Quantum Key Distribution with a Hand-held Sender Unit

• URL: http://arxiv.org/abs/2207.12424v1
• Date: Mon, 25 Jul 2022 18:00:02 GMT
• Title: Quantum Key Distribution with a Hand-held Sender Unit
• Authors: Gwenaelle Vest, Peter Freiwang, Jannik Luhn, Tobias Vogl, Markus Rau, Lukas Knips, Wenjamin Rosenfeld, Harald Weinfurter
• Abstract summary: Quantum key distribution (QKD) is a crucial component for truly secure communication. Recent technological advances in integrated photonics now enable developments towards QKD for existing hand-held communication platforms. We report on the design and evaluation of a hand-held free-space QKD system including a micro-optics based sender unit.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum key distribution (QKD) is a crucial component for truly secure communication, which enables to analyze leakage of information due to eavesdropper attacks. While impressive progress was made in the field of long-distance implementations, user-oriented applications involving short-distance links have mostly remained overlooked. Recent technological advances in integrated photonics now enable developments towards QKD also for existing hand-held communication platforms. In this work we report on the design and evaluation of a hand-held free-space QKD system including a micro-optics based sender unit. This system implements the BB84-protocol employing polarization-encoded faint laser pulses at a rate of 100 MHz. Unidirectional beam tracking and live reference-frame alignment systems at the receiver side enable a stable operation over tens of seconds when aiming the portable transmitter to the receiver input by hand from a distance of about half a meter. The user-friendliness of our system was confirmed by successful key exchanges performed by different untrained users with an average link efficiency of about 20 % relative to the case of the transmitter being stationarily mounted and aligned. In these tests we achieve an average quantum bit error ratio (QBER) of 2.4 % and asymptotic secret key rates ranging from 4.0 kbps to 15.3 kbps. Given its compactness, the versatile sender optics is also well suited for integration into other free-space communication systems enabling QKD over any distance.

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