Measurement-based ground state cooling of a trapped ion oscillator

Abstract

Measurement-based cooling is a method by which a quantum system, initially in a thermal state, can be prepared in its ground state through some sort of measurement. This is done by making a measurement that heralds the system being in the desired state. Here we demonstrate the application of a measurement-based cooling technique to a trapped atomic ion. The ion is pre-cooled by Doppler laser cooling to a thermal state with a mean excitation of $\bar{n}\approx 18$ and the measurement-based cooling technique selects those occasions when the ion happens to be in the motional ground state. The fidelity of the heralding process is greater than 95%. This technique can be applied to other systems that are not as amenable to laser cooling as trapped ions.

arXiv comment6 pages, 5 figures

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Cited by in corpus (3)

• Erasure-cooling, control, and hyper-entanglement of motion in optical tweezers
• Transient dynamics of the quantum Stuart-Landau oscillator
• An almost deterministic cooling by measurements