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Subradiant states of quantum bits coupled to a one-dimensional waveguide

Albrecht, Andreas and Henriet, Loïc and Asenjo-Garcia, Ana and Dieterle, Paul B. and Painter, Oskar and Chang, Darrick E. (2019) Subradiant states of quantum bits coupled to a one-dimensional waveguide. New Journal of Physics, 21 (2). Art. No. 025003. ISSN 1367-2630. doi:10.1088/1367-2630/ab0134.

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The properties of coupled emitters can differ dramatically from those of their individual constituents. Canonical examples include sub- and super-radiance, wherein the decay rate of a collective excitation is reduced or enhanced due to correlated interactions with the environment. Here, we systematically study the properties of collective excitations for regularly spaced arrays of quantum emitters coupled to a one-dimensional waveguide. We find that, for low excitation numbers, the modal properties are well-characterized by spin waves with a definite wavevector. Moreover, the decay rate of the most subradiant modes obeys a universal scaling with a cubic suppression in the number of emitters. Multi-excitation subradiant eigenstates can be built from fermionic combinations of single excitation eigenstates; such 'fermionization' results in multiple excitations that spatially repel one another. We put forward a method to efficiently create and measure such subradiant states, which can be realized with superconducting qubits. These measurement protocols probe both real-space correlations (using on-site dispersive readout) and temporal correlations in the emitted field (using photon correlation techniques).

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Asenjo-Garcia, Ana0000-0001-9850-5610
Painter, Oskar0000-0002-1581-9209
Chang, Darrick E.0000-0002-5426-7339
Additional Information:© 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 30 July 2018; Accepted 23 January 2019; Accepted Manuscript online 23 January 2019; Published 28 February 2019. We are grateful to H J Kimble for stimulating discussions. AA-G was supported by an IQIM postdoctoral fellowship and the Global Marie Curie Fellowship LANTERN. PBD was supported by a graduate fellowship from the Fannie and John Hertz Foundation. DEC acknowledges support from Fundacio Privada Cellex, Spanish MINECO Severo Ochoa Program SEV-2015-0522, MINECO Plan Nacional Grant CANS, CERCA Programme/Generalitat de Catalunya, AGAUR Grant 2017 SGR 1334, and ERC Starting Grant FOQAL.
Group:Kavli Nanoscience Institute, Institute for Quantum Information and Matter
Funding AgencyGrant Number
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Marie Curie FellowshipLANTERN
Fannie and John Hertz FoundationUNSPECIFIED
Fundacio Privada CellexUNSPECIFIED
Ministerio de Economía, Industria y Competitividad (MINECO)UNSPECIFIED
Severo OchoaSEV-2015-0522
Generalitat de CatalunyaUNSPECIFIED
Agència de. Gestió d'Ajuts Universitaris i de Recerca2017 SGR 1334
European Research Council (ERC)FOQAL
Subject Keywords:waveguide QED, subradiance, superradiance, superconducting qubits
Issue or Number:2
Record Number:CaltechAUTHORS:20180313-154705927
Persistent URL:
Official Citation:Andreas Albrecht et al 2019 New J. Phys. 21 025003
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85292
Deposited By: Joy Painter
Deposited On:13 Mar 2018 23:05
Last Modified:12 Jul 2022 19:45

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