Presentation Information
[22p-12C-18]Broadband signal transmission in stacked substrate for superconducting quantum devices
〇Yutaka Tabuchi1, Bunpei Masaoka1, Shuhei Tamate1, Shinichi Yorozu1 (1.RIKEN RQC)
Keywords:
Quantum computer,Superconducting circuits
Research on the integration of superconducting quantum computers is accelerating. We focus on an exploit of the translational symmetry in surface code and vertically transmissible I/Os in stacked substrates to reduce the number of cables. In this talk, we report the broadband transmission property of the pseudo-coaxial structure in stacked substrates. As we can arrange superconducting qubits maintaining translational symmetry, similar to the surface code, we vertically organize signal interfaces to peripheral circuits. In this structure, a broadband microwave signals are guided through a 50-Ohm coaxial cable. We arrange a pseudo-coaxial structure using spring pins as electrical contacts between the substrate and a packaging enclosure. A pseudo-coaxial structure is also organized using through-substrate vias for vertical signal propagation inside the substrates. We discuss the transmission characteristics evaluated in low temperatures.