US 12,248,851 B1
Thermalization and attenuation of signals within quantum computing systems via directional couplers
Daniel Sank, Goleta, CA (US); and Evan Robert Jeffrey, Santa Barbara, CA (US)
Assigned to GOOGLE LLC, Mountain View, CA (US)
Filed by Google LLC, Mountain View, CA (US)
Filed on Aug. 16, 2023, as Appl. No. 18/450,996.
Int. Cl. G06N 10/40 (2022.01)
CPC G06N 10/40 (2022.01) 20 Claims
OG exemplary drawing
 
1. A quantum computing system (QCS) comprising:
a cryogenic sub-system, wherein a first environment is outside the cryogenic sub-system and a second environment is associated with the cryogenic sub-system;
a signal-generating element, positioned in the first environment, that generates a first signal;
a first signal-splitting element positioned within the second environment;
a first transmission path that electromagnetically (EM) couples the signal-generating element and the first signal-splitting element such that the first transmission path transmits the first signal from the signal-generating element to the first signal-splitting element and the first signal-splitting element subdivides the first signal into a second signal and a third signal;
a third transmission path that EM couples the first environment and the first signal-splitting element such that the third transmission path transmits the third signal from the first signal-splitting element to the first environment;
a quantum device positioned within the cryogenic sub-system; and
a second transmission path that at least partially EM couples the first signal-splitting element and the quantum device such that the second transmission path transmits the second signal away from the first signal-splitting element and at least partially provides at least a portion of the second signal to the quantum device.