Środowiskowe Seminarium z Informacji i Technologii Kwantowych

Quantum mechanics can be used to overcome several crucial technological challenges. Among the many quantum platforms, photon states are of interest because of their high coherence, ease of transmission, and ease of manipulation. These properties make optical quantum states particularly interesting for applications in secure communications and quantum computation. However, the complexity of optical (and other) quantum sources limits the access to, control over, and scalability of generated states. On-chip quantum photonics can address these limitations, as the generation of complex photon states on a compact platform will enable low-cost, straightforward experimental access to states, enabling large-scale implementations. However, on-chip optical quantum sources have until now been limited to the generation of individual two-photon states and cannot yet reach the performances of non-integrated optical sources.In my talk, I will present a new approach for the generation of optical quantum states on a compact chip. I will show that optical frequency comb sources can be used to generate quantum states of light, addressing several performance and scalability issues. In particular, we demonstrated the first generation of pure heralded single photons, cross-polarized photon pairs, as well as two- and multi-photon entangled quantum states in optical frequency combs, distributed over hundreds of frequency modes, using an on-chip nonlinear micro-cavity.