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.
A new flux/phase qubit with integrated readout / Cosmelli, Carlo; M., DI BUCCHIANICO; S., Poletto; M. G., Castellano; F., Chiarello; R., Leoni; D., Simeone; G., Torrioli; P., Carelli. - In: IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY. - ISSN 1051-8223. - 15:2 PART I(2005), pp. 849-851. (Intervento presentato al convegno 2004 Applied Superconductivity Conference tenutosi a Jacksonville, FL nel OCT 03-08, 2004) [10.1109/TASC.2005.850080].
A new flux/phase qubit with integrated readout
COSMELLI, Carlo;
2005
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
