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Research Group Pop

Dr. Ioan Pop Dr. Ioan Pop


Physikalisches Institut
Wolfgang-Gaede-Str. 1
D-76131 Karlsruhe, Germany

and Institut of Nanotechnology

mail ioan.pop∂kit.edu


PhD: 2011 NEEL Institute, CNRS and University of Grenoble, France
Master degree: 2007 Physics, University of Grenoble, France
Diploma degree: 2006 Physics, Babeș-Bolyai University, Cluj-Napoca, Romania


2011-2015 Postdoctoral researcher, Yale University, USA
2007-2011 NEEL Institute, CNRS, Grenoble, France
2007-2010 Teaching assistant, University of Grenoble, France

We have received the generous support of the Alexander von Humboldt foundation through a Sofja Kovalevskaja Award. 

Fields of research

Our research focuses on superconducting quantum circuits.

Josephson junctions have been proven to be reliable building blocks for superconducting quantum memories, high-speed processing units, amplifiers and detectors, operating in the microwave domain. In these types of electrical circuits, which can be manufactured using standard lithography, currents and voltages can exhibit quantum mechanical properties and can be controlled using microwave pulses. This makes them appealing for the study of fundamental quantum phenomena and the implementation of quantum information processing.

We are currently interested in the design and implementation of quantum circuits protected against decoherence.

PostDocs, PhD and Master students wanted.


Prof. Alexey Ustinov, KIT

Prof. Wolfgang Wernsdorfer, KIT

Selected Publications

  1. Circuit Quantum Electrodynamics of Granular Aluminum Resonators
    N. Maleeva, L. Grünhaupt, T. Klein, F. Levy-Bertrand, O. Dupré, M. Calvo, F. Valenti, P. Winkel, F. Friedrich, W. Wernsdorfer, A. V. Ustinov, H. Rotzinger, A. Monfardini, M. V. Fistul, and I. M. Pop
    Nature Comm. 9, 3889 (2018), doi:10.1038/s41467-018-06386-9, pdf download (ca. 1.1 MB)

  2. Loss Mechanisms and Quasiparticle Dynamics in Superconducting Microwave Resonators Made of Thin-Film Granular Aluminum
    L. Grünhaupt, N. Maleeva, S. T. Skacel, G. Catelani, M. Calvo, F. Levy-Bertrand, A. V. Ustinov, H. Rotzinger, A. Monfardini, and I. M. Pop
    Phys. Rev. Lett. 121, 117001 (2018), doi:10.1103/PhysRevLett.121.117001, pdf download (ca. 1 MB)

  3. Coherent suppression of electromagnetic dissipation due to superconducting quasiparticles
    I. M. Pop, K. Geerlings, G. Catelani, R. J. Schoelkopf, L. Glazman and M. H. Devoret
    Nature, 508, 369 (2014), doi:10.1038/nature13017, pdf download (ca. 3.6 MB)

  4. Measurement of the effect of quantum phase-slips in a Josephson junction chain
    I. M. Pop, I. Protopopov, F. Lecocq, Z. Peng, B. Pannetier, O. Buisson and W. Guichard
    Nature Physics, 6, 589-592 (2010), pdf download (ca. 420 kB)