US 12,267,042 B2
Oscillation apparatus, quantum computer, and control method
Tsuyoshi Yamamoto, Tokyo (JP); and Yoshihito Hashimoto, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 17/625,413
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Jun. 26, 2020, PCT No. PCT/JP2020/025244
§ 371(c)(1), (2) Date Jan. 7, 2022,
PCT Pub. No. WO2021/014887, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 2019-133816 (JP), filed on Jul. 19, 2019.
Prior Publication US 2022/0263467 A1, Aug. 18, 2022
Int. Cl. H03B 15/00 (2006.01); G01C 19/56 (2012.01); G01C 19/5607 (2012.01); G01C 19/5642 (2012.01); G01C 19/5649 (2012.01); G01C 19/5719 (2012.01); G06N 10/40 (2022.01); H10N 60/10 (2023.01)
CPC H03B 15/003 (2013.01) [G01C 19/56 (2013.01); G01C 19/5607 (2013.01); G01C 19/5642 (2013.01); G01C 19/5649 (2013.01); G01C 19/5719 (2013.01); G06N 10/40 (2022.01); H10N 60/10 (2023.02)] 17 Claims
OG exemplary drawing
 
1. An oscillation apparatus comprising:
an oscillator comprising a resonator and a magnetic-field generating circuit, the resonator comprising a loop circuit and a capacitor, the loop circuit comprising a first superconducting line, a first Josephson junction, a second superconducting line, and a second Josephson junction connected in a ring shape, the magnetic-field generating circuit being configured to apply a magnetic field to the loop circuit, and the oscillator being configured to perform parametric oscillation;
a read-out circuit for reading out an internal state of the oscillator; and
a circuit component in which a coupling strength between the oscillator and the read-out circuit is variable, wherein
the resonator is connected to the read-out circuit through the circuit component, and the circuit component is:
a variable filter of which a bandwidth in which transmission of a signal is restricted is variable, or
a variable capacitor having a variable capacitance.