Quantum photonic engineering : from pure photon sources to integrated circuits

Vous êtes cordialement invités au séminaire du Dr. Dmytro KUNDYS, Université Heriot-Watt d'Édimbourg, Écosse, Royaume-Uni, organisé par l'IPCMS.

Résumé :

In recent years, quantum technology has seen an immense development demonstrating the variety of platforms allowing coherent control of qubits - quantum bits of information. Quantum optics promises creation of superfast quantum computers and sensors, which can outperform classical counterparts thanks to the utilisation of photons, the ideal carriers of quantum information. Integrated optics is one of the promising routes to create such computers from waveguide networks on a chip with an ability to control the path and degree of freedom (such as polarization or frequency) of single photons, thus forming the quantum logic gates needed for linear optics quantum computation. In my talk I will review our recent progress on developing of sources of single photons for the above tasks using parametric down-conversion and group-velocity matching with tailored nonlinearities. Such sources of pure single photons are paramount for successful quantum information processing. Our engineered single photon sources exhibit simultaneously enhanced single photon purity and heralding efficiencies. I will describe how such sources, embedded into Sagnac interferometers can be used to generate ultrafast photon cluster states entangled in the polarisation degree of freedom. Also at the end of my talk I will review some of our previous results on non-classical multiphoton interference experiments of boson sampling and quantum teleportation performed on a photonic chip.