Montréal Quantum Photonics Seminar Series

📍 Pavillon J.-Armand-Bombardier 1035, Polytechnique Montréal
🗓️ Monday, September 25th/2023
🕜 13:00 hr

Electro-optic spectral shaping of single-photon pulses

Filip Sośnicki

University of Warsaw

Abstract: One of the essential tasks in the field of quantum optics is the ability to fully control single photons, meaning controlling them in all degrees of freedom (DoF). While many experiments demonstrated control of single photons in polarization or transverse-spatial mode, one still requires methods for unitary, phase-only manipulation in the time-frequency DoF. In my presentation, I will show a technique for shaping single photons in time and spectrum by employing electro-optic phase modulation (time lenses) combined with dispersive propagation. I will show our recent results on tuning single-photon’s center wavelength and spectral bandwidth. I will primarily focus on using photonically generated RF signals, achieving very high modulation stability in 24 hours. I will also show employing complex phase modulation patterns for spectrally compressing single photons by more than two orders of magnitude down to hundreds of MHz of spectral width.

Bio: Filip Sośnicki is a researcher at the Faculty of Physics at the University of Warsaw, where he works at the Quantum Photonics Lab led by Dr. Michał Karpiński. There, in 2016, he graduated with an MSc (with distinction) in the theoretical physics by numerically studying electro-optic time lensing of light. Later, in 2023, he defended his doctoral thesis (with distinction) on the topic of coherent shaping of quantum light pulses in the spectro-temporal degree of freedom by developing an electro-optic experimental platform for time lensing.

Contact: nicolas.quesada@polymtl.ca