Projected Dipole Moments of Individual Two-Level Defects Extracted Using Circuit Quantum Electrodynamics

B. Sarabi, A. N. Ramanayaka, A. L. Burin, F. C. Wellstood, and K. D. Osborn
Phys. Rev. Lett. 116, 167002 – Published 22 April 2016
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Abstract

Material-based two-level systems (TLSs), appearing as defects in low-temperature devices including superconducting qubits and photon detectors, are difficult to characterize. In this study we apply a uniform dc electric field across a film to tune the energies of TLSs within. The film is embedded in a superconducting resonator such that it forms a circuit quantum electrodynamical system. The energy of individual TLSs is observed as a function of the known tuning field. By studying TLSs for which we can determine the tunneling energy, the actual pz, dipole moments projected along the uniform field direction, are individually obtained. A distribution is created with 60 pz. We describe the distribution using a model with two dipole moment magnitudes, and a fit yields the corresponding values p=p1=2.8±0.2D and p=p2=8.3±0.4D. For a strong-coupled TLS the vacuum-Rabi splitting can be obtained with pz and tunneling energy. This allows a measurement of the circuit’s zero-point electric-field fluctuations, in a method that does not need the electric-field volume.

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  • Received 25 March 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.167002

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

B. Sarabi1,2, A. N. Ramanayaka1,2, A. L. Burin3, F. C. Wellstood2,4, and K. D. Osborn1,4,*

  • 1Laboratory for Physical Sciences, College Park, Maryland 20740, USA
  • 2Department of Physics, University of Maryland, College Park, Maryland 20742, USA
  • 3Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA
  • 4Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA

  • *osborn@lps.umd.edu

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Issue

Vol. 116, Iss. 16 — 22 April 2016

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