Abstract: Discerning quantum and classical features in a real-world scenario is an intriguing task, especially when the system under scrutiny has many degrees of freedom. In optics the notion of coherence is of central importance, and it also comes in two flavours: classical and quantum. In this talk I will present a simple yet powerful technique to control and discern classical and quantum coherences in a photonic quantum network, an object that may encompass a large number of modes, all possibly spatially separated. Finally, I will outline the experimental results from the application of this technique to photonic networks implemented in the time-domain.
Reference: Th. Nitsche, Syamsundar De, S. Barkhofen, E. Meyer-Scott, J. Tiedau, J. Sperling, A. Gabris, I. Jex, and Ch. Silberhorn, Phys. Rev. Lett. 125, 213604 (2020)