[23p-D214-1~19] 11.5 Junction and circuit fabrication process, digital applications

[23p-D214-8] Design of NbN-Based, Extremely Low-Power Single-Flux-Quantum Circuits toward Monolithic Integration with Quantum Bits

〇Toranosuke Nakayama¹, Ueda Tomoharu¹, Tanaka Masamitsu¹, Yamashita Taro¹, Fujimaki Akira¹ (1.Nagoya Univ.)

Keywords:Single flux quantum circuit, Niobium nitride

Control of qubits by means of monolithic single-flux quantum circuits has been proposed, but this requires even lower power consumption. Due to the size limitation of the Josephson junction, a low current density of the junction is required to further reduce the power consumption, which results in a trade-off with the operation speed. The aim of this work is to evaluate the possibility of operating at speeds above 4 GHz, which is required for the control of qubits, in NbN-based single-flux quantum circuits for monolithic applications with qubits.