Simulating many-body physics using Josephson-junction arrays in circuit-QED architecture

ORAL

Abstract

Josephson-junction arrays (JJAs) in superconducting circuits are prototypical systems which can be designed for various lattice topologies and have the ability to control the chemical potential and associated energy scales for studying the many-body phenomena in both classical and quantum regimes. Here we present microwave studies of JJAs in circuit-QED architecture which have the following advantage over the usual DC transport measurement scheme: the system is only weakly perturbed by microwave excitation, enabling this particular scheme to study properties of the ground state and the excited states at the single-excitation (photon) level. In this talk, we report the observation of lattice ordering of vortices and direct detection of plasma-mode (spin wave) spectra in a 31x3 quasi-1D JJA. We also present some recent results on many-body effects in a 100x100 square-lattice JJA.

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Presenters

  • Cosmic Raj

    The University of Tokyo

Authors

  • Cosmic Raj

    The University of Tokyo

  • Hiroki Ikegami

    RIKEN

  • Zhirong Lin

    RIKEN

  • Kunihiro Inomata

    National Institute of Advanced Industrial Science and Technology (AIST), AIST

  • Jacob Taylor

    Joint Quantum Institute and Joint Center for Quantum information Processing and Computer Science, NIST and University of Maryland, Joint Quantum Institute/NIST, National Institute of Standards and Technology, JQI/NIST, JQI, NIST & Univ. Maryland, Joint Center for Quantum Information and Computer Science, University of Maryland, Joint Quantum Institute

  • Yasunobu Nakamura

    Research Center for Advanced Science and Technology, the University of Tokyo, The University of Tokyo, Univ. of Tokyo, Research Center for Advanced Science and Technology (RCAST), University of Tokyo