Quantum oscillator noise spectroscopy via displaced cat states

Abstract

Quantum harmonic oscillators are central to many modern quantum technologies. We introduce a method to determine the frequency noise spectrum of oscillator modes through coupling them to a qubit with continuously driven qubit-state-dependent displacements. We reconstruct the noise spectrum using a series of different drive phase and amplitude modulation patterns in conjunction with a data-fusion routine based on convex optimization. We apply the technique to the identification of intrinsic noise in the motional frequency of a single trapped ion with sensitivity to fluctuations at the sub-Hz level in a spectral range from quasi-DC up to 50 kHz.

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Cited by in corpus (12)

• Programmable quantum simulations of bosonic systems with trapped ions
• Batch Optimization of Frequency-Modulated Pulses for Robust Two-qubit Gates in Ion Chains
• Engineering dynamical couplings for quantum thermodynamic tasks
• Designing Filter Functions of Frequency-Modulated Pulses for High-Fidelity Two-Qubit Gates in Ion Chains
• Predicting molecular vibronic spectra using time-domain analog quantum simulation
• Quantum harmonic oscillator spectrum analyzers
• Quasienergy operators and generalized squeezed states for systems of trapped ions
• Benchmarking bosonic modes for quantum information with randomized displacements
• Scalable quantum logic spectroscopy
• Quantum Vector Signal Analyzer: Wideband Electric Field Sensing via Motional Raman Transitions
• Adapting coherent-state superpositions in noisy channels
• Characterization and cancellation of power-line-induced motional-mode frequency noise in a trapped-ion system