Spectroscopy of superconducting charge qubits coupled by a Josephson inductance
arXiv:0802.0353 · doi:10.1103/PhysRevB.77.064505
Abstract
We have designed and experimentally implemented a circuit of inductively-coupled superconducting charge qubits, where a Josephson junction is used as an inductance, and the coupling between the qubits is controlled by an applied magnetic flux. Spectroscopic measurements on the circuit are in good agreement with theoretical calculations. We observed anticrossings which originate from the coupling between the qubit and the plasma mode of the Josephson junction. Moreover, the size of the anticrossing depends on the external magnetic flux, which demonstrates the controllability of the coupling.
Accepted for publication in PRB. 11 pages, 7 figures
References in corpus (17)
- Coupling Superconducting Qubits via a Cavity Bus
- Superconducting Circuits and Quantum Information
- Coherent quantum state storage and transfer between two phase qubits via a resonant cavity
- Decoherence of flux qubits due to 1/f flux noise
- Spectroscopy on two coupled flux qubits
- Controllable coupling of superconducting flux qubits
- Microwave-induced coupling of superconducting qubits
- Dephasing of a superconducting flux qubit
- Parametric coupling for superconducting qubits
- Tunable coupling scheme for flux qubits at the optimal point
- Interqubit coupling mediated by a high-excitation-energy quantum object
- Four-qubit device with mixed couplings
- Switchable resonant coupling of flux qubits
- Mediated tunable coupling of flux qubits
- Generalized switchable coupling for superconducting qubits using double resonance
- Switchable coupling for superconducting qubits using double resonance in the presence of crosstalk
- Stability of longitudinal coupling for Josephson charge qubits