The power of 

optical micro-cavities

We help you to use the incredible power of optical micro-cavities to enhance light-matter interaction for quantum technologies & research and new insights through ultra-sensitive absorption microscopy

Cavity quantum optics platform 

Quantum optics cavity experiments with solid state materials at 4K

Our microscopic high finesse cavity enhances light-matter interactions for applications in quantum computation, single-photon sources, quantum networks and other cutting edge research.

Use our quantum optics platform to sample thousands of inhomogeneous nanosystems like quantum dots, NV-centers, or 2D-Materials in a single run with the ability to perform quantum optics experiments on every single one of them. 

Ultra-sensitive absorption microscope

Absorption spectroscopy of low-dimensional materials  

Our microscope provides spatial-, spectral-, and time-resolved absorption measurements with exceptional sensitivity.

Measure spectrally and spatially resolved absorption of nanosystems at the parts-per-billion level. Gain new insight for material research and see what nobody else saw before.

Microscopic cavity mirrors

Microscopic cavity mirrors for your experiment and application

Highly reflective, microscopic fiber-based cavity mirrors for quantum optics, single photon sources, signal enhancement, strong light-matter interaction, filters, ion traps ... 

Precision-machined mirror profiles and high reflection coated cavity mirrors from pioneers in fiber-cavity fabrication. First commercial source. 10 years of experience in manufacturing and operating high finesse fiber-based cavities. Choose between stock and custom mirrors.

Scanning cavity technology

How our scanning cavity system works:

  1. An optical fiber with a small concave mirror.
  2. A large planar mirror.
  3. Place your sample.
  4. Find suitable nanoparticle.
  5. Couple to quantum systems / do spectroscopy.
  6. Publish!
  7. Repeat


 Our happy customers include

Harvard University
Max Planck Institute of Quantum Optics
TU Wien


During our work with fiber-based optical microresonators, we realized the enormous power of this technology and its great potential in many research areas. We want to cut down the complexity and time it takes to build and operate an optical fabry-perot microcavity to enable scientists from various fields to boost their research.

On this premise we develop complete setups including highly reflective mirros, mechanical design as well as electronics, software, and consulting to get our customers an operating microcavity setup in various environments as fast as possible. Our ultimate goal is to provide a "turn-key" solution that unlocks the power of optical microresonators in every laboratory.


Qlibri originates from the groups of David Hunger at KIT, Alexander Högele, and Nobel prize laureate Theodor W. Hänsch at LMU Munich and the Max-Planck-Insitute of Quantum Optics, where fiber-based microresonators were pioneered.

Our team provides years of expertise in micro-cavity and nanophotonic research.

Founders: Dr. Thomas Hümmer, Dr. Jonathan Noé, Dr. Manuel Nutz, Dr. Michael Förg

We are lucky to be supported by excellent scientific advisors:

Prof. Theodor W. Hänsch, LMU  

Prof. David Hunger, KIT

Prof. Alexander Högele, LMU


Booth @ APS march meeting

We have a booth at the march meeting of the American Physical Society in Minneapolis!

Funding for QlibriNANO

We got selected from the European Innovation Council for the prestigous EIC Transition funding. We are building the wold's most sensitive absorption microscope within the project. Find the full news update here.

New cavity controllers

Years of hard work has now paid-off in our new powerful, ultra-low noise cavity controllers:  20-bit DACs, switchable digital and analogue filters, and fully FPGA-programmable 50MHz bandwidth data acquisition.

Seeing the Unseen

Check out our new article about the capabilities of microscopy of nanomaterials based on optical microresonators published by Imaging & Microscopy!

First Qlibri Quantum installation

Last week we successfully installed our first quantum optics platform in the labs of Klaus Jöns at Universität Paderborn. It was an exciting experience. Thanks to all who contributed.

Paper on defects in 2D-semiconductors

Want to see an example of how we measure the tiniest amount of absorption in nanoscale structures? Read our latest publication and learn about one of the many applications of our cavity-enhanced optical microscope! Thanks to our collaborators at the Walter Schottky Institute!

Watch conference talk

Qlibri participated in the workshop 'Bridging the Gap: Nano meets Quantum' in Venice organised by CeNS and MCQST. It was a wonderful event. For all who missed the opportunity to join, you can watch the talk of our CEO Jonathan Noé online now.

New project

Qlibri is part of the Muquabis project. It is using quantum-bio-sensing and bio-imaging in order to overcome the limitations of state-of-the-art tools for cardiac imaging and spectroscopy. 

We are hiring

Due to strong customer demand we are quickly expanding. For physicists, electrical and mechanical engineers and administrative staff we offer unique experience in creating fundamentally new awesome tools for cutting edge research! See open positions and just get in touch with us!

Qlibri GmbH is incorporated

Qlibri GmbH is founded.

Qlibri joins Quantum repeater research project

Qlibri is part of the project QR.X for developing a quantum repeater link based on color centers in diamond. We will contribute a stable, actively length-locked and flexible micro-cavity that can be interfaced with microwave and RF-bias lines.

Milestone in microscopy sensitivity

News from the lab: First complete hyperspectral microscopy image with noise floor well below 0.001% recorded in less than a second.

First cavity fiber mirrors delivered

Our first micro-mirrors are delivered to our research customers in the US and Spain.

Prestigious start-up funding

We received the prestigious EXIST Forschungstransfer start-up grant from the German Federal Ministry for Economic Affairs and Climate Action (BMWK).

Live absorption measurement at conference fair booth

We had our first booth at the industry exhibition of the Quantum Science and Information Technologies Fall meeting of the German physical society (DPG). We showed a live demonstration of absorption microscopy of carbon nanotubes resolving absorption at the 0.0001% level.


We received the prestigious Nano innovation Award from the Center for NanoScience (CeNS).

Live absorption measurement on conference

 4.3.2019 On the Single-Molecule Sensors and NanoSystems International Conference we showed the first life absorption measurement of our microscope. 

Live stable cavity resonator on conference

We love the challenge. Where other exhibtors just bring dummies to their booths we demonstrated on the European Quantum Technologies Conference in Grenoble 100fm resonator stability of our fully scannable cavity quantum platform (during the noisy poster session and in our hotel room).

The Idea: a company dedicated to micro-cavities

The idea to build a company offering researchers and industry the power around fiber micro-cavities is born at the LMU in Munich.

Awards & funding

We are happy to be supported by the following institutions, prizes and grants