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Proceedings Paper

Measuring the time tunneling particles spend in the barrier
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Paper Abstract

The question of how long a tunneling particle spends in the forbidden region of a barrier has been a perplexing puzzle in foundational quantum mechanics for many decades. The Larmor time, one definition of tunneling time, uses an auxiliary degree of freedom of the tunneling particles to clock the time spent inside the barrier. Recently, we made our first measurement of the Larmor time for Bose-condensed 87Rb atoms tunneling through an optical barrier.1 Here, we report on follow up measurements with improved precision in the measured times and also study the time for the reflected atomic cloud. We observe significant discrepancies between our results and a simple theory based on weak measurement. We discuss our findings, hypothesize explanations for our results, and suggest future studies.

Paper Details

Date Published: 25 February 2020
PDF: 8 pages
Proc. SPIE 11296, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II, 112960F (25 February 2020);
Show Author Affiliations
David C. Spierings, Univ. of Toronto (Canada)
Aephraim M. Steinberg, Univ. of Toronto (Canada)
Canadian Institute for Advanced Research, MaRS Ctr. (Canada)

Published in SPIE Proceedings Vol. 11296:
Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II
Selim M. Shahriar; Jacob Scheuer, Editor(s)

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