[18p-B5-1~15] 11.4 Analog applications and their related technologies

2:30 PM - 2:45 PM JST(5:30 AM - 5:45 AM UTC)

[18p-B5-6] Novel way of a current supply for quantum Josephson voltage standard

〇Hirotake Yamamori¹, Daiki Matsumaru¹, Michitaka Maruyama¹, Chiharu Urano¹, Nobu-hisa Kaneko¹ (1.AIST)

Keywords:

Josephson Voltage Standard,NbN

The quantum voltage standard realizes D/A conversion by many Josephson junctions in series, and the junction array is implemented by folding it many times inside the chip. The superconducting current concentrates on the inner circumference of the wiring, and the apparent critical current of the Josephson junction decreases due to the influence of the current bias. This reduces the width of the Shapiro step and reduces the margin of the D/A conversion. We propose an easy-to-implement method to prevent this current concentration.