Towards integrated quantum photonics at telecom wavelengths

11 05/2015

Monday, 11 May. 2015, 13:00 - 14:00

Presenter: Lorenzo Magrini; University of Rome La Sapienza, Italy
Host: M. Aspelmeyer
Where: Schrödingerroom, 4th Floor, Boltzmanngasse 5, 1090 Wien

Integrated quantum photonics in the telecom band is very appealing since it could take advantage of the optical network infrastructure developed for classical communications. In this framework, femtosecond laser written integrated photonic circuits, already assessed for quantum information experiments in the 800 nm wavelength range, have great potentials. In fact, these circuits, written in glass, can be perfectly mode-­‐matched at telecom wavelength to the in/out coupling fibers, which is a key requirement for a low-­‐loss processing node in future quantum optical networks. In addition, for several applications quantum photonic devices will also need to be dynamically reconfigurable. The aim of this work was to realize and characterize a source of single photon quantum states, suitable for long distance quantum communication, i.e. a single photon source in the telecom band. Furthermore this thesis aimed to use such a single photon source within a femtosecond laser written integrated reprogrammable optical circuit, particularly designed for telecom wavelengths, addressing, together with the long distance quantum communication problem, that of scalability of photonic circuits. State-­‐of-­‐the-­‐art manipulation of single and two-­‐photon states is demonstrated, showing the potential of this platform to realize complex integrated circuits for quantum information applications.