Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 2: Quantum Communication I
Q 2.4: Vortrag
Montag, 6. März 2017, 15:30–15:45, P 3
A Compact Quantum Key Distribution Sender Module for Handheld Operation — Gwenaelle Mélen1, Tobias Vogl2, Peter Freiwang2, •Jannik Luhn2, Clemens Sonnleitner2, Wenjamin Rosenfeld2, and Harald Weinfurter1,2 — 1Max- Planck-Institut für Quantenoptik, Garching, Germany — 2Ludwig- Maximilians-Universität, Munich, Germany
Quantum Key Distribution (QKD) over free space channels offers a multitude of different application scenarios -- provided it can be combined with conventional communication systems. Employing micro-optics and waveguide circuits enables a new level of integration. Here we present a novel miniaturized sender module ready for handheld operation in combination with a tracking receiver.
Our system implements a BB84-like protocol. A visible beacon laser allows aiming and is modulated for synchronization purposes. A classical communication channel between sender and receiver is established by means of a smartphone via Wi-Fi. We will report on results demonstrating secure key rates on the order of a few 100 kBit/s in mounted and a few 10 kBit/s in handheld operation at quantum bit error ratios (QBERs) of less than 2%.
Our concept should enable QKD sender optics no larger than a single match. With this size and robustness it is well suited for a huge variety of communication schemes. It can be integrated in mobile phones or optical wireless systems, but also be combined with classical communication links, e.g., free-space optical systems in urban areas or even micro-satellites thereby enabling global key exchange.