Thermalization of trapped ions: A quantum perturbation approach

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Abstract

The rate at which external random thermal fluctuations drive transitions between, and cause decoherence of, the near ground vibrational (harmonic oscillator) quantum states of trapped cold ions is of crucial importance in relation to quantum computing. Presented here is an estimate of these rates, for a single trapped ion, based on a quantum perturbation approach where an external thermal energy reservoir is electrically coupled to the ion. The results are for a general system, and it is shown that the relevant parameter in the interpretation of experimentally observed heating rates is the correlation time of the fluctuations. The rates due to the fluctuating electric field associated with blackbody radiation are also considered and shown to be negligible.

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Lamoreaux, S. K. (1997). Thermalization of trapped ions: A quantum perturbation approach. Physical Review A - Atomic, Molecular, and Optical Physics, 56(6), 4970–4975. https://doi.org/10.1103/PhysRevA.56.4970

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