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Q: Fachverband Quantenoptik und Photonik
Q 68: Poster – Precision Measurement (joint session Q/A)
Q 68.15: Poster
Thursday, March 5, 2026, 17:00–19:00, Philo 2. OG
Quantum Systems With Multiple Weak Interactions — •Vinay Tumuluru1,2,3, Jan Dziewior1,2,3, Carlotta Versmold1,2,3, Florian Huber1,2,3, Lev Vaidman4, and Harald Weinfurter1,2,3 — 1Faculty of Physics, Ludwig-Maximilians-University, Munich, Germany — 2Max-Planck-Institute of Quantum Optics, Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), Munich, Germany — 4Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Israel
The `quantum weak value' of a pre- and post-selected quantum system [1] weakly interacting with a `pointer' describes the amplification of effects of the weak interaction [2]. These amplified effects can be observed experimentally in optical interferometers where pre- and post-selection can be finely controlled and performed on different DOFs.
With the path and polarisation DOFs of an optical Mach Zehnder interferometer serving as two systems and the transverse mode of the beam serving as pointer, one can observe weak amplification in individual weak coupling of each system to the pointer as well as the product of amplifications when both systems are coupled simultaneously [3]. Here we analyse and show in the experiment how entanglement between the DOFs changes the resulting amplification significantly.
[1] Y. Aharonov et al, PRL. 60, 1351 (1988) [2] P. B. Dixon et al, Phys. Rev. Lett. 102 (2009) [3] X. Xu et al, PRL. 122, 100405 (2019)
Keywords: Weak Values; Post-selection; Weak measurements