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Quantum Oscillator Noise Spectroscopy via Displaced Cat States
Alistair R Milne1, Cornelius Hempel1, Li Li2
1ARC Centre of Excellence for Engineered Quantum Systems, The University of Sydney, School of Physics, New South Wales 2006, Australia.
Physical Review Letters
|July 9, 2021
Summary
We developed a new method to measure frequency noise in quantum harmonic oscillators using a coupled qubit. This technique precisely identifies intrinsic noise in trapped ion motion, crucial for quantum technologies.
Area of Science:
- Quantum physics
- Quantum optics
- Quantum information science
Background:
- Quantum harmonic oscillators are fundamental components in quantum technologies.
- Characterizing frequency noise is critical for improving the performance of these oscillators.
- Existing methods for noise spectrum determination can be limited in sensitivity or spectral range.
Purpose of the Study:
- To introduce a novel method for determining the frequency noise spectrum of quantum harmonic oscillator modes.
- To achieve high sensitivity in noise detection for trapped ion motion.
Main Methods:
- Coupling a quantum harmonic oscillator mode to a qubit with continuously driven qubit-state-dependent displacements.
- Reconstructing the noise spectrum using modulated drive patterns (phase and amplitude).
- Employing a data-fusion routine based on convex optimization for spectrum reconstruction.
Main Results:
- Successfully applied the technique to a single trapped ion.
- Achieved sensitivity to frequency fluctuations at the sub-Hertz level.
- Covered a spectral range from quasi-direct current (dc) up to 50 kilohertz (kHz).
Conclusions:
- The developed method provides a sensitive tool for characterizing frequency noise in quantum harmonic oscillators.
- This technique is valuable for identifying intrinsic noise sources in systems like trapped ions.
- The findings contribute to the advancement of quantum technologies by enabling better noise characterization and mitigation.
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