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QI: Fachverband Quanteninformation
QI 29: Quantum Information: Concept and Methods II
QI 29.7: Vortrag
Donnerstag, 21. März 2024, 16:45–17:00, HFT-TA 441
Measuring beam deflections via weak measurements — •Carlotta Versmold1,2,3, Elina Köster1, Florian Huber1,2,3, Lev Vaidman4, Harald Weinfurter1,2,3, and Jan Dziewior1,2,3 — 1Department für Physik, Ludwig-Maximilians-Universität, Munich, Germany — 2Max-Planck-Institut für Quantenoptik, Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), Munich, Germany — 4Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv, Israel
The technique of weak value amplification makes it possible to measure small angular and spatial displacements of a laser beam precisely by using an interferometric measurement device. So far, weak value amplification setups could only measure displacements occurring due to an interaction inside the measurement device. Here, we present an interferometric weak measurement setup able to measure displacements of a light beam that occur outside of the device. For this, we implement a Sagnac-type interferometer with a dove prism in one of its arms. The dove prism mirrors the displacements, which occurred outside the interferometer, and introduces a relative deflection between the light beams in the two interferometer arms. Then, the center of mass of the resulting interference pattern will shift depending on the initial displacement times the weak amplification factor of the pre- and postselected interferometer states. In this experiment we demonstrate how tuning the interferometer to a large amplification factor allows a clear increase in the resolution for both external beam deflections and displacements.