Transmission line and quantum computer

A quantum computer comprising:

• a first signal processing circuit that performs signal processing in a first temperature range;
• a second signal processing circuit that is disposed separately from the first signal processing circuit and performs signal processing in a second temperature range lower than the first temperature range;
• and
• a transmission line that transmits and receives a signal between the first signal processing circuit and the second signal processing circuit,
• the transmission line comprising:
• a first conductor layer extending in a first direction;
• a second conductor layer disposed on a side of a first surface of the first conductor layer via a first dielectric layer, the second conductor layer extending in the first direction;
• and
• a third conductor layer disposed on a side of a second surface of the first conductor layer opposite to the first surface, via a second dielectric layer, the third conductor layer extending in the first direction, wherein
• a width, in a second direction intersecting the first direction, of each of the second conductor layer and the third conductor layer is different at a plurality of locations in the first direction, and
• the first conductor layer, the second conductor layer, and the third conductor layer at least partially overlap each other in a plan view from a normal direction of the first surface.