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Prochains séminaires

lun, 05/27/2013 - 12:30

  1. 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.

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lun, 06/03/2013 - 12:30

  1. Bhaskar Roy Bardhan, Department of Physics and Astronomy, Louisiana State University
    • 12:30
    • D3-2040
    • To be annonced

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mer, 06/05/2013 - 10:45

  1. 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.

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lun, 06/10/2013 - 12:30

  1. Frank Verstraete , Université de Vienne
    • 12:30
    • D3-2040
    • To be announced

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mar, 06/11/2013 - 00:00

  1. Wolfgang Belzig, l'Université de Constance, Allemagne
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Fournier P, M.Aubin. Effect of Intergrain Ag on the Magnetic Properties of YBa2Cu3O7 analyzed using the Generalized Critical State Model. In: K.Tachikawa, K.Kitazawa, H.Maeda, T.Matsushita, editors. Critical State in Superconductors. World Scientific; 1995. p. 237-40.
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M.Aubin, Fournier P. Interpretation of the Generalized Critical State Model Parameters from their Temperature Dependences and the Effect of Various Heat treatments in polycrystalline YBa2Cu3O7. Physica C. 1994;235-240:3081-2.
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Fournier P, M.Aubin, LeBlanc MA. Critical-State-Model parameters of polycrystalline YBa2Cu3O7 : Critical Current in Thin Slabs and Field Penetration in Hollow Cylinders. Physical Review B. 1994;50:9548-53.
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Fournier P, M.Aubin. Measuring the Critical Current of High Temperature Superconductors in Liquid Nitrogen as a Function of Temperature. Rev.Sci.Inst.. 1994;65:988.
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Fournier P, M.Aubin. The Critical State Model Parameters of Polycrystalline YBa2Cu3O7 : Critical Current in Thin Slabs and Field Penetration in Hollow Cylinders. Physica C. 1994;235-240:3079-80.
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Fournier P, M.Oussena, M.Aubin. Determination of full penetration field of YBaCuO hollow cylinders by a low Ic YBaCuO superconducting probe : temperature dependence. Cryogenics. 1993;33:333.
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M.Aubin, H.Ghamlouch, Fournier P. Measurement of the Seebeck coefficient by an ac technique: Application to high-temperature superconductors. Rev.Sci.Inst.. 1993;64:2938.
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Fournier P, M.Aubin. The Wall Thickness Dependence of the Full Penetration Field of YBCO Polycristalline Hollow Cylinders and the Generalized Critical State Model. Physica B. 1993;194-196.
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P.Dufour, Jandl S, M.Banville, Fournier P, M.Aubin. Infrared reflectance of YBa2(Cu1-xFex)3O7-u. Physica C. 1991;166:431.
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Fournier P, R.Gagnon, M.Aubin. Variable-Range Hopping in YBa2(Cu1-xMx)3O7-y [M = Fe,Zn]. Physica C. 1991;177:159.
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