### Session P40: Focus Session: Pathways to Practical Quantum Computing I

11:15 AM–2:15 PM, Wednesday, March 15, 2006
Baltimore Convention Center Room: 343

Sponsoring Units: DCOMP TGQI
Chair: Gerardo Ortiz, Los Alamos National Laboratory

Abstract ID: BAPS.2006.MAR.P40.5

### Abstract: P40.00005 : Towards single shot read-out in circuit quantum electrodynamics (QED)

12:27 PM–12:39 PM

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#### Authors:

Andreas Wallraff
David Schuster
Alexandre Blais
Jay Gambetta
Luigi Frunzio
Joe Schreier
Blake Johnson
Andrew Houck
Will Braff
Hannes Majer
Michel Devoret
Steve Girvin
Rob Schoelkopf
(Depts. of Applied Physics and Physics, Yale University)

In recent experiments we have demonstrated the resonant coherent coupling of individual photons to a single qubit implemented as a Cooper pair box in a high quality superconducting cavity [1]. In the non-resonant case, the dispersive coupling between the qubit and the cavity field is used to perform quantum non-demolition (QND) measurements of the qubit state [2]. Using this read-out technique we have performed high visibility measurements of Rabi oscillations and Ramsey fringes [3]. Here we present a detailed experimental and theoretical analysis of the cavity response for continuous and pulsed measurements in a wide range of cavity drive amplitudes. We also discuss an optimal read-out strategy for qubits in a continuous QND measurement and aim at demonstrating single shot read-out in the circuit QED architecture [4].\\ \\ $[1]$ A. Wallraff et al. Nature (London) 431, 162 (2004)\\ $[2]$ D. I. Schuster et al. Phys. Rev. Lett. 94, 123602 (2005)\\ $[3]$ A. Wallraff et al. Phys. Rev. Lett. 95, 060501 (2005)\\ $[4]$ A. Blais et al. Phys. Rev. A 69, 062320 (2004)\\

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.MAR.P40.5