Photonic quantum technology

Quantum information technology utilises quantum phenomena to create novel methods in computation, communication, metrology, and so on. This project aims to develop quantum information technologies using quantum optics, including quantum-enhanced adaptive measurements, implementation of quantum Non-Gaussian state/operation, quantum communication, characterization of quantum measurements, etc. This project is funded by the ARC Centre of Excellence for Quantum Computation & Communication Technology. The recent results include a development of time & frequency quantum teleportation using frequency multiplexed entanglement (H. Song, H. Yonezawa, K. B. Kuntz, M. Heurs, E. H. Huntington, Phys. Rev. A 90, 042337 (2014)). The proposed method, where we use a single frequency-multiplexed entangled beam to realise an arbitrary number of sequential teleportation, will contribute the future frequency-multiplexed communication network or computation which is based on teleportation technologies. We also demonstrate experimental implementation of a dynamical quadratic quantum gate (K. Miyata, H. Ogawa, P. Marek, R. Filip, H. Yonezawa, J. Yoshikawa, and A. Furusawa, Phys. Rev. A 90, 060302(R) (2014)). This is a crucial step to the quantum Non-Gaussian gate which is a key gate to develop an arbitrary quantum gate in continuous variable quantum computation. This work was done in collaboration with University of Tokyo.