Collisional decoherence of a tracer particle moving in one dimension

Details Collisional decoherence of a tracer particle moving in one dimension Collisional decoherence of a tracer particle moving in one dimension

2010-07-23

arxiv.org/abs/1007.4080v2

Phys. Rev. A 82, 052104 (2010)

Physics

Quantum Physics

10 pages

Scientific paper

10.1103/PhysRevA.82.052104

We study decoherence of the external degree of freedom of a tracer particle moving in a one dimensional dilute Boltzmann gas. We find that phase averaging is the dominant decoherence effect, rather than information exchange between tracer and gas particles. While a coherent superposition of two wave packets with different mean positions quickly turns into a mixed state, it is demonstrated that such superpositions of different momenta are robust to phase averaging, until the two wave packets acquire a different position due to the different velocity of each wave packet.

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