Barz Group

Quantum Information & Technology

Photonic quantum technology

Our research is grounded in the study of single photons and quantum states of light.

These single photons and multiphoton entangled states are pivotal for delving into fundamental quantum physics and driving the evolution of quantum technologies.

We cover a diverse range of aspects of single photons, from investigating their quantum properties to advancing integrated photonic technology, and ultimately applying these significant advancements in quantum computing, quantum communication, and quantum networking.

Our experiments are dedicated to pushing the boundaries and exploring the full potential of photonic quantum technologies.

Exploring single photons

The foundation of our research lies in exploring and understanding the behavior of quantum states of light. This encompasses single photons as well as multiphoton entangled states.

Our interest extends to both the fundamental aspects of multiple photon interference and the generation of photonic states suitable for quantum-technology applications.

We investigate various methods of photon generation, ranging from the use of nonlinear crystals to semiconductor quantum dots, working towards producing photons that are as pure and identical as possible.



Integrating single photons

We engage in the field of integrated photonics, where we investigate diverse platforms. Our objective is to enhance and miniaturise optical setups, thus enhancing their stability and scalability. This opens up new possibilties for fundamental scientific research and advances in photonic quantum technologies.

Within our work, we develop integrated optical circuits, employing a range of design methods  to realise complex integrated optical networks. Our efforts encompass the creation of networks suited for universal quantum operations and the creation of designs tailored to specific quantum tasks.

Our laboratories are equipped with comprehensive, automated setups for characterising integrated photonics.



Quantum computing with photons

We harness single photons to realize quantum computing. Photons possess distinct characteristics in the realm of quantum system as they do not interact directly and travel with the speed of light, imposing precise demands on the construction of photonic quantum computers.

We build photonic quantum processors that enable the execution of small-scale quantum computations. Our processors adopt a measurement-based approach, where computations are carried out through measurements on highly entangled photonic resource state.

Consequently, our research addresses the challenge of efficiently generating these resource states with best quality.


Quantum networking with photons

Our objective is to establish quantum networks capable of facilitating both quantum communication and quantum computing.

In the realm of quantum communication, we place particular emphasis on the implementation of networked quantum tasks that involve more than 2 parties. We actively generate and employ multipartite entangled states, exploring their utility in a variety of communication scenarios, such as networked quantum communication.

Another focus of our research is quantum cloud computing and the question how distributed quantum computing can be realized in quantum networks. Quantum computers do not only offer speed-ups in data processing, but also allow one to preserve the privacy of a computation. This allows performing delegated computations in quantum networks, where clients can access the resources of a more computationally-powerful quantum server without divulging the content of the requested computation.



Our research encompasses a wide range of disciplines, including physics, engineering, and computer science, combining their unique perspectives to advance the field.


To learn more about our research, have a look at our publications or at the highlight projects below.

Information on funding can be found here.

[Pictures on this page: La Rici Photography]


This image shows Stefanie Barz

Stefanie Barz

Prof. Dr.

Professor: Quantum Information & Technology

This image shows Cornelia Bertsch

Cornelia Bertsch


Barz Office - Administration

Alena Henzler


Barz Office - Administration

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