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A research project within the First Team Programme of the Foundation for Polish Science



Optical pulses form the backbone of photonic technologies. Their key characteristics are their temporal profile and their frequency spectrum. Experimentally, only one of these two parameters can be easily accessed, due to the incompatibility of time and frequency resolutions of detection and manipulation devices. The power of quantum mechanics manifests itself chiefly through the superposition principle: if two states of a system are valid quantum states, then their superposition is also a valid quantum state. The emerging quantum technologies are based on the ability to create, manipulate and detect quantum superpositions, which relies on the ability to access conjugate variables, such as the time and frequency for single-photon pulses. Here we will use novel tools to experimentally access temporal and spectral characteristics of quantum light pulses. We will manipulate and detect their quantum superpositions, and demonstrate their applications in quantum networks and metrology.


Experimentally modify the spectral and temporal properties of single-photon pulses. We will convert photons from solid-state emitters to photons fully compatible with high-bandwidth telecommunication channels. We will investigate applications of shaped quantum light pulses in quantum metrology.


Construction of electro-optic and nonlinear optical devices enabling modification of spectral-temporal properties of single-photon pulses. Training of scientists towards their Master’s and PhD theses and training of post-doctoral researchers.


The project is carried out at the Quantum Photonics Lab at the Faculty of Physics of the University of Warsaw under the lead of Dr Michał Karpiński, in collaboration with prof. Nicolas Treps from Sorbonne University in Paris, prof. Peter G. R. Smith at the Optoelectronics Research Centre in Southampton, UK, prof. Christian Becher at the Saaraland University in Germany, and Dr Robert Keil form the University of Innsbruck in Austria! The project is financed through the FIRST TEAM programme of the Foundation for Polish Science. The total value of the project is 1 996 995 PLN (approx. 460 kEUR). It is fully funded by the European Union’s European Regional Development Fund.


Aperiodic electro-optic time lens for spectral manipulation of single-photon pulses
Filip Sośnicki, Michał Mikołajczyk, Ali Golestani, Michał Karpiński
Applied Physics Letters 116, 234003 (2020) (featured article).
arXiv preprint arXiv:2004.07195

More coming up…
(click here for a full list of QPL publications)


Michał Karpiński
Team leader
Filip Sośnicki
PhD Student
Michał Mikołajczyk
PhD Student


We are looking for a post doctoral researcher! If you are a talented theorist ready to develop the theory of unitary spectral shaping and study its applications in quantum communications and metrology or an experimentalist with experience in optics of femtosecond pulses or solid-state-based single photon sources – please apply! We offer a competitive salary (2000+ EUR/month net) for 2+ years, interesting research topics as well as collaboration opportunities both within the vibrant research community in Warsaw and internationally with our partners.

The position will be formally announced soon. In the meantime we encourage you to informally contact Michal Karpinski mkarp at fuw. edu. pl to learn more!

Find us

We are located at the Ochota Campus of the University of Warsaw, in the interferometrically stable basement of the Geophysics Building (room 021A).
We are a short tram ride from the centre of Warsaw. The Warsaw Chopin Airport is just a 20-minute bus ride away. On sunny days we escape the darkness of the lab to enjoy the adjacent Pole Mokotowskie Park.

🏠ul. Pasteura 7, 02-093 Warszawa, Poland
(+48) 22 55 32 740, 46 872