Tunable photonic cavity coupled to a voltage-biased double quantum dot system: Diagrammatic nonequilibrium Green's function approach

Bijay Kumar Agarwalla, Manas Kulkarni, Shaul Mukamel, and Dvira Segal
Phys. Rev. B 94, 035434 – Published 21 July 2016

Abstract

We investigate gain in microwave photonic cavities coupled to voltage-biased double quantum dot systems with an arbitrarily strong dot-lead coupling and with a Holstein-like light-matter interaction, by employing the diagrammatic Keldysh nonequilibrium Green's function approach. We compute out-of-equilibrium properties of the cavity: its transmission, phase response, mean photon number, power spectrum, and spectral function. We show that by the careful engineering of these hybrid light-matter systems, one can achieve a significant amplification of the optical signal with the voltage-biased electronic system serving as a gain medium. We also study the steady-state current across the device, identifying elastic and inelastic tunneling processes which involve the cavity mode. Our results show how recent advances in quantum electronics can be exploited to build hybrid light-matter systems that behave as microwave amplifiers and photon source devices. The diagrammatic Keldysh approach is primarily discussed for a cavity-coupled double quantum dot architecture, but it is generalizable to other hybrid light-matter systems.

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  • Received 11 April 2016
  • Revised 24 June 2016

DOI:https://doi.org/10.1103/PhysRevB.94.035434

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Bijay Kumar Agarwalla1, Manas Kulkarni2, Shaul Mukamel3, and Dvira Segal1

  • 1Chemical Physics Theory Group, Department of Chemistry, and Centre for Quantum Information and Quantum Control, University of Toronto, 80 Saint George Street, Toronto, Ontario, Canada M5S 3H6
  • 2Department of Physics, New York City College of Technology, City University of New York, Brooklyn, New York 11201, USA
  • 3Department of Chemistry and Department of Physics and Astronomy, University of California, Irvine, California 92697, USA

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Issue

Vol. 94, Iss. 3 — 15 July 2016

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