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Quantum Harmonic Oscillator Spectrum Analyzers.

Jonas Keller1,2, Pan-Yu Hou1,2, Katherine C McCormick1,2

  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.

Physical Review Letters
|July 9, 2021
PubMed
Summary
This summary is machine-generated.

We developed a new method to measure noise in quantum harmonic oscillators using trapped ions. This technique allows for precise characterization of noise spectra in previously unaccessed frequency ranges.

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Area of Science:

  • Quantum physics
  • Quantum optics
  • Quantum control

Background:

  • Controlling quantum harmonic oscillators requires understanding and mitigating noise.
  • Quantum regime operations are highly sensitive to environmental disturbances.

Purpose of the Study:

  • To develop and demonstrate a novel method for characterizing the noise spectrum of a quantum harmonic oscillator.
  • To measure the intrinsic noise spectrum of an ion trap potential in a previously unaccessed frequency range.

Main Methods:

  • Utilized a trapped ion as a quantum harmonic oscillator.
  • Employed a qubit to sense the oscillator's response to amplitude-modulated periodic drives.
  • Implemented two distinct experimental configurations for noise measurement.

Main Results:

  • Successfully measured the noise spectrum of a quantum harmonic oscillator from low frequencies up to near its resonance.
  • Achieved combined sensitivity to noise across a broad frequency range (500 Hz to 600 kHz).
  • Provided measurements of the ion trap potential's intrinsic noise spectrum.

Conclusions:

  • The developed method offers a sensitive tool for noise characterization in quantum harmonic oscillators.
  • This technique opens new avenues for improving quantum control and understanding noise sources in quantum systems.
  • Experimental demonstration validates the method's effectiveness in exploring uncharted noise frequency ranges.