The graduates in our group were honoured at this year's faculty ceremony. The photo (from left) shows Paul Jesper Vatter (Bachelor), Gerrit Samuel Claaßen (Bachelor), Niklas Lamberty (Master), Prof Tim Bartley, Julian Rische (Bachelor) and Robin Wall (Bachelor).
Special mention should be made here of Niklas Lamberty, who was also honoured for his outstanding Master's thesis (see separate article here) and Robin Wall, who gave the graduation…
In our latest publication, Nina Lange characterizes cryogenic nonlinear frequency conversion in titanium-indiffused waveguides on lithium niobate. The single-photon source generates photon pairs at wavelengths of 950 nm and 1560 nm.
The publication can be found open access in Optics Express: https://doi.org/10.1364/OE.578108
We would like to welcome Umair Ashraf Mir, who joined our group as a PhD student.
Last Friday we had our biannual Group Reflection Meeting. We started with breakfast and then we take time to discuss important topics, do our safety briefing and plan future projects.
In the evening, we all wet together to have Pizza.
On 30 September and 1 October 2025, the final symposium of the SFB/TRR 142 took place in Paderborn at the HNF. On the two days, the projects of the three main areas of the last 12 years were summarised in three presentations, there was a poster session to go into the results in more detail and presentations by invited guests.
Prof Tim Bartley summarised the research field C and Nina Lange gave an overview of the research in the poster session.
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On the European Conference on Applied Superconductivity (EUCAS) two group members presented their work.
Johanna Biendl will present a poster with the title “Addressing Pyroelectric Damage on SNSPDs to Enhance Detector Yield on Lithium Niobate”Maximilian Protte will present a poster about “Signal Processing of Single-Photon Detectors with Superconducting Electronics for Photonic Applications”
Arrival-time histograms of the rising edge of SNSPDs traces for different mean photon numbers. Underlying peaks correspond to different photon numbers (rightmost peaks: one-photon peaks)
Our group has collaborated with Dr. Mariia Sidorova and the Integrated Quantum Optics Group on a new publication in the journal "APL Photonics". The paper by Dr. Mariia Sidorova and Timon Schapeler analyzes the physics of multi-photon absorption in superconducting nanowire single-photon detectors (SNSPDs) and provides a physical model for photon-number dependent jitter mechanisms in the detection process. These findings are important, e.g., for…
We congratulate Sven Marginean for successfully defending his Bachelor thesis with the title “FPGA-based real-time photon number resolution of SNSPDs”.
Last Thursday we organised this year's summer party. Our group members and families met at the minigolf course on the Lieth in the afternoon to play minigolf in four smaller groups. We had a lot of fun and were able to enjoy the great weather and the beautifully designed mini golf course.
Afterwards, we met up at Prof Tim Bartley's to spend the evening together. Everyone brought something to eat so that nobody had to go hungry. We spent the…
We congratulate Gerrit Claaßen for successfully defending his Bachelor thesis with the title “Characterization and modulation of superconducting detector circuits”.
We congratulate Robin Wall for successfully defending his Bachelor thesis with the title “Spectral characterization of strongly-pumped spontaneous parametric down conversion”.
Our group contributed to the Quantum 2.0 conference in San Francisco, California this year. Niklas Lamberty presented a talk with the title "Cryogenic Feedforward of a Photonic Quantum State".
Our group has a new publication in the journal "Optica". The paper by Dr. Frederik Thiele and Niklas Lamberty demonstrates how a cryogenic circuit for controlling photons is made possible for the first time, and faster than previously possible.
More information can be found in the Paderborn University press release.
The publication itself can be found here.
Last Friday the MQO group gathered to have a last dinner together with our guest researcher Phichai Youplao, who stayed in our group for one year. He joined our group through the ERC project (QuESADILLA) to work on a quantum key distribution (QKD) scheme he proposed.
Besides working in the lab to build his experiment, he also joined our “hut seminar” in Austria last year, which was a lot of fun.
