Superconducting metamaterials for waveguide quantum electrodynamics

Mohammad Mirhosseini, Eunjong Kim, Vinicius S. Ferreira, Mahmoud Kalaee, Alp Sipahigil, Andrew J. Keller and Oskar Painter ()
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Mohammad Mirhosseini: California Institute of Technology
Eunjong Kim: California Institute of Technology
Vinicius S. Ferreira: California Institute of Technology
Mahmoud Kalaee: California Institute of Technology
Alp Sipahigil: California Institute of Technology
Andrew J. Keller: California Institute of Technology
Oskar Painter: California Institute of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Embedding tunable quantum emitters in a photonic bandgap structure enables control of dissipative and dispersive interactions between emitters and their photonic bath. Operation in the transmission band, outside the gap, allows for studying waveguide quantum electrodynamics in the slow-light regime. Alternatively, tuning the emitter into the bandgap results in finite-range emitter–emitter interactions via bound photonic states. Here, we couple a transmon qubit to a superconducting metamaterial with a deep sub-wavelength lattice constant (λ/60). The metamaterial is formed by periodically loading a transmission line with compact, low-loss, low-disorder lumped-element microwave resonators. Tuning the qubit frequency in the vicinity of a band-edge with a group index of ng = 450, we observe an anomalous Lamb shift of −28 MHz accompanied by a 24-fold enhancement in the qubit lifetime. In addition, we demonstrate selective enhancement and inhibition of spontaneous emission of different transmon transitions, which provide simultaneous access to short-lived radiatively damped and long-lived metastable qubit states.

Date: 2018
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DOI: 10.1038/s41467-018-06142-z

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