The MQO group studies fundamental physics and develops quantum applications with quantum states of light at the mesoscopic scale, which is underpinned by enabling technology. Mesoscopic quantum optical states consist of several 10, 100 and 1000 non-classically distributed photons. From a fundamental perspective, these can be used to explore quantum physics at energy scales that are visible to the naked eye, bringing some of the highly counterintuitive phenomena of quantum mechanics to a human scale. In addition, this scale is crucial for demonstrating true quantum improvement over classical systems in many areas, including metrology, computation and communication.

In this context, the MQO group's research can be divided into three sub-areas: Development of the enabling technology for mesoscopic quantum optics, fundamental physics with mesoscopic quantum states, and applications of mesoscopic quantum optics. Learn more on our research page.


Our highlighted video

In August 2022 we organized a seminar for our group in the mountains of austria. For a week we stayed in the Ravensburger Hut at almost 2000-meter altitude located close to Langen am Arlberg. You can find more information here.

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Faculty Celebration of the Natural Sciences

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Congratulations to Frederik Thiele

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MQO at EQTC in Hanover, Germany

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MQO at FiO+LS in Tacoma, USA

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Congratulations to Niklas Schröder

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Workshop on equality and inclusion

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Visit at the University of Iowa

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New Publication from Frederik Thiele

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Congratulations to Stefan Vorwerk

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Summer-Event at Lippesee

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All optical operation of a superconducting photonic interface
F. Thiele, T. Hummel, A.N. McCaughan, J. Brockmeier, M. Protte, V. Quiring, S. Lengeling, C. Eigner, C. Silberhorn, T. Bartley, Optics Express 31 (2023).
Dispersion control with integrated plasmonic metasurfaces
R. Geromel, P. Georgi, M. Protte, T. Bartley, L. Huang, T. Zentgraf, in: CLEO: Fundamental Science 2023, Optica Publishing Group, 2023.
Degenerate photons from a cryogenic spontaneous parametric down-conversion source
N.A. Lange, T. Schapeler, J.P. Höpker, M. Protte, T. Bartley, Physical Review A 108 (2023).
Compact Metasurface-Based Optical Pulse-Shaping Device
R. Geromel, P. Georgi, M. Protte, S. Lei, T. Bartley, L. Huang, T. Zentgraf, Nano Letters 23 (2023) 3196–3201.
Nanosecond gating of superconducting nanowire single-photon detectors using cryogenic bias circuitry
T. Hummel, A. Widhalm, J.P. Höpker, K. Jöns, J. Chang, A. Fognini, S. Steinhauer, V. Zwiller, A. Zrenner, T. Bartley, Optics Express 31 (2023).
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We are a diverse team, that works on different topics and projects. Together we find answers and are looking for people to enrich our team. Take a look at our job advertisments and apply today. We look forward to hearing from you.



The output of the MQO Group does not only include publications. All output to be disseminated digitally, such as videos and analysis scripts, can be found via our resource page.


Networks and Projects


Institute for Photonic Quantum Systems

ERC: European Research Council

QuESADILLA: Quantum Engineering Superconducting Array Detectors in Low-Light Applications

TRR 142: Tailored Nonlinear Photonics: From Fundamental Concepts to Functional Structures

CeOPP: Center for Optoelectronics and Photonics


Quantum communication with integrated optics in the context of superconducting electronics


Photonic Integrated Quantum Computer


Photonic quantum computers

Where you can find us

09.10.2023 - 12.10.2023

Frontiers in Optics + Laser Science Meeting in Tacoma, USA

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16.10.2023 - 20.10.2023

European Quantum Technologies Conference in Hannover, Germany

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Prof. Dr. Tim Bartley

Mesoscopic Quantum Optics

Room P8.3.13
Paderborn University
Pohlweg 47-49
33098 Paderborn