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Negative Wigner function at telecommunication wavelength from homodyne detection
Christoph Baune, Jaromir Fiurasek, Roman Schnabel
Quantum states of light having a Wigner function with negative values represent a key resource in quantum communication and quantum information processing. Here, we present the gen…
Unconditional entanglement interface for quantum networks
Christoph Baune, Jan Gniesmer, Sacha Kocsis +4
Entanglement drives nearly all proposed quantum information technologies. By up-converting part of a 1550 nm two-mode squeezed vacuum state to 532 nm, we demonstrate the generation…
Strongly squeezed states at 532 nm based on frequency up-conversion
Christoph Baune, Jan Gniesmer, Axel Schönbeck +3
Quantum metrology utilizes nonclassical states to improve the precision of measurement devices. In this context, strongly squeezed vacuum states of light have proven to be a useful…
Quantum non-Gaussianity of frequency up-converted single photons
Christoph Baune, Axel Schönbeck, Aiko Samblowski +2
Nonclassical states of light are an important resource in today's quantum communication and metrology protocols. Quantum up-conversion of nonclassical states is a promising approac…
Weak-signal conversion from 1550nm to 532nm with 84% efficiency
Aiko Samblowski, Christina E. Vollmer, Christoph Baune +2
We report on the experimental frequency conversion of a dim, coherent continuous-wave light field from 1550nm to 532nm with an external photon-number conversion efficiency of (84.4…