News

We build photonic circuits for quantum optics with the material system lithium niobate. The material system enables us to realize several devices such as quantum light sources and modulators. For several applications we need to cool the material system down to cryogenic temperatures (below 10K). The challenge with photonic circuits is to maintain a high device performance at cryogenic temperatures. We managed to maintain a good performance for…

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We welcome Aishi Barua as a new PhD student in out group. 

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The latest episode of the "PaderPhy - Der Paderborner Physik Podcast" features Prof. Bartley. Check it out here.

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Dr. Maximilian Protte talks about our newest publication on low-noise balanced homodyne detection with superconducting nanowire single-photon detectors.

We just posted a new video about our latest publication in Optica Quantum from Maximilian Protte and Timon Schapeler. In this video Maximilian talks about the experiment and the results. It can be found here, it was edited by Jessika Bruns. The original news article can be found here and the publication here.

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Our former group member Maximilian Protte was awarded for an excellent dissertation at the 2024 New Year’s Reception at Paderborn University.

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Phase-dependent nonlinear quadrature operator for the vacuum state and a weak coherent state [https://doi.org/10.1364/OPTICAQ.502201].

Have you ever thought of using superconducting single-photon detectors for homodyne detection? In our newest publication we show how we used superconducting nanowire single-photon detectors (SNSPDs) to study the continuous variables of optical quantum states using homodyne detection. From the joint click statistics of two SNSPDs we measured the phase-dependent quadrature of a weak coherent state, which was interfered with a continuous wave local…

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As we are part of the Institute for Photonic Quantum Systems (PhoQS), multiple members of our group participate in the PhoQS school program. We want to raise the interest of school students in the fascinating world of physics and quantum optics. We visit physics classes of the upper school and give exclusive insights in the physics studies and what it is like to work in an academic research group. Moreover, this is a great chance for the pupils…

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Max' Goodbye

Yesterday we said goodbye to Max, as he will leave the group after almost five years in our group. We met in the afternoon to have eat pizza together, play games and had a lot of fun, especially at "Uno mit Zwischenlegen". Thanks for all your work, and being a big part of our group!

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Together as a group we went to the christmas market to have some nice food. Besides that it was a nice opportunity to chat.

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We congratulate all students who graduated this year in the faculty of natural sciences. In particular all students which graduated from our group: Markus Brieden, Stefan Vorwerk, Maximilian Protte, Niklas Schröder and Frederik Thiele.   

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We congratulate Frederik Thiele who successfully defended his PhD thesis titled "Opto-electronics for quantum communication at cryogenic temperatures" and was awarded the "Dr. rer. nat." degree by the Faculty of Science at Paderborn University.

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Four people from our group contributed with posters at the European Quantum Technologies Conference in Hannover, Germany. Nina Lange showed her work about "Cryogenic Degenerate Spontaneous Parametric Down-Conversion" Frederik Thiele presented his poster titled "All-optical operation of a superconducting opto-electronic circuit" Thomas Hummel showed a poster about "Cryogenic electronics for integrated SNSPDs" Timon Schapeler presented his work…

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We contributed with one presentation and one poster to the Frontiers in Optics + Laser Science Meeting in Tacoma, USA. Maximilian Protte presented a poster about "Strong-Field Homodyne Detection with Superconducting Nanowire Single-Photon Detectors". Thomas Hummel presented at talk about "Gated- and optical biasing for SNSPDs".

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We congratulate Niklas Schröder for successfully defending his bachelor thesis about "Laser intensity stabilization for experiments in quantum optics".

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Some of our group members joined the workshop "PHOTONICS FUTURE - Profound | Equal | Inclusive". This workshop was specifically aimed at female scientists, who gave insights into their work and career. For more information visit the TRR142 website here.

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