Distribution of GHz Sequential Time-Bin Entanglement in a Metropolitan Fiber Network

Autor(en)

Martin Achleitner, Alessandro Trenti, Philip Walther, Hannes Huebel

Abstrakt

Efficient generation and high-quality distribution of entanglement is becoming increasingly more relevant in the field of quantum technologies, with important applications such as multiparty computation as well as quantum key distribution (QKD) on the rise. Quantum communication protocols based on entanglement offer an inherent quantum based randomness for key generation and provide in general higher security compared to prepare and measure implementations. Moreover, the future quantum internet will also be based on the distribution of entanglement for securely connecting quantum computers in a network. In this work we show the feasibility of using sequential time-bin entangled states for quantum key distribution in metropolitan networks using off-the-shelf components. The time-bin encoding ensures high fidelity distribution robust against random polarisation fluctuations occuring in optical fibers. Modulated laser pulses in the GHz frequency range are used to generate time-bin entangled photon pairs. The entangled photons are then sent over an about 30 km long (9.5 dB loss) fiber link within the Vienna fiber network, showing high degree of distributed entanglement with a measured 93% quantum visibility.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Austrian Institute of Technology

Journal

IEEE Journal of Selected Topics in Quantum Electronics

Band

31

Anzahl der Seiten

8

ISSN

1077-260X

DOI

https://doi.org/10.1109/JSTQE.2025.3539921

Publikationsdatum

09-2025

Peer-reviewed

Ja

ÖFOS 2012

103025 Quantenmechanik, 103026 Quantenoptik

Schlagwörter

ASJC Scopus Sachgebiete

Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/0927a443-02c4-4eae-98d1-14f4c4747be7