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Superconducting Quantum Metamaterials

Brehm, Jan David

Abstract (englisch):
Superconducting quantum metamaterials extend the idea of their classical counterpart to a regime where their constituent meta-atoms are quantum objects, which can hold their quantum coherence for longer than the propagation time of light through the medium.
In this work, we have realized a quantum metamaterial consisting of eight individually controllable superconducting transmon qubits, which are coupled to the mode continuum of a one-dimensional coplanar waveguide. This system can be described within the framework of waveguide-quantum electrodynamics, which predicates that the mutual interaction of the qubits with the waveguide gives rise to long-range interactions of the qubits.
In spectroscopic measurements we observe the formation of super- and subradiant collective metamaterial excitations, as well as the emergence of a polaritonic band gap and study their dependence on the number of participating resonant qubits. We utilize the collective Autler-Townes splitting of the metamaterial to demonstrate control over its band gap. Furthermore, we exploit the control over the band structure for a first realization of slowly propagating light in the metamaterial. ... mehr

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Volltext §
DOI: 10.5445/IR/1000130266
Veröffentlicht am 11.03.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Hochschulschrift
Publikationsdatum 11.03.2021
Sprache Englisch
Identifikator KITopen-ID: 1000130266
Verlag Karlsruher Institut für Technologie (KIT)
Umfang iii, 132 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Physik (PHYSIK)
Institut Physikalisches Institut (PHI)
Prüfungsdatum 15.01.2021
Referent/Betreuer Prof. A. V. Ustinov
Schlagwörter Supraleitung, Quantenbits, Festkörperphysik, Metamaterialien, Quantencomputing, superconductivity, quantum bits, solid state physics, metamaterials, quantum computing
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