US 12,033,034 B2
Entangled state preparation method and device based on superconducting quantum bit and Rydberg atom
Jianhao Yuan, Guangdong (CN); Dejian Pan, Guangdong (CN); Qinzhou Ye, Guangdong (CN); Zhentao Liang, Guangdong (CN); and Hui Yan, Guangdong (CN)
Assigned to South China Normal University, Guangzhou (CN)
Appl. No. 17/611,127
Filed by South China Normal University, Guangdong (CN)
PCT Filed Mar. 16, 2021, PCT No. PCT/CN2021/080997
§ 371(c)(1), (2) Date Nov. 12, 2021,
PCT Pub. No. WO2021/190349, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 202011157980.8 (CN), filed on Oct. 26, 2020.
Prior Publication US 2022/0222565 A1, Jul. 14, 2022
Int. Cl. G06N 10/40 (2022.01); G06N 10/20 (2022.01)
CPC G06N 10/40 (2022.01) [G06N 10/20 (2022.01)] 10 Claims
OG exemplary drawing
 
1. An entangled state preparation method based on a superconducting quantum bit and a Rydberg atom, wherein it comprises the following steps:
resonantly coupling the superconducting quantum bit with a selected mode of a superconducting transmission line cavity, at the same time, resonantly coupling two Rydberg states of the Rydberg atom with a superconducting planar waveguide cavity/superconducting planar LC resonant cavity, and resonantly coupling the superconducting planar waveguide cavity/superconducting planar LC resonant cavity with the selected mode of the superconducting transmission line cavity;
adjusting the coupling strength g1 of the superconducting quantum bit and superconducting transmission line cavity, and the coupling strength g2 of the Rydberg atom and the superconducting planar waveguide cavity/superconducting planar LC resonant cavity, so that they satisfy a relationship of J=2√g1g2 with the coupling strength J between the superconducting transmission line cavity and the superconducting planar waveguide cavity/superconducting planar LC resonant cavity;
with the help of two strong microwave driving fields, achieving an unconventional geometric quantum gate, so that the effective coupling between the quantum bits is generated; and
selecting a specific time so that a time evolution operator of the Rydberg atom and the superconducting bit state transmission is insensitive to a thermal state, and completing the preparation of a maximum entangled state.