Ende August hat unsere Gruppe wieder ein "Hüttenseminar" gemacht. Dafür ist die gesamte Gruppe nach Schoppernau in Vorarlberg, Österreich gereist. Während der Woche haben wir über wissenschaftliche und auch nichtwissenschaftliche Themen gesprochen und konnten uns alle noch besser kennenlernen. Natürlich durften einige Wanderungen in den Bergen auch nicht fehlen. Auf dieser Seite sind noch mehr Informationen und Bilder zu finden.
Einzelphotonendetektoren sind unser Hauptwerkzeug in der Quantenoptik. Wir verwenden insbesondere supraleitende Einzelphotonendetektoren, da sie zu den besten Detektoren auf dem Markt gehören. Diese Detektoren erfordern jedoch kryogene Betriebstemperaturen. Das bedeutet für uns, dass wir nur eine begrenzte Anzahl von Detektoren in einem einzelnen Kryostaten betreiben können. Um Experimente mit mehr Detektoren durchzuführen und komplexere…
Diese Woche hat Amélie De Koninck den ersten Teil ihres freiwilligen Schülerinnenpraktikums in unserer Gruppe gemacht. Bei uns konnte Sie viele Eindrücke zur experimentellen Physik, speziell zur Quantenoptik, gewinnen. Zusammen mit Timon Schapeler, der das Praktikum betreut hat, hat Sie den Alltag im Labor erlebt. Das Ziel war es mit einem 4-bin multiplexed Einzelphotonendetektor die Statistik von abgeschwächtem Laserlicht zu untersuchen. Hierfür…
Yesterday we had our summer group event at the new Adventure Golf course in Paderborn at the Fischteiche. We had a lot of fun and our group members and their families enjoyed the beautiful weather and the sun. At the end of the evening we all had dinner together in an Italian restaurant.
In this two-dimensional histogram, the elliptical clusters correspond to different photon-number events registered by the SNSPD. This is a result from the principal component analysis (PCA), which was applied in this work.
Recently, it has been shown that so-called "superconducting nanowire single photon detectors" (SNSPD) can not only provide information about the presence or absence of photons, but also resolve the number of incident photons in a laser pulse. In this work, we investigated where this photon-number information is located on the electrical output signal (trace) of the SNSPD and how it can be best retrieved in an experiment. We did this by recording…
Last week four members of our group went to the Quantum 2.0 conference in Rotterdam, Netherlands. They enjoyed a great meeting and had a lot of time to network and talk about their work.
We contributed with two presentations and one poster:
Timon Schapeler talked about "Photon-number resolution with SNSPDs via statistical analysis of electrical traces" Frederik Thiele talked his work about "Opto-Electronic Operation of an SNSPD with a…
Two of our group members contributed to a conference in Gaeta, Italy last week. It was a meeting of the Horizon 2020 FET OPEN project Stormytune with the name "Spectral-Temporal Metrology with Tailored Quantum Measurements".
Aishi Barua presented her poster about "Investigating Homodyne Detection with Squeezed Light as the Local Oscillator". Lorenzo Procopio presented his talk about "Quantum Metrology Enhancement using Indefinite casual…
Last week three members went to the conference CLEO in Charlotte. The conference was about Lasers, electro-optics, and photonic applications. In addition, our former colleague Maximilian Protte joined us again and presented work which was realized in Paderborn. We presented our works in contributing talks and poster presentations:
Niklas Lamberty: Maximizing photon-number resolution from an SNSPD Maximilian Protte: Performing Balanced…
We welcome Lorenzo M. Procopio, who joined our group as a Post Doc.
After our 7th group reflection meeting last week, we had dinner together at Mundus in Paderborn.
Last week, four members of our group attended the spring meeting of the Atoms, Molecules, Quantum Optics and Photonics Section of the German Physical Society (DPG SAMOP). The conference took place from 10th to 15th of March in Freiburg. During the conference we presented the following contributions:
Niklas Lamberty - Maximizing photon-number resolution from an SNSPD (Talk) Isabell Mischke - Multiwavelength Characterization of Polarization…
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…
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.
