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Q: Fachverband Quantenoptik und Photonik

Q 60: Quantum Information II

Q 60.7: Poster

Donnerstag, 17. März 2022, 16:30–18:30, P

Double nondestructive detection of an optical photon — •Lukas Hartung, Emanuele Distante, Severin Daiss, Stefan Langenfeld, Philip Thomas, Olivier Morin, Stephan Welte, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching

In this talk, we will present an experiment demonstrating the double nondestructive detection of an optical photon [3]. The photon propagates in a 60 m long glass fiber, to which two nondestructive detectors are attached. Each detector consists of a single rubidium atom strongly coupled to an optical resonator. To detect a photon, each of the atoms is prepared in superposition state. When reflecting a photon off the cavity, a π-phase shift is imprinted on the superposition state. The photon is successively reflected from the two resonators and the subsequent readout of the phase of the superposition state of each atom heralds the presence of the photon. Correlations between the detector clicks are observed, and it is demonstrated that the detection efficiency of the two concatenated detectors surpasses the detection efficiencies of each individual detector. Furthermore, the experiment shows that the signal-to-noise ratio of the double detection is enhanced by about two orders of magnitude compared to the signal-to-noise ratios of the individual detectors.

[1] E. Distante et al., Phys. Rev. Lett. 126, 253603 (2021)