Thermal light in confined dimensions for "laser" cooling with unfiltered sunlight

• URL: http://arxiv.org/abs/2305.11124v1
• Date: Thu, 18 May 2023 17:14:51 GMT
• Title: Thermal light in confined dimensions for "laser" cooling with unfiltered sunlight
• Authors: Amanda Younes and Wesley C. Campbell
• Abstract summary: We show how to cool a trapped ion to its motional ground state using unfiltered sunlight at $5800,mathrmK$ to drive the cooling. We show how to treat the statistics of thermal light in a single-mode fiber for delivery to the ion, and show experimentally how the black-body spectrum is strongly modified by being embedded in quasi-one-dimensional.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Cooling of systems to sub-kelvin temperatures is usually done using either a cold bath of particles or spontaneous photon scattering from a laser field; in either case, cooling is driven by interaction with a well-ordered, cold (i.e. low entropy) system. However, there have recently been several schemes proposed for ``cooling by heating,'' in which raising the temperature of some mode drives the cooling of the desired system faster. We discuss how to cool a trapped ion to its motional ground state using unfiltered sunlight at $5800\,\mathrm{K}$ to drive the cooling. We show how to treat the statistics of thermal light in a single-mode fiber for delivery to the ion, and show experimentally how the black-body spectrum is strongly modified by being embedded in quasi-one-dimension. Quantitative estimates for the achievable cooling rate with our measured fiber-coupled, low-dimensional sunlight show promise for demonstrating this implementation of cooling by heating.

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