NQCP Life in Quantum - Professor Leif K. Oxenløwe, DTU Electro

Photonic Integrated Circuits for Quantum Applications

Photonic integrated circuits can be used to create exquisite quantum states for photons to occupy, and to use these photons to perform advanced quantum information processing. One may create extremely "pure" single photons, the prerequisite for quantum interference, the basis for using photons to perform quantum information processing. One may create high-dimensional quantum states based on precise superpositions of spatial quantum states, such as orbital angular momentum modes, in order to e.g. increase the information rate when transmitting quantum bits in quantum communication systems. One may create entangled photons on one chip and use them to teleport information from one chip to another by entanglement swapping. One may create quantum random numbers from a chip, which may be useful for e.g. encryption, or multiplex streams of quantum data signals through a photonic chip. Photonic integrated chips can be used to create very high dimensional quantum entanglement, and to perform quantum simulations or potentially general purpose quantum computing. At the SPOC Centre (Silicon Photonics for Optical Communications) we are working with optical chips and investigating what they may be used for, both for classical systems and for quantum applications. In this talk, I will introduce some of our results on generating interesting photonic quantum states and their usage for quantum communications and simulations.