[17a-A22-1~12] KS.2 Quantum Information Engineering Group

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[17a-A22-3] Integrated superconducting quantum circuit design in stacked substrates

〇Yutaka Tabuchi¹, Shuhei Tamate¹, Bunpei Masaoka¹, Shinichi Yorozu¹ (1.RIKEN)

Keywords:

Quantum Computer,Electronics,Superconductor

Dense integration of the superconducting circuits is promising to pave toward quantum computation with an error correction code. In this talk, we report the design of an integrated superconducting circuit in three stacked silicon substrates for further scalability of superconducting quantum computers. Substrate stacking is an attractive method for a quantum error correction code requiring a two-dimensional grid of qubits and non-local interaction between qubits. We design four layers of superconducting circuits in a stacked structure, in which we place the qubit and readout resonator in the inner layers, and the ground electrodes are the outermost layers to suppress the radiation. Through-silicon vias and the micro-bump electrodes placed between the substrates help to guide the microwave signal and locally confine the electromagnetic energy of the circuits. We will further discuss signal crosstalk and an available footprint area for scalability.