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Grant support

The authors thank Xie Chen and Hans Peter Buchler for helpful discussions. We also appreciate MIT Lincoln Laboratories for the provision of a traveling-wave parametric amplifier used for both spectroscopic and timedomain measurements in this work, and Jen-Hao Yeh and B. S. Palmer for the cryogenic attenuators for reducing thermal noise in the metamaterial waveguide. This work was supported by the AFOSR MURI Quantum Photonic Matter (Grant No. FA9550-16-1-0323), the DOE-BES Quantum Information Science Program (Grant No. DESC0020152), the AWS Center for Quantum Computing, the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center (Grant No. PHY-1733907) with support of the Gordon and Betty Moore Foundation, and the Kavli Nanoscience Institute at Caltech. V. S. F. gratefully acknowledges support from NSF GFRP Fellowship. A. S. is supported by Institute for Quantum Information and Matter Postdoctoral Fellowship. A. G.-T. acknowledges funding from project PGC2018-094792-B-I00 (MCIU/AEI/FEDER, UE), CSIC Research Platform PTI001, and CAM/FEDER Project No. S2018/TCS-4342 (QUITEMAD-CM).C

Analysis of institutional authors

Bello, MAuthorGonzalez-Tudela, AAuthor
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Article

Quantum Electrodynamics in a Topological Waveguide

Publicated to:Physical Review X. 11 (1): 11015- - 2021-01-25 11(1), DOI: 10.1103/PhysRevX.11.011015

Authors: Kim, Eunjong; Zhang, Xueyue; Ferreira, Vinicius S; Banker, Jash; Iverson, Joseph K; Sipahigil, Alp; Bello, Miguel; Gonzalez-Tudela, Alejandro; Mirhosseini, Mohammad; Painter, Oskar

Affiliations

AWS Ctr Quantum Comp, Pasadena, CA 91125 USA - Author
CALTECH, Gordon & Betty Moore Lab Engn, Pasadena, CA 91125 USA - Author
CALTECH, Inst Quantum Informat & Matter, Pasadena, CA 91125 USA - Author
CALTECH, Kavli Nanosci Inst, Pasadena, CA 91125 USA - Author
CALTECH, Thomas J Watson Sr Lab Appl Phys, Pasadena, CA 91125 USA - Author
CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain - Author
IFF CSIC, Inst Fis Fundamental, Calle Serrano 113b, Madrid 28006, Spain - Author
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Abstract

While designing the energy-momentum relation of photons is key to many linear, nonlinear, and quantum optical phenomena, a new set of light-matter properties may be realized by employing the topology of the photonic bath itself. In this work we experimentally investigate the properties of superconducting qubits coupled to a metamaterial waveguide based on a photonic analog of the Su-Schrieffer-Heeger model. We explore topologically induced properties of qubits coupled to such a waveguide, ranging from the formation of directional qubit-photon bound states to topology-dependent cooperative radiation effects. Addition of qubits to this waveguide system also enables direct quantum control over topological edge states that form in finite waveguide systems, useful for instance in constructing a topologically protected quantum communication channel. More broadly, our work demonstrates the opportunity that topological waveguide-QED systems offer in the synthesis and study of many-body states with exotic long-range quantum correlations.

Keywords
AtomsPhotonsPython frameworkQutipSimulationsSpin dynamics

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Physical Review X due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2021, it was in position 6/86, thus managing to position itself as a Q1 (Primer Cuartil), in the category Physics, Multidisciplinary. Notably, the journal is positioned above the 90th percentile.

From a relative perspective, and based on the normalized impact indicator calculated from World Citations provided by WoS (ESI, Clarivate), it yields a value for the citation normalization relative to the expected citation rate of: 16.67. This indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: ESI Nov 14, 2024)

This information is reinforced by other indicators of the same type, which, although dynamic over time and dependent on the set of average global citations at the time of their calculation, consistently position the work at some point among the top 50% most cited in its field:

  • Field Citation Ratio (FCR) from Dimensions: 46.48 (source consulted: Dimensions May 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-05-12, the following number of citations:

  • WoS: 138
  • Scopus: 150
Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-05-12:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 161.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 161 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 21.68.
  • The number of mentions on the social network Facebook: 1 (Altmetric).
  • The number of mentions on the social network X (formerly Twitter): 13 (Altmetric).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: United States of America.