Jonathan Matthews & Axel Kuhn

1. Centre for Quantum Photonics, University of Bristol, UK, & Clarendon Laboratory, University of Oxford, UK

1. Integrated Quantum Photonics 2. Qubits, qutrits, and ququads stored in single photons from an atom-cavity system



Talk 1: “Integrated quantum photonics"
Dr. Jonathan Matthews
Lecturer & Leverhulme Trust Early Career Fellow
Centre for Quantum Photonics, University of Bristol, UK
"Single photons are a promising platform for developing quantum technology and observing fundamental quantum physics. Much of the processing of quantum information encoded onto photons can be performed by optical components. In Bristol, we are developing the application of integrated optics to guide and manipulate single photons, to generate single photons and to develop them on an integrated quantum photonics platform. I will review some of the work conducted in this area, including realising all-linear optics quantum gates, quantum simulation of quantum walks and demonstrating the principles of quantum metrology on a chip."


Talk 2: “Qubits, qutrits, and ququads stored in single photons from an atom-cavity system"
Dr. Axel Kuhn
Reader in Atomic and Laser Physics
Clarendon Laboratory, University of Oxford, UK
"Photons acting as flying information carriers are key to many modern applications of quantum technologies, and the arbitrary control of their quantum state in space and time is crucial. Here we show how to accomplish this task in the deterministic single-photon emission from coupled atom-cavity systems. We encode arbitrary qubits, qutrits and even ququads within their spatio-temporal mode profile, with a fidelity verified in quantum-homodyne measurements better than 96%. In collaboration with our partners from Bristol, we also demonstrate the usefulness of our deterministically generated single photons for operating small linear optics quantum circuits like, e.g., a CNOT gate in the coincidence basis. We furthermore took first steps towards implementing this technique in atom-cavity arrays controlled by optical tweezers, which will open new avenues towards large-scale quantum processing."

Date: 24/3/2015
Time:12:00 (coffee & cookies will be served at 11:45)
Place:FORTH Seminar Room 1