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Martin Achleitner

Publications and source records attributed to Martin Achleitner.

6 recordsLinked to original sources
arXiv2026

Distribution of GHz sequential Time-bin Entanglement in a Metropolitan Fiber Network

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 30km long (9.5dB loss) fiber link within the Vienna fiber network, showing high degree of distributed entanglement with a measured 93\% quantum visibility.

quant-ph↗
arXiv2025

Secure Multi-Party Biometric Verification using QKD assisted Quantum Oblivious Transfer

We present a practical implementation of a secure multiparty computation application enabled by quantum oblivious transfer (QOT) on an entanglement-based physical layer. The QOT protocol uses polarization-encoded entangled states to share oblivious keys between two parties with quantum key distribution (QKD) providing authentication. Our system integrates the post-processing for QKD and QOT, both sharing a single physical layer, ensuring efficient key generation and authentication. Authentication involves hashing messages into a crypto-context, verifying tags, and replenishing keys through a parallel QKD pipeline, which handles both key post-processing and authentication. Oblivious keys are generated over 12.9 km with a channel loss of 8.47 dB. In a back-to-back setup, a QOT rate of $9.3\times10^{-3}$ OTs/second is achieved, corresponding to 1 minute and 48 seconds per OT, primarily limited by the entanglement source. Using pre-distributed keys improved the rate to 0.11 OTs/second, or 9.1 seconds per OT. The considered QOT protocol is statistically correct, computationally secure for an honest receiver, and statistically secure for an honest sender, assuming a computationally hiding, statistically binding commitment, and a verifiable error-correcting scheme. A practical use case is demonstrated for privacy-preserving fingerprint matching against no-fly lists from Interpol and the United Nations. The fingerprint is secret-shared across two sites, ensuring security, while the matching is performed using the MASCOT protocol, supported by QOT. The application required 128 OTs, with the highest security achieved in 20 minutes and 39 seconds. This work demonstrates the feasibility of QOT in secure quantum communication applications.

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arXiv2023

Datacom-Agnostic Shortwave QKD for Short-Reach Links

We investigate the co-existence of 852-nm and 1550-nm QKD with carrier-grade 4x25-Gb/s/$\lambda$ LANWDM over a short-reach interconnect. Shortwave QKD yields a higher key rate and is insensitive to Raman noise, as opposed to 1550-nm QKD.

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arXiv2021

Quantum RNG Integration in an NG-PON2 Transceiver

We propose a minimally invasive optical overlay for time-interleaved QRNG operation in NG-PON2 transceivers. We experimentally demonstrate that random numbers can be generated at a 0.5 Gb/s rate and validate the randomness through statistical tests.

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arXiv2020

Flexible Cloud/User-Centric Entanglement and Photon Pair Distribution with Synthesizable Optical Router

The practical roll-out of quantum communication technologies in optical networks and the adoption of novel quantum applications demand the distribution of single or entangled photons. Flexibility and dynamicity are paramount for the provision of quantum resources, in order to scale with the number of users and to meet the demand of complex network architectures. We present a quantum network architecture that features this degree of reconfigurability, without being restricted to a rigid physical-layer network based on purely passive multiplexing componentry. We leverage spectral assets of photon-pair sources, from the short-wavelength band to the L-band, and agile spatial switching at a remote optical network node, in order to realize a flexible distribution map that features different flavors, reaching from cloud-centric to user-centric quantum connectivity. Photon pair distribution is experimentally demonstrated between five users in a 17-km reach, tree-shaped optical network, with high visibility entanglement shared between three users of the network. Simultaneous distribution of photons to more than one user is enabled and the delivered photon rate can be dynamically adjusted. Penalty-free operation is confirmed for integrating a co-existing classical control channel within the quantum.

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