single and two-qubit systems coupled to a tank circuit
- Ideal Quantum Nondemolition Readout of a Flux Qubit Without Purcell Limitations
- Quantum Simulation Architecture for Lattice Bosons in Arbitrary, Tunable External Gauge Fields
- Spectroscopy of a Qubit Array via a Single Transmission Line
- On the generation of multipartite entangled states in Josephson architectures
- Variable-frequency-controlled coupling in charge qubit circuits: Effects of microwave field on qubit-state readout
- Multiphoton excitations and inverse population in two-flux-qubit system
- Parametric amplification by coupled flux qubits
- Adiabatic quantum computation with flux qubits, first experimental results
- Dissipative dynamics of a two-qubit system: Four-level lasing
- Two-qubit parametric amplifier: large amplification of weak signals
- Measurement of the ground-state flux diagram of three coupled qubits as a first step towards the demonstration of adiabatic quantum computation
- Simulating long-distance entanglement in quantum spin chains by superconducting flux qubits
- Stationary entanglement in strongly coupled qubits
- Controllable Coupling in Phase-Coupled Flux Qubits
- Quantum theory of the low-frequency linear susceptibility of interferometer-type superconducting qubits
- Normal modes of a superconducting transmission-line resonator with embedded lumped element circuit components
- Broadband noise decoherence in solid-state complex architectures
- Diffusion and transfer of entanglement in an array of inductively coupled flux qubits
- Effects of Strong Capacitive Coupling Between Meta-Atoms in rf SQUID Metamaterials