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Bulletin of the American Physical Society

Extracting irreversible dephasing rates from the echoes of Rydberg Stark wavepackets.

J. J. Mestayer, B. Wyker, F. B. Dunning, Carlos O Reinhold, Shintaro Yoshida, Joachim Burgd orfer

Published May 28, 2008• 0 citations
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Journal of Physics Conference Series•Nov 1, 2007•1 citation
The precession of an electric dipole moment in an external electric field can be reversed by reversing the field direction. This time-reversal operation allows study of coherence in the time evolution of Rydberg Stark wave packets by measuring the resulting echoes. Different sources of reversible dephasing and irreversible dephasing, i.e., decoherence, are discussed in detail. Stochastic interactions with the environment are simulated in a controlled manner by using artificially synthesized noise. The rate of irreversible dephasing is determined from the reduction of the echo amplitude under multiple field reversals.
The generation of echoes in the electric dipole moment of a Rydberg wavepacket precessing in an external electric field by reversal of the field is described. When the wavepacket experiences reversible dephasing, large echoes are observed pointing to strong refocusing of the wavepacket. The presence of irreversible dephasing leads to a reduction in the size of the echoes. The effect of irreversible dynamics on echoes is investigated using artificially synthesized noise. Methods to determine the decoherence rate are discussed.