Complete scheme to “teleport” quantum information by photons
Breakthrough toward quantum communication and computers
Graduate School of Engineering / Faculty of Engineering
The principles of quantum mechanics allow us to realize ultra-high-capacity communication and ultra-high-speed quantum computation beyond the limits of current technology. One of the most important steps toward this goal is the transfer of quantum bits (superposition of 0 and 1) carried by particles of light by what is termed “quantum teleportation”.
The research group of Prof. Akira Furusawa and graduate student Shuntaro Takeda at the Graduate School of Engineering of the University of Tokyo have realized, for the first time, the complete quantum teleportation of photonic quantum bits using an innovative scheme of combining photonic quantum bits with optical wave teleportation. This scheme overcomes the conventional need for post-teleportation measurement to judge success. The transfer efficiency has been increased by more than 100 times, and can be improved up to 100% in principle. The transfer efficiency will be boosted ten-thousand to one-million times in the case of cascading this teleportation circuit 2 or 3 times in actual quantum information processing. Thus, this work achieves a significant milestone by overcoming a long-standing problem in quantum information processing.
This research was conducted in collaboration with Prof. van Loock at Johannes Gutenberg University Mainz in Germany, and partly supported by the Project for Developing Innovation Systems.
Shuntaro Takeda, Takahiro Mizuta, Maria Fuwa, Peter van Loock & Akira Furusawa,
“Deterministic quantum teleportation of photonic quantum bits by a hybrid technique”,
Nature 500 (2013): 315-318, doi: 10.1038/nature12366.