You are here
Wednesday, May 9, 2018 - 11:15 to 12:30 Auditorium
In this talk, we will present the basic concept, operational principle and experimental perfor-mance of a novel computing machine based on the network of degenerate optical parametric oscillators. The developed machine has 2048 qubits with all-to-all connections and is now available as a cloud system via internet. There are at least three quantum computing models proposed today: they are unitary quan-tum computation, adiabatic quantum computation and dissipative quantum computation. A gate model quantum computer implements the unitary quantum computation model and is expected to solve particular problems with hidden periodicity or specific structure [1,2], while a coherent Ising machine (CIM), implements the dissipative quantum computation model [3,4] and is expected to solve unstructured combinatorial optimization problems. We will dis-cuss the two types of CIMs, optical delay line coupling machine  and measurement feed-back coupling machine , as well as the performance comparison against modern digital computers and algorithms . References  D. Deutsch, Proc. of the Royal Society of London. Series A, Mathematical and Physical Sciences, 400, 97–117 (1985); D. Deutsch and R. Jozsa, Proc. Roy. Soc. (London) A 439, 553-558 (1992).  P. W. Shor, Proc. of the 35th Annual Symposium on Foundations of Computer Science, IEEE Computer Socie-ty Press,124-134 (1994).  W. H. Zurek, Rev. Mod. Phys. 75, 715-775 (2003).  F. Verstraete, M. M. Wolf, and J. I. Cirac, Nature Phys. 5, 633-636 (2009).  A. Marandi Z. Wang, K. Takata, R. L. Byer, and Y. Yamamoto, Nature Photonics 8, 937-942 (2014); T. Inagaki, K. Inaba, R. Hamerly, K. Inoue, Y. Yamamoto, and H. Takesue, Nature Photonics 10, 415-419 (2016).  T. Inagaki, Y. Haribara, K. Igarashi, T. Sonobe, S. Tamate, T. Honjo, A. Marandi, P. L. McMahon, T. Umeki, K. Enbutsu, O. Tadanaga, H. Takenouchi, K. Aihara, K. Kawarabayashi, K. Inoue, S. Utsunomiya, and H. Takesue, Science 354, 603-606 (2016); P. L. McMahon, A. Marandi, Y. Haribara, R. Hamerly, C. Langrock, S. Tamate, T. Inagaki, H. Takesue, S. Utsunomiya, K. Aihara, R. L. Byer, M. M. Fejer, H. Mabuchi, and Y. Yamamoto, Science 354, 614-617 (2016).  Y. Haribara, H. Ishikawa, S. Utsunomiya, K. Aihara, and Y. Yamamoto, Quantum Sci. Tech. 2, 044002 (2017).