Superconducting quantum circuit of NOR in quantum annealing

被引:5
|
作者
Saida, Daisuke [1 ,2 ]
Hidaka, Mutsuo [1 ]
Miyake, Kouhei [3 ]
Imafuku, Kentaro [1 ]
Yamanashi, Yuki [3 ]
机构
[1] Natl Inst Adv Ind Sci & Technol, Device Technol Res Inst, Cent 2,1-1-1 Umezono, Tsukuba, Ibaraki 3058568, Japan
[2] Fujitsu Res, Quantum Lab, Nakahara Ku, 1-1 Kamikodanaka,4 Chome, Kawasaki, Kanagawa 2118588, Japan
[3] Yokohama Natl Univ, Sch Engn Sci, 79-5 Tokiwadai, Yokohama, Kanagawa 2408501, Japan
关键词
D O I
10.1038/s41598-022-20172-0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The applicability of quantum annealing to various problems can be improved by expressing the Hamiltonian using a circuit satisfiability problem. We investigate the detailed characteristics of the NOR/ NAND functions of a superconducting quantum circuit, which are the basic building blocks to implementing various types of problem Hamiltonians. The circuit is composed of superconducting flux qubits with all-to-all connectivity, where direct magnetic couplers are utilized instead of the variable couplers in the conventional superconducting quantum circuit. This configuration provides efficient scalability because the problem Hamiltonian is implemented using fewer qubits. We present an experiment with a complete logic operation of NOR/NAND, in which the circuit produces results with a high probability of success for arbitrary combinations of inputs. The features of the quantum circuit agree qualitatively with the theory, especially the mechanism for an operation under external flux modulation. Moreover, by calibrating the bias conditions to compensate for the offset flux from the surrounding circuit, the quantum circuit quantitatively agrees with the theory. To achieve true quantum annealing, we discuss the effects of the reduction in electric noise in quantum annealing.
引用
收藏
页数:7
相关论文
empty
未找到相关数据