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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Projected Dipole Moments of Individual Two-Level Defects Extracted Using Circuit Quantum Electrodynamics.

B Sarabi1,2, A N Ramanayaka1,2, A L Burin3

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|May 7, 2016
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Summary
This summary is machine-generated.

Researchers characterized material-based two-level systems (TLSs) by tuning their energies with an electric field. This method individually determined dipole moments and measured electric-field fluctuations in superconducting circuits without needing the electric-field volume.

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Area of Science:

  • Quantum Computing
  • Solid State Physics
  • Materials Science

Background:

  • Material-based two-level systems (TLSs) are defects in sensitive low-temperature devices like superconducting qubits and photon detectors.
  • Characterizing these TLSs is crucial for improving device performance but remains challenging.

Purpose of the Study:

  • To develop a method for individually characterizing TLSs by measuring their dipole moments.
  • To determine the distribution of dipole moments in a material.
  • To measure electric-field fluctuations in superconducting circuits.

Main Methods:

  • Applying a uniform DC electric field to tune TLS energies within a superconducting resonator.
  • Observing individual TLS energy shifts as a function of the applied electric field.
  • Utilizing circuit quantum electrodynamics to couple TLSs to the resonator.

Main Results:

  • Individual projected dipole moments (p_{z}) for 60 TLSs were obtained.
  • The distribution of p_{z} was modeled with two distinct dipole moment magnitudes: p_{1}=2.8±0.2 D and p_{2}=8.3±0.4 D.
  • Vacuum-Rabi splitting was used to measure circuit zero-point electric-field fluctuations.

Conclusions:

  • The developed method allows for precise characterization of TLS dipole moments.
  • This technique provides a novel way to measure electric-field fluctuations in quantum circuits.
  • Understanding TLS properties is vital for advancing quantum technologies.