Quantum Photonics Laboratory, University of Warsaw

Homing Project


A research project within the HOMING Programme of the Foundation for Polish Science
Spectral engineering of entangled quantum light


Quantum entanglement manifests itself in the strongest possible correlations between two physical systems. Entanglement between photons forms the basis of ultimately secure cryptographic key distribution protocols – quantum key distribution (QKD). Furthermore, the field of quantum information processing (QIP), which holds promise to revolutionize computation and metrology, relies crucially on entanglement. Out of the photon’s degrees of freedom, the spectral-temporal is the most promising, yet the least explored in the context of QIP. Its assets are high dimensionality and compatibility with integrated optics, however manipulating spectral-temporal entanglement in a lowloss, low-noise manner is challenging. Here we will use the latest advances in fast electro-optic phase modulation techniques to perform significant modifications of the quantum state of spectrally entangled photon pairs. In particular, we will investigate their use for highly efficient spectrally encoded QKD.


Development of tools to enable efficient utilization of photon pairs entangled in the spectral-temporal degree of freedom for quantum information processing applications, such as high-dimensional quantum key distribution.


Construction of electro-optic devices enabling modification of spectral-temporal entanglement between pairs of individual photons. Training of young scientists towards their Master’s and PhD theses.


The project was 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 the Optical Quantum Technologies group at the University of Oxford. The project was financed by the HOMING programme of the Foundation for Polish Science. The total value of the project was 753 270 PLN. It was fully funded by the European Union’s European Regional Development Fund.


Measuring the single-photon temporal-spectral wave function
Alex O. C. Davis, Valérian Thiel, Michał Karpiński, Brian J. Smith
Phys. Rev. Lett. 121, 083602 (2018).

Experimental single-photon pulse characterization by electro-optic shearing interferometry
Alex O. C. Davis, Valérian Thiel, Michał Karpiński, Brian J. Smith
Phys. Rev. A. 98, 023840 (2018).

Large-scale spectral bandwidth compression by complex electro-optic temporal phase modulation
Filip Sośnicki, Michał Karpiński
Optics Express 26, 31307–31316 (2018).

Entanglement swapping for generation of heralded time-frequency-entangled photon pairs
Dashiell L. P. Vitullo, Michael G. Raymer, Brian J. Smith, Michał Karpiński, Lasse Mejling, Karsten Rottwitt,
Phys. Rev. A 98, 026836 (2018).


Michał Karpiński

Team leader

Filip Sośnicki

Postdoctoral Researcher

Ali Golestani

Postdoc at Department of Electrical and Computer Engineering, University of Toronto

Michał Mikołajczyk

PhD Student

Adam Widomski

PhD Student

Maciek Gałka

Master student,
Obtained his PhD in Cambridge

Prashant Dagale

Summer of 2018

Martin Luttmann

Summer of 2018

Łukasz Zinkiewicz
Monika Mikulicz

Summer of 2018

Tomasz Kowalczyk

Optoelectronics technician

Dominika Bondar

Working at Fluence.technology

Jadwiga Wilkens

Summer of 2019, financed by DAAD

Lyudmila Silantieva

Autumn of 2020, financed by BARI - Baltic Science Network

Sanjay Kapoor

PhD Student

Arifah Nurul Amaliah

Now, working in Vigo Systems

Cedric Hannemann

Summer of 2021

Jerzy Szuniewicz

PhD Student

Karol Piotrowski

Summer of 2023, financed by Candela Fundation

Doğukan Taş

Summer of 2023


Currently there are no available positions in the project. The project is finished.

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
✉ optics@fuw.edu.pl

Ludwika Pasteura 7, Warszawa, województwo mazowieckie, Polska