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Q: Fachverband Quantenoptik und Photonik
Q 63: Poster – Quantum Information (joint session QI/Q)
Q 63.36: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Observing Product of Weak Values — •Vinay Tumuluru1,2,3, Jan Dziewior1,2,3, Carlotta Versmold1,2,3, Florian Huber1,2,3, Lev Vaidman4, and Harald Weinfurter1,2,3 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, 80797 München — 2MPI für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching — 3Munich Center for Quantum Science and Technology (MCQST), 80797 München — 4Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Israel
When a quantum system which was weakly coupled to a measuring 'pointer' system is suitably pre- and post-selected, one can observe a large shift in the state of the pointer. This shift is characterised by the 'weak value' of the pre- and post-selected system [1]. Weak values can be realised via optical interferometers where the path degree of freedom (system) is coupled with the transverse mode of the optical beam (pointer) [2]. Additionally, the polarisation degree of freedom can instead be employed as the system and coupled to the same pointer. This enables multiple systems to interact with the pointer individually and simultaneously. Interesting cases are explored, such as when weak values corresponding to each interaction are complex, but their product is real. Furthermore, a potential entanglement between the observed degrees of freedom can in turn lead to the violation of the product rule of weak values [3]. Ref: [1] Y. Aharonov et al, PRL. 60, 1351 (1988) [2] P. B. Dixon et al, PRL. 102 (2009) [3] X. Xu et al, PRL. 122, 100405 (2019)
Keywords: weak value; post-selection; product rule