A new flux/phase qubit with integrated readout

We propose a new scheme for a flux/phase qubit, based on a double-SQUID modified to achieve a direct readout of the flux state. The readout is performed by inserting a large Josephson junction in the SQUID loop; the junction is biased by an external current and switches from the zero-voltage to the...

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Veröffentlicht in:	IEEE transactions on applied superconductivity 2005-06, Vol.15 (2), p.849-851
Hauptverfasser:	Castellano, M.G., Chiarello, F., Leoni, R., Torrioli, G., Carelli, P., Cosmelli, C., Di Bucchianico, M., Mattioli, F., Poletto, S., Simeone, D.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Circuit properties Couplings Critical current Devices Electric, optical and optoelectronic circuits Electronic circuits Electronics Exact sciences and technology Flux Inductance Josephson Josephson junctions Magnetic flux Niobium Quantum computing qubit Qubits (quantum computing) Running SQUID SQUIDs Superconductivity Switches Switching, multiplexing, switched capacity circuits
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Beschreibung
Zusammenfassung:	We propose a new scheme for a flux/phase qubit, based on a double-SQUID modified to achieve a direct readout of the flux state. The readout is performed by inserting a large Josephson junction in the SQUID loop; the junction is biased by an external current and switches from the zero-voltage to the running state depending on the flux state of the qubit. We report recent results concerning the theoretical behavior and the experimental characterization at 4.2 K of the device, which has been realized with Nb/AlOx/Nb trilayer technology.
ISSN:	1051-8223 1558-2515
DOI:	10.1109/TASC.2005.850080