Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 8: Quantum Information: Concepts and Methods II
Q 8.7: Vortrag
Montag, 29. Februar 2016, 16:00–16:15, e214
Beyond Conventional Photon Counting — •Johannes Kröger1, Thomas Ahrens1, Jan Sperling2, Boris Hage3, Werner Vogel2, and Heinrich Stolz1 — 1Semiconductor Optics Group, University of Rostock, Rostock, Germany — 2Theoretical Quantum Optics Group, University of Rostock, Rostock, Germany — 3Experimental Quantum Optics Group, University of Rostock, Rostock, Germany
Quantum information sciences are heavily depending on photon number resolving measurements. Advancing demands on detector performances go beyond the abilities of state-of-the-art devices. The established high sensitivity detectors operate in a binary detection mode, creating only a click for any number of absorbed photons.
Systems of click detectors, such as APD-arrays, superconducting nanowires or time multiplexed setups, proved convenient and reliable in many recent experiments. We demonstrate, with experimental evidence, that neither is the statistical information acquired with these devices insufficient for discriminating quantum states, nor is the nonlinear detection mode a disadvantage towards true photon counters.
We developed a model for detector characteristics, enabling us to extract vital information about the light field with intensities ranging from few photons to photon numbers higher than the number of detector elements (or time bins). Exposing our 10×10 APD-array to fs-Ti:Sapphire laser pulses, we measured a parameter for indication of quantum light (similar to the Mandel Q parameter) and higher quantum correlations.