Related papers: Modular variable laser cooling for efficient entropy extraction

Modular variable laser cooling for efficient entropy extraction

URL: http://arxiv.org/abs/2408.16128v1
Date: Wed, 28 Aug 2024 20:28:21 GMT
Title: Modular variable laser cooling for efficient entropy extraction
Authors: Brennan de Neeve, Thanh-Long Nguyen, Alexander Ferk, Tanja Behrle, Francesco Lancellotti, Matteo Simoni, Stephan Welte, Jonathan Home,
Abstract summary: We show a method for laser cooling an oscillator based on sequences of spin-state-dependent displacements followed by spin repumps. We demonstrate the method experimentally using the internal and motional states of a single trapped ion.
Score: 34.82692226532414
License: http://creativecommons.org/licenses/by/4.0/
Abstract: We propose and experimentally demonstrate a method for laser cooling an oscillator based on sequences of spin-state-dependent displacements followed by spin repumping. For a thermal state with mean occupation $\bar{n}\gg 1$ the method attains a reduction to 0.632 of the initial thermal oscillator occupation for two repumps of the two-level spin state. This is within a factor of 2.53 of the optimum that might be expected due to the reduction of the oscillator entropy by $2 \ln(2)$. We show that the method, which is based on encoding the value of the modular-variable of the oscillator into the spin, has a simple semi-classical description in terms of a Bayesian update. We demonstrate the method experimentally using the internal and motional states of a single trapped ion.

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