Session J33: Focus Session: Superconducting Qubits II

11:15 AM–2:03 PM, Tuesday, March 6, 2007
Colorado Convention Center - 403

Sponsoring Unit: GQI
Chair: John Martinis, University of California, Santa Barbara

Abstract ID: BAPS.2007.MAR.J33.9

Abstract: J33.00009 : Microwave-Induced Cooling of a Superconducting Persistent-Current Qubit

12:51 PM–1:03 PM

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Authors:

  Sergio Valenzuela
    (MIT)

  William Oliver
    (MIT Lincoln Laboratory)

  David Berns
  Karl Berggren
  Leonid Levitov
  Terry Orlando

We present the experimental demonstration of microwave-induced cooling of a persistent-current qubit. Our qubit is a multi-level artificial atom. Thermal population of the first-excited qubit state is driven to a higher-excited state, from which it preferentially relaxes to the qubit ground state. Cooling is realized, because the driving-induced population transfer to the ground state is faster than the thermal repopulation of the excited state. We achieve effective qubit temperatures < 3 mK, a factor 10x-100x lower than the dilution refrigerator ambient temperature. This talk will present and discuss these experimental results. [1] S.O. Valenzuela, W.D. Oliver, D.M. Berns, et al., Science (2006).

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.MAR.J33.9