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Complete scheme to “teleport” quantum information by photons

Breakthrough toward quantum communication and computers

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Graduate School of Engineering / Faculty of Engineering
2013/08/29

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”.

© Shuntaro Takeda, An image of the experiment.
Particles of light with the information of quantum bits are sequentially sent to the sender (left) of quantum teleportation, and then transferred to the receiver (right) with high efficiency.

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.

Press release

Paper

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.
Article link

Links

Graduate School of Engineering

Department of Applied Physics, Graduate School of Engineering

Furusawa Laboratory, Department of applied physics, Graduate School of Engineering

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