Coherent Control of Ultracold Collisions with Chirped Light: Direction Matters

Details Coherent Control of Ultracold Collisions with Chirped Light: Direction Matters Coherent Control of Ultracold Collisions with Chirped Light: Direction Matters

2006-12-07

arxiv.org/abs/physics/0612071v1

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevA.75.051401

We demonstrate the ability to coherently control ultracold atomic Rb collisions using frequency-chirped light on the nanosecond time scale. For certain center frequencies of the chirp, the rate of inelastic trap-loss collisions induced by negatively chirped light is dramatically suppressed compared to the case of a positive chirp. We attribute this to a fundamental asymmetry in the system: an excited wavepacket always moves inward on the attractive molecular potential. For a positive chirp, the resonance condition moves outward in time, while for a negative chirp, it moves inward, in the same direction as the excited wavepacket; this allows multiple interactions between the wavepacket and the light, enabling the wavepacket to be returned coherently to the ground state. Classical and quantum calculations support this interpretation.

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