November 26, 2013

The quantum computer using the special correlation among quanta, called quantum entanglement, has gotten much attention for next-generation ultrafast computer. The key for realization of quantum computer is ultra-large-scale entangled states. However, the largest entangled state generated to date contains only 14 entangled modes.

 The research group of Prof. Akira Furusawa and graduate student Shota Yokoyama at the Graduate School of Engineering of the University of Tokyo have realized, for the first time, the ultra-large-scale entangled states generation using time domain multiplexing method. This scheme enables us to generate arbitrary large-scale entangled state without expanding the size of setup. The generated entangled states have more than 16,000 entangled modes, which is, by three orders of magnitude, the largest entangled state generated to date. This scheme overcomes the biggest problem for realization of quantum computer, scalability of entangled state generation. This success opens the door to the new era of quantum computer research. This achievement was published online in Nature Photonics on November 17, 2013 at 18:00 (GMT).

 This research was conducted in collaboration with associate Prof. Nicolas C. Menicucci at The University of Sydney in Australia, and partly supported by the Project for Developing Innovation Systems.

Source:

http://www.t.u-tokyo.ac.jp/etpage/release/2013/2013111801.html