TBNQuantum
Interaction-Assisted Spin Coherence in a Multimode Trapped Atomic Ensemble
Publication: quant-ph updates on arXiv.org
Author: Aleksandre Merabishvili, Ebubechukwu O. Ilo-Okeke
Source published: 08/10/2026, 04:00:00 UTC
Briefing created: 08/10/2026, 06:00:16 UTC
Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 08/10/2026, 04:13:25 UTC.
Briefings
A thermally occupied multimode trapped atomic ensemble exhibits mode-dependent detunings that suppress Ramsey contrast despite coherent underlying dynamics. A weak-axis-resolved Hamiltonian theory reveals collective mode spins experience longitudinal detunings and overlap-dependent exchange interactions. Without exchange, thermally induced detuning spread causes coherent phase mixing and algebraically decaying Ramsey contrast in the many-mode continuum regime. At the mean-field level, exchange generates a self-consistent restoring field reducing phase dispersion and restoring collective contrast. The crossover is governed by the competition between collective exchange scale and thermally induced detuning spread, showing inverse-square thermal scaling with an exponent of 2.06. Weak irreversible pure dephasing limits but does not eliminate this recovery, demonstrating exchange refocuses coherent inhomogeneous phase mixing but cannot reverse irreversible phase noise.
Key points
- In a thermally occupied multimode trapped ensemble, mode-dependent detunings can strongly suppress Ramsey contrast even when the underlying dynamics remains coherent.
- The crossover between collective exchange scale and thermally induced detuning spread follows an inverse-square thermal scaling with a numerical exponent of 2.06.
Context and limitations
Results are presented at the mean-field level and do not account for weak irreversible pure dephasing effects that limit but do not eliminate the recovery of contrast.
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