Quantum harmonic oscillator spectrum analyzers

Abstract

Characterization and suppression of noise are essential for the control of harmonic oscillators in the quantum regime. We measure the noise spectrum of a quantum harmonic oscillator from low frequency to near the oscillator resonance by sensing its response to amplitude modulated periodic drives with a qubit. Using the motion of a trapped ion, we experimentally demonstrate two different implementations with combined sensitivity to noise from 500 Hz to 600 kHz. We apply our method to measure the intrinsic noise spectrum of an ion trap potential in a previously unaccessed frequency range.

arXiv comment6 + 10 pages, 4 + 7 figures

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• Optimized continuous dynamical decoupling via differential geometry and machine learning
• Quantum Vector Signal Analyzer: Wideband Electric Field Sensing via Motional Raman Transitions
• Contributions to the study of time dependent oscillators in Paul traps. Semiclassical approach
• Characterization and cancellation of power-line-induced motional-mode frequency noise in a trapped-ion system
• Detecting zero-point fluctuations with stochastic Brownian oscillators