Physics – Condensed Matter – Superconductivity
Scientific paper
2010-06-17
Physics
Condensed Matter
Superconductivity
12 Pages and 12 Figures Phys. Rev. B (in press)
Scientific paper
10.1103/PhysRevB.82.134522
The device for the Josephson flux qubit (DJFQ) can be considered as a solid state artificial atom with multiple energy levels. When a large amplitude harmonic excitation is applied to the system, transitions at the energy levels avoided crossings produce visible changes in the qubit population over many driven periods that are accompanied by a rich pattern of interference phenomena. We present a Floquet treatment of the periodically time-dependent Schr\"odinger equation of the strongly driven qubit beyond the standard two levels approach. For low amplitudes, the average probability of a given sign of the persistent current qubit exhibits, as a function of the static flux detuning and the driving amplitude, Landau-Zener-St\"uckelberg interference patterns that evolve into complex diamond-like patterns for large amplitudes. In the case of highly coherent flux qubits we find that the higher order diamonds can not be simply described relying on a two-level approximations. In addition we propose a new spectroscopic method based on starting the system in the first excited state instead of in the ground state, which can give further information on the energy level spectrum and dynamics in the case of highly coherent flux qubits. We compare our numerical results with recent experiments that perform amplitude spectroscopy to probe the energy spectrum of the artificial atom.
Dominguez Daniel
Ferron Alejandro
Sanchez Maria Jose
No associations
LandOfFree
Large Amplitude Harmonic Driving of Highly Coherent Flux Qubits does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Large Amplitude Harmonic Driving of Highly Coherent Flux Qubits, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large Amplitude Harmonic Driving of Highly Coherent Flux Qubits will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-552386