High-fidelity cluster state generation for ultracold atoms in an optical lattice.
We propose a method for generating high-fidelity multipartite spin entanglement of ultracold atoms in an optical lattice in a short operation time with a scalable manner, which is suitable for measurement-based quantum computation. To perform the desired operations based on the perturbative spin-spin interactions, we propose to actively utilize the extra degrees of freedom (DOFs) usually neglected in the perturbative treatment but included in the Hubbard Hamiltonian of atoms, such as, (pseudo-)charge and orbital DOFs. Our method simultaneously achieves high fidelity, short operation time, and scalability by overcoming the following fundamental problem: enhancing the interaction strength for shortening the operation time breaks the perturbative condition of the interaction and inevitably induces unwanted correlations among the spin and extra DOFs.
NTT Basic Research Laboratories, NTT Corporation, Atsugi 243-0198, Japan and JST, CREST, Chiyoda-ku, Tokyo 102-0075, Japan.
Kensuke
K
Inaba
NTT Secure Platform Laboratories, NTT Corporation, Musashino 180-8585, Japan and JST, CREST, Chiyoda-ku, Tokyo 102-0075, Japan.
Yuuki
Y
Tokunaga
NTT Basic Research Laboratories, NTT Corporation, Atsugi 243-0198, Japan and JST, CREST, Chiyoda-ku, Tokyo 102-0075, Japan.
Kiyoshi
K
Tamaki
NTT Basic Research Laboratories, NTT Corporation, Atsugi 243-0198, Japan and JST, CREST, Chiyoda-ku, Tokyo 102-0075, Japan.
Kazuhiro
K
Igeta
NTT Basic Research Laboratories, NTT Corporation, Atsugi 243-0198, Japan and JST, CREST, Chiyoda-ku, Tokyo 102-0075, Japan.
Makoto
M
Yamashita