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Title: Cavity quantum electrodynamics using a near-resonance two-level system: Emergence of the Glauber state

Random tunneling two-level systems (TLSs) in dielectrics have been of interest recently because they adversely affect the performance of superconducting qubits. The coupling of TLSs to qubits has allowed individual TLS characterization, which has previously been limited to TLSs within (thin) Josephson tunneling barriers made from aluminum oxide. Here, we report on the measurement of an individual TLS within the capacitor of a lumped-element LC microwave resonator, which forms a cavity quantum electrodynamics (CQED) system and allows for individual TLS characterization in a different structure and material than demonstrated with qubits. Due to the reduced volume of the dielectric (80 μm{sup 3}), even with a moderate dielectric thickness (250 nm), we achieve the strong coupling regime as evidenced by the vacuum Rabi splitting observed in the cavity spectrum. A TLS with a coherence time of 3.2 μs was observed in a film of silicon nitride as analyzed with a Jaynes-Cummings spectral model, which is larger than seen from superconducting qubits. As the drive power is increased, we observe an unusual but explicable set of continuous and discrete crossovers from the vacuum Rabi split transitions to the Glauber (coherent) state.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [1] ;  [2]
  1. Laboratory for Physical Sciences, College Park, Maryland 20740 (United States)
  2. (United States)
  3. Department of Chemistry, Tulane University, New Orleans, Louisiana 70118 (United States)
  4. Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)
Publication Date:
OSTI Identifier:
22398968
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM OXIDES; ANNIHILATION OPERATORS; CAPACITORS; COUPLING; DIELECTRIC MATERIALS; EIGENSTATES; FILMS; MICROWAVE RADIATION; QUANTUM ELECTRODYNAMICS; QUBITS; RANDOMNESS; RESONANCE; RESONATORS; SILICON NITRIDES; TUNNEL EFFECT