Quantum Magnetic J-Oscillators

• URL: http://arxiv.org/abs/2504.06498v2
• Date: Wed, 18 Jun 2025 17:10:21 GMT
• Title: Quantum Magnetic J-Oscillators
• Authors: Jingyan Xu, Raphael Kircher, Oleg Tretiak, Dmitry Budker, Danila A. Barskiy,
• Abstract summary: We introduce quantum J-oscillators that exploit intrinsic nuclear spin-spin (scalar J) couplings in molecules to produce phase-coherent oscillations.<n>In a proof-of-principle experiment, the J-oscillator produced a 337 uHz linewidth over 3000 s, more than two orders narrower than in conventional zero-field NMR.
• Score: 2.423370951696279
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We introduce quantum J-oscillators that exploit intrinsic nuclear spin-spin (scalar J) couplings in molecules to produce phase-coherent oscillations. Operated in zero magnetic field and driven by a digital feedback, they operate from sub-hertz to a few tens of hertz frequencies. In a proof-of-principle experiment on [15N]-acetonitrile, the oscillator produced a 337 uHz linewidth over 3000 s, more than two orders narrower than in conventional zero-field NMR. This may facilitate precision measurements of J-coupling constants and allows distinguishing mixtures of molecules whose zero-field NMR spectra would otherwise be hard to separate. In addition, the combination of strongly coupled spin systems and programmable feedback turns the J-oscillator into a compact tabletop (and, eventually, chip-scale) platform for exploring nonlinear spin dynamics, including chaos, dynamical phase transitions, and perhaps time-crystal behavior. By uniting high-resolution spectroscopy and controllable quantum dynamics in a single, magnet-free setup, J-oscillators open new opportunities for applications where ultraprecise frequency references or molecular fingerprints are required.

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