A superconducting flux qubit can be manipulated by a fast modification of its potential, with a rapid transition from a double well to a single well shape, and coming back to the initial condition. This mechanism is based on a non-trivial quantum phenomenon, involving "partial" Landau-Zener transitions, coherent evolution in an harmonic potential and quantum interference. The study of this system enables a deep insight in decoherence mechanisms typical of superconducting qubits. Moreover, this procedure allows quantum operations with extreme high speeds, not possible with other standard manipulations. We present the experimental observation of coherent oscillations showing tunable frequencies with a 65 GHz top value. © Published under licence by IOP Publishing Ltd.
Observation of 65 GHz coherent oscillation in a superconducting flux qubit manipulated by pulses / Chiarello, Fabio; P., Carelli; M. G., Castellano; Cosmelli, Carlo; Torrioli, Guido. - STAMPA. - 507:(2014), pp. 0-4. (Intervento presentato al convegno 11th European Conference on Applied Superconductivity, EUCAS 2013 tenutosi a Genoa nel 15 September 2013 through 19 September 2013) [10.1088/1742-6596/507/4/042006].
Observation of 65 GHz coherent oscillation in a superconducting flux qubit manipulated by pulses
CHIARELLO, FABIO;COSMELLI, Carlo;TORRIOLI, GUIDO
2014
Abstract
A superconducting flux qubit can be manipulated by a fast modification of its potential, with a rapid transition from a double well to a single well shape, and coming back to the initial condition. This mechanism is based on a non-trivial quantum phenomenon, involving "partial" Landau-Zener transitions, coherent evolution in an harmonic potential and quantum interference. The study of this system enables a deep insight in decoherence mechanisms typical of superconducting qubits. Moreover, this procedure allows quantum operations with extreme high speeds, not possible with other standard manipulations. We present the experimental observation of coherent oscillations showing tunable frequencies with a 65 GHz top value. © Published under licence by IOP Publishing Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
