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Q: Fachverband Quantenoptik und Photonik
Q 54: Quantum Sensing II (joint session Q/QI)
Q 54.3: Vortrag
Donnerstag, 13. März 2025, 11:45–12:00, HS I PI
Measuring Beam Displacements via Weak Value Amplification — •Carlotta Versmold1,2,3, Jan Dziewior1,2,3, Florian Huber1,2,3, Lev Vaidman4, and Harald Weinfurter1,2,3 — 1Ludwig-Maximilians-Universität, Germany — 2Max-Planck-Institut für Quantenoptik, Germany — 3Munich Center for Quantum Science and Technology, Germany — 4Tel-Aviv University, Israel
Weak value amplification enables precise measurement of a laser beam's small angular and spatial displacements using interferometric setups. While traditionally limited to detecting displacements inside the interferometer, we present a system that detects external beam displacements through amplification in the dark port of the interferometer. Simultaneously, the beam can be spatially filtered since displacements are suppressed in the bright port. Using a Sagnac-type interferometer with a dove prism in one arm, external displacements are mirrored in this arm, which induces a relative deflection between the two interferometer arms, shifting the center of mass of the interference pattern. This shift is given by the initial displacements amplified by the weak value of the pre- and postselected interferometer states. With an amplification by a factor of up to 20, this experiment clearly demonstrates and also extends the applicability of the weak value measurement methods.
Keywords: weak value; pre- and postselection