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Originally published in Science Express on 5 July 2001
Science 13 July 2001:
Vol. 293. no. 5528, pp. 221 - 223
DOI: 10.1126/science.1062985
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Perspectives

QUANTUM PHYSICS:
No Mere Anarchy

Salman Habib

Quantum tunneling through a potential barrier is a well-understood phenonmenon that, for example, explains hydrogen tunneling in chemical reactions. Add a time dependence, however, and things become more murky, as Habib explains in his Perspective. He highlights the report by Steck et al., who have gone one step further and have studied quantum dynamics in a classically chaotic system. Their observations provide experimental proof of chaos-assisted tunneling.

The author is in the Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. E-mail: habib{at}lanl.gov

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Science. ISSN 0036-8075 (print), 1095-9203 (online)