Christoph Schaeff

TL;DR: A method for converting the polarization state of photons into information encoded into spatial modes of a single photon is presented and entanglement of very high OAM can improve the sensitivity of angular resolution in remote sensing.

TL;DR: An experiment with single photonic qutrits provides evidence that no joint probability distribution describing the outcomes of all possible measurements—and, therefore, no non-contextual theory—can exist.

TL;DR: The flexibility and generality of the system is demonstrated by realizing a complete characterization of the two qutrit space of higher-order Einstein-Podolsky-Rosen correlations and the scheme allows for complete on-chip integration.

TL;DR: In this paper, a fiber integrated source for path-entangled photons in the telecom band at 1.55µm using only standard fiber technology is presented, and a very high quality of entanglement is verified by various measurements, i.e., a tomographic state reconstruction is performed leading to a background corrected fidelity of (99.45±0.06)%.

TL;DR: In this article, the authors presented a simple and accurate methodology of characterizing dark count rate, detection efficiency, and after-pulsing in single photon detectors purely based on their counting statistics.