[1] Beijing Computat Sci Res Ctr, Beijing 100193, Peoples R China
[2] Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada
[3] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada
[4] Univ Guelph, Dept Math & Stat, Guelph, ON N1G 2W1, Canada