Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster: Quantum Optics and Photonics III

Q 57.26: Poster

Thursday, March 14, 2019, 16:15–18:15, S Fobau Physik

A trajectory in phase-space surpassing the Heisenberg- uncertainty limit — •Jascha Zander and Roman Schnabel — Institut für Laserphysik und Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg

The quantum uncertainty in a physical system is limited by the well-known Heisenberg-Uncertainty-Relation (HUR), which contains the amount of information that can be extracted from two non-commuting observables. Representatives are the position and momentum of a particle (ΔpΔx ≤ ℏ/2) or the electric field strengths in the extrema and the zero crossings of a monochromatic light wave, which is normalized to zero-point fluctuations (ΔXΔŶ ≤ 1).

Although mathematical precise formulated, the physical interpretation is not obvious. On the basis of the HUR, in 1935 Einstein, Podolsky and Rosen (EPR) wrongly conjectured that quantum theory does not provide a complete description of the actual reality. In this Experiment we demonstrate the EPR-Gedankenexperiment by simultaneous measurement on a single gaussian wave packet, in principle to arbitrarily small precision. Consequently, there should be a simultaneous measurement protocol for a very weak and time varying signal in the phase-space. Furthermore we show a trajectory within vacuum noise, with a resolution of ΔX(t)ΔŶ(t) ≈ 0.3 over an extended period of time. Based on this approach, the aim is to develop a clearer physical picture of the Heisenberg-Uncertainty-Relation.