Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster: Quantum Optics and Photonics III

Q 42.21: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

Increasing the information content of single photons — •Tristan Tentrup, Thommas Hummel, Allard Mosk, and Pepijn Pinkse — MESA+ Institute for Nanotechnology, Universiteit Twente

A common way to encode information in single photons is the use of polarization, which allows a maximum of 1 bit per photon. Encoding in a higher dimensional Hilbert space allows to transfer more information per photon. Examples of encoding methods are time binning and the use of orbital angular momentum states. We use a spatial light modulator (SLM) to control the spatial position of single photons generated by a spontaneous parametric down-conversion source. Exploiting modern two-dimensional photon counting imaging systems, we detect their (x,y) positions and discuss the limit on information density. A possible application of this work is Quantum Key Distribution (QKD), where an increase in information per photon not only increases the possible key generation rate but also the security of the protocol.