Patent ID: 11871682
Assignee: NEC CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 3:
4. A quantum device comprising:
an interposer;
a quantum chip;
a first connection part that is provided between the interposer and the quantum chip and electrically connects a wiring layer of the interposer to a wiring layer of the quantum chip; and
a second connection part that is provided on a main surface of the interposer where the first connection part is arranged and is connected to a cooling plate, wherein
the second connection part as well as the first connection part is connected to a ground electrode of the quantum chip,
the first connection part comprises:
a plurality of pillars provided on the main surface of the interposer; and
a first metal film that is provided on a surface of the plurality of pillars and is formed of a superconducting material, and

the second connection part comprises:
a plurality of dummy pillars provided on the main surface of the interposer along with the plurality of pillars; and
a second metal film provided on a surface of the plurality of dummy pillars so as to be continuous from a surface of the plurality of pillars.