Berlin 2024 – scientific programme

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QI: Fachverband Quanteninformation

QI 3: Quantum Communication

QI 3.8: Talk

Monday, March 18, 2024, 11:30–11:45, HFT-TA 441

Towards High Throughput Quantum Key Distribution with Quantum Dots — •Koray Kaymazlar, Martin von Helversen, Timm Gao, Lucas Rickert, Daniel Vajner, and Tobias Heindel — Institute of Solid State Physics, Technical University of Berlin

Quantum key distribution (QKD) systems using polarization encoding require fast modulation of the polarization states of single-photon pulses. Here, we present a prototype for a QKD system based on the BB84 protocol which aims for secure key generation at high rates. The setup consists of electronics based on a field programmable gate array (FPGA) and a digital to analog converter (DAC) driving a fiber-based electro optic modulator for quantum light from a cavity-enhanced semiconductor quantum dot emitting in the spectral range around 900 nm or 1550 nm. We characterize and optimize the performance of this setup in terms of secure key rate.

We also considered practical issues which are synchronization of sender (Alice) and receiver (Bob) side of the system, alongside random bit handling in the sender*s end. Various solutions were implemented to address these practical challenges, followed by an evaluation to discern their impact on the system*s functionality.

Keywords: Quantum Key Distribution; Quantum Dot; Single Photon