Miniature Quantum Key Distribution sender add-on for handheld devices

17 09/2015

Thursday, 17 Sep. 2015, 11:00 - 12:00

Workgroup Walther Group

Presenter: Tobias Vogl
Host: P. Walther
Where: Schrödinger room, 4th floor, Boltzmanng. 5, 1090 Wien

I present a complete free-space Quantum Key Distribution (QKD) solution for asymmetric client- server configurations. I am focusing on a practical scenario where the user owns an integrated QKD platform which allows him to generate on-demand a secure key with shared dedicated receivers. I believe that such implementation could open new possibilities for commercial applications towards secure daily-life authentication and transaction purposes.

The system implements the well-known BB84 protocol. It includes a miniature QKD sender device (35 x 20 x 8 mm) fully controlled by a smartphone via an Android App and classically communicating with the receiver’s computer over Wi-Fi. An additional bright visible laser is overlapped with the

100 MHz infrared output signal to enable both synchronization with the receiver and efficient beam tracking and controlling for continuous operation. With a quantum link efficiency as high as 34 % stable over a few seconds and a QBER of 5 %, a secret key rate over 26 kbit/s is expected.