SubcycleQ

SubcycleQ Subcycle quantum optics is an emergent research field concerned with ultrafast measurements of quantum light. This python package includes two contributions to the research field: An approach to describe the action of optical elements in a subcycle mode basis, including nonlinearities. This is necessary to calculate the reconstructable temporal mode functions from field-correlation measurements, analyse correlations in the time domain prevalent in the quantum pulse and reconstruct the wave function of Fock states [1]. An implementation of the generalized Bloch-Messiah decomposition enabling a phase-space input-output relation [2]. References If you use this code in your research, please cite: [1] Emanuel Hubenschmid, Guido Burkard, Time-domain field correlation measurements enable tomography of highly multimode quantum states of light (2026), Commun. Phys. [2] Emanuel Hubenschmid, Victor Rueskov Christiansen, Phase-space open-systems dynamics of second-order nonlinear interactions with pulsed quantum light (2025), arXiv:2512.03933 A maintained version of this code is available at: https://gitlab.inf.uni-konstanz.de/emanuel.hubenschmid/subcycleq