Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 8: Quantum Information: Concepts and Methods II
Q 8.5: Vortrag
Montag, 6. März 2017, 18:00–18:15, P 2
On weak values, eigenvalues and expectation values — •Jan Dziewior1,2, Alon Ben-Israel3, Lukas Knips1,2, Mira Weißl1,2, Ran Ber3, Jasmin Meinecke1,2, Christian Schwemmer1,2, Lev Vaidman3, and Harald Weinfurter1,2 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany — 2Departement für Physik, Ludwig-Maximilians-Universität, 80797 München, Germany — 3Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel
Weak values, which have been introduced in 1988 by Aharonov, Albert and Vaidman, to this day constitute a controversial element in the debate about the foundations of quantum mechanics. While the usefulness of weak values has been demonstrated in various experimental applications, considerable disagreement prevails about their physical meaning.
Here we study the effects of the interaction between quantum systems and a pointer system in order to measure and evaluate their properties. Both in a theoretical analysis of the concept and in an experiment a fundamental difference between expectation values and weak values becomes apparent. Rather than having the statistical properties of expectation values, the similarity of the weak value to eigenvalues indicates that it is a definite property of pre- and post-selected quantum systems.