Bulletin of the American Physical Society
APS March Meeting 2013
Volume 58, Number 1
Monday–Friday, March 18–22, 2013; Baltimore, Maryland
Session T10: Invited Session: Superconducting Qubits
8:00 AM–11:00 AM,
Thursday, March 21, 2013
Sponsoring Units: GQI DCMP
Chair: Matthias Steffen, IBM
Abstract ID: BAPS.2013.MAR.T10.2
Abstract: T10.00002 : Recent progress of the fluxonium qubit*
8:36 AM–9:12 AM
Preview Abstract Abstract
(Applied Physics Department, Yale University)
Superconducting artificial atoms are all based on the purely dispersive non-linearity of a Josephson tunnel junction, which provides anharmonicity for a microwave oscillator mode. In the fluxonium qubit , the microwave oscillator crucially involves a superinductor, built with a linear array of several tens of ``large'' Josephson junctions. As the flux threading the loop formed by the superinductor and the tunnel junction is swept from zero to half a flux quantum, the g-e transition frequency varies between a sweet spot around 10GHz and another sweet spot at a few hundreds of MHz. By optimizing the fabrication and parameters of this superinductor , we have eliminated spurious phase slips through the array, and ensured that its self-resonance frequency lies above the frequency of the qubit. The improved relaxation times of this multi-junction circuit are promising for the design of a novel mesoscopic artificial atom, in which large anharmonicity, long coherence times and fast coupling rate to a cavity bus would all be compatible.\\[4pt]  Manucharyan et al., Science 326, 113 (2009) and Phys. Rev. B 85, 024521 (2012).\\[0pt]  Masluk et al., Phys. Rev. Lett. 109, 137002 (2012).
*Work supported by IARPA, ARO, NSF and YINQE.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2013.MAR.T10.2
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