Surpassing the resistance quantum with a geometric superinductor

Magnifying quantum phase fluctuations with Cooper-pair pairing

“…The latter condition corresponds to a linear circuit with characteristic impedance far exceeding the superconducting resistance quantum, which constitutes a formidable challenge. Initial progress was made using the advent of the superinductance [14], now realized in various materials [15][16][17]. However, surpassing this threshold by two orders of magnitude has only recently been achieved in a feat of nanofabrication, where Josephson junction arrays were suspended in vacuum [4].…”