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Journal of Physics Conference Series

Decoherence of high-n, high-lRydberg wave packets by electrical noise and collisions

S. Yoshida, Carlos O Reinhold, Joachim Burgdörfer, B. Wyker, S Ye, F. B. Dunning

Published Nov 5, 2012• 0 citations
Publisher

Abstract

Quantum revivals in high- n ( n ~300) high- l Rydberg wave packets are used to examine decoherence induced by application of "colored" electrical noise and by collisions.
DOI
10.1088/1742-6596/388/3/032003

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Quantum revivals in very-high-n (n ~ 300) high-l Rydberg wave packets generated from parent np states are used to examine decoherence induced by the application of 'coloured' noise from a random pulse generator and by collisions. In the absence of external perturbations, the high-l wave packets maintain their coherence for periods ~ 1 µs, i.e. for many hundreds of orbits. This coherence can be destroyed on sub-microsecond timescales by the application of even very small amounts of electrical noise at a rate that depends markedly on the spectral characteristics of the noise. In contrast, measurements over similar timescales with CO2 target gas densities of ~ 1011 cm−3 provided no evidence of collisional dephasing. The mechanisms responsible for decoherence are discussed with the aid of classical and quantum simulations. The results of these simulations are in good accord with the experimental data.
High angular momentum Rydberg wave packets are studied. Application of carefully tailored electric fields to low angular momentum, high- n ( n ∼ 300) Rydberg atoms creates coherent superpositions of Stark states with near extreme values of angular momentum, [cursive l]. Wave packet components orbit the parent nucleus at rates that depend on their energy, leading to periods of localization and delocalization as the components come into and go out of phase with each other. Monitoring survival probability signals in the presence of position dependent probing leads to observation of characteristic oscillations based on the composition of the wave packet. The discrete nature of electron energy levels is observed through the measurement of quantum revivals in the wave packet localization signal. Time-domain spectroscopy of these signals allows determination of both the population and phase of individual superposition components. Precise manipulation of wave packets is achieved through further application of pulsed electric fields. Decoherence effects due to background gas collisions and electrical noise are also detailed. Quantized classical trajectory Monte-Carlo simulations are introduced and agree remarkably well with experimental results.