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Q: Fachverband Quantenoptik und Photonik

Q 20: Quantum Optics III

Q 20.2: Vortrag

Dienstag, 1. März 2016, 11:15–11:30, f442

Storage of fiber-guided light in a nanofiber-trapped ensemble of cold atoms — •Bernhard Albrecht, Christoph Clausen, Clément Sayrin, Philipp Schneeweiss, and Arno Rauschenbeutel — VCQ, Atominstitut, TU Wien, Stadionallee 2, 1020 Wien, Austria

The storage of a classical optical pulse is an important capability for the realization of all-optical signal processing schemes. Simple optical buffers can be extended to work as optical quantum memories, in which quantum states of light can be stored and retrieved. They are crucial elements of a global quantum optical network. The storage of light has been achieved with several systems. However, the realization of efficient, long-lived fiber-integrated optical memories is still subject to active research.

Here, we report on the progress of a novel implementation of an integrated optical quantum memory. We use an optical-nanofiber-based experimental platform for trapping and optically interfacing laser-cooled cesium atoms. Using the effect of electromagnetically induced transparency we are able to slow down fiber-guided light pulses to only 50 m/s [1]. We also experimentally show the storage and retrieval of fiber-guided light pulses on the single-photon level. We achieve a good overall efficiency and a largely improved characteristic memory lifetime compared to previously demonstrated fiber-integrated optical memories. Our results are an important step towards fully fiber-based quantum networks.

[1] C. Sayrin et al., Optica 2, 353-356 (2015).