Session W39: Superconductivity-Josephson Junctions and Qubits
2:30 PM–5:30 PM, Thursday, March 16, 2006
Baltimore Convention Center Room: 342
Sponsoring Unit:
DCMP
Chair: J. Robert Anderson, University of Maryland
Abstract ID: BAPS.2006.MAR.W39.14
Abstract: W39.00014 : Cavity Josephson Bifurcation Amplifier: a microwave readout for a superconducting qubit
5:06 PM–5:18 PM
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Abstract 
Authors:
Michael Metcalfe
Etienne Boaknin
Vladimir Manucharyan
(Department of Applied Physics, Yale University, New Haven, CT, 06511)
Simon Fissette
(Departement de Physique, Universite de Sherbrooke, Sherbrooke, Canada )
Irfan Siddiqi
Rajamani Vijayaraghavan
Chad Rigetti
Andreas Wallraff
Robert Schoelkopf
Michel Devoret
(Department of Applied Physics, Yale University, New Haven, CT, 06511)
A Josephson junction, embedded in a microwave circuit that displays a resonance, and driven near the resonance frequency by a sinusoidal signal with adequate amplitude, can adopt one of two dynamical metastable states. The transition between the two states can be triggered by a small variation in the environment of the junction. This switching phenomenon naturally lends itself to the readout of a superconducting quantum bit. We are approaching the problem of mapping the two states of a qubit onto the two dynamical states of the Josephson junction by placing it in an on-chip coplanar waveguide superconducting cavity. We present the characterization of the cavity Josephson bifurcation amplifier (CJBA) and show that it follows theoretical predictions over a wide range of operating frequencies and bandwidth. This architecture provides a calculable RF environment which can be readily optimized. We also discuss a multi-resonator chip geometry that would implement the multiplexed readout of more than 10 qubits.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.MAR.W39.14