Hannover 2003 – wissenschaftliches Programm
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Q: Quantenoptik
Q 33: Quanteneffekte 2
Q 33.3: Vortrag
Donnerstag, 27. März 2003, 11:30–11:45, F107
Quantum resonances and decoherence in atom optics — •Sandro Wimberger1,2, Italo Guarneri2, Shmuel Fishman3, and Andreas Buchleitner1 — 1Max-Planck-Institut f. Physik komplexer Systeme, 01187 Dresden — 2Università degli Studi dell’ Insubria, I-22100 Como — 3Physics Department, Technion, Haifa IL-32000
Recent quantum optical experiments [1] implement kicked atoms with a variety of new coherence and decoherence effects, extending the simple model of the famous delta-kicked rotor. Noise does not only destroy coherence and dynamical localization, it also – somewhat counter-intuitively – was claimed to enhance resonance peaks. We clarify the theoretical understanding of the experimental results focusing on the influence of noise due to spontaneous emission [2]. The atomic dynamics close to resonance is analyzed by means of a quasi-classical approximation where the small parameter is the detunning from exact resonance, which plays the rôle of Planck’s constant. Based on a new experimental proposal we calculate the decay of the interference signal (fidelity) of two distinct evolutions in various dynamical regimes, and present a detailed study of the noise-induced temporal decay of the signal.
[1] M.B. d’Arcy et al., Phys. Rev. Lett. 87, 74102 (2001)
[2] S. Wimberger et al., submitted to Nonlinearity