Département de physique | Université de Sherbrooke

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Prochains séminaires

mar, 05/21/2013 - 12:30

Gabriel Poulin-Lamarre
- 12:30
- D3-2040
- To be announced
- Voir Google Calendar

lun, 05/27/2013 - 12:30

Susanne Butz, Physikalisches Institut, Karlsruhe Institute of Technology, Karlsruhe, Germany.
- 12:30
- D3-2040
- Title: A Tunable Josephson Metamaterial
  
  Abstract: We present experimental data on a tunable magnetic metamaterial consisting of rf-SQUIDs. A metamaterial is a medium constructed of artifical elements, so- called meta-atoms, that interact in a specific way with an incoming electromagnetic wave. The size of and the distance between the individual meta-atoms is much smaller than the wavelength. Our metamaterial consists of one-dimensional arrays of 27 rf-SQUIDs, one chain placed inside each of the gaps of a coplanar waveguide. Due to the nonlinear inductance of the rf-SQUID, its resonance frequency is tunable in situ by applying a dc magnetic field. We demonstrate that this results in tunable effective parameters of our metamaterial. In order to obtain the effective magnetic permeability from the measured data, we employ a technique that uses only the complex transmission coefficient S21.
- Voir Google Calendar

lun, 06/03/2013 - 12:30

Bhaskar Roy Bardhan, Department of Physics and Astronomy, Louisiana State University
- 12:30
- D3-2040
- To be annonced
- Voir Google Calendar

mer, 06/05/2013 - 10:45

INTRIQ : Lilian Childress, McGill
- 10:45
- D1-2165
- Title: Spins and photons: toward quantum networks in diamond
  
  Abstract: Long-lived electronic and nuclear spin states have made nitrogen-vacancy (NV) defects in diamond a leading candidate for solid-state quantum information processing. Moreover, their coherent optical transitions open opportunities for quantum communication. This talk will consider the motivation and requirements for optically-networked quantum devices, and explore challenges and opportunities for realizing them in diamond. In particular, the resonant excitation and emission in these defect centers enables single shot spin detection as well as observation of two-photon quantum interference; these two capabilities have enabled measurement-based entanglement between remote NV centers.
- Voir Google Calendar

lun, 06/10/2013 - 12:30

Frank Verstraete , Université de Vienne
- 12:30
- D3-2040
- To be announced
- Voir Google Calendar

Slichter DH, Vijay R, Weber SJ, Boutin S, Boissonneault M, Gambetta JM, et al. Measurement-Induced Qubit State Mixing in Circuit QED from Up-Converted Dephasing Noise. Phys. Rev. Lett.. 2012;109:153601.

Boissonneault M, Blais A, Gambetta JM. Improved qubit bifurcation readout in the straddling regime of circuit QED. Phys. Rev. A. 2012;86:022326.

Bourassa J, Beaudoin F, Gambetta JM, Blais A. Josephson junction-embedded transmission-line resonators: from Kerr medium to in-line transmon.; 2012. Abstract

Gambetta JM, Houck AA, Blais A. Superconducting qubit with purcell protection and tunable coupling. Phys. Rev. Lett.. 2011;106:030502.

Lalumiere K, Gambetta JM, Blais A. Tunable joint measurements in the dispersive regime of cavity QED. Physical Review A. 2010;81:301. Abstract

Boissonneault M, Gambetta JM, Blais A. Improved Superconducting Qubit Readout by Qubit-Induced Nonlinearities.. 2010.

Hutchison CL, Gambetta JM, Blais A, Wilhelm FK. Quantum trajectory equation for multiple qubits in circuit QED: Generating entanglement by measurement. Canadian Journal of Physics. 2009;87:225-31.

Boissonneault M, Gambetta JM, Blais A. Dispersive regime of circuit QED: Photon-dependent qubit dephasing and relaxation rates. Physical Review A. 2009;79.

Dicarlo L, Chow JM, Gambetta JM, Bishop LS, Johnson BR, Schuster DI, et al. Demonstration of two-qubit algorithms with a superconducting quantum processor. Nature. 2009;460:240-4.

Bourassa J, Gambetta JM, Abdumalikov AA, Astafiev O, Nakamura Y, Blais A. Ultrastrong coupling regime of cavity QED with phase-biased flux qubits. Physical Review A. 2009;80.

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