Spectro-temporal shaping of quantum light by electro-optic phase modulation

One of the most important tasks in quantum optics is the ability to fully control single photons, meaning manipulating 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 method for shaping single photons in time and spectrum by employing electro-optic phase modulation combined with dispersive propagation. I will show our recent results on tuning single-photon and photon-pair center wavelength and spectral bandwidth. In particular, I will focus on using photonically generated RF signals, achieving very high modulation stability throughout 24h. I will also show employing arbitrary phase modulation patterns for spectrally compressing single photons by more than 2 orders of magnitude down to hundreds of MHz of spectral width. The presented results of single-photon spectral shaping will pave the way toward quantum interfaces interconnecting various quantum devices in hybrid quantum networks.