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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…
Fundamental quantum interferometry bound for the squeezed-light-enhanced gravitational-wave detector GEO600
Rafal Demkowicz-Dobrzanski, Konrad Banaszek, Roman Schnabel
The fundamental quantum interferometry bound limits the sensitivity of an interferometer for a given total rate of photons and for a given decoherence rate inside the measurement d…
Stable control of 10 dB two-mode squeezed vacuum states of light
Tobias Eberle, Vitus Händchen, Roman Schnabel
Continuous variable entanglement is a fundamental resource for many quantum information tasks. Important protocols like superactivation of zero-capacity channels and finite-size qu…
Experimental entanglement distribution by separable states
Christina E. Vollmer, Daniela Schulze, Tobias Eberle +3
The distribution of entanglement between macroscopically separated parties represents a crucial protocol for future quantum information networks. Surprisingly, it has been theoreti…
High-bandwidth squeezed light at 1550 nm from a compact monolithic PPKTP cavity
Stefan Ast, Moritz Mehmet, Roman Schnabel
We report the generation of squeezed vacuum states of light at 1550 nm with a broadband quantum noise reduction of up to 4.8 dB ranging from 5 MHz to 1.2 GHz sideband frequency. We…