Superconducting Qubit Based on Twisted Cuprate Van der Waals Heterostructures

Valentina Brosco; Giuseppe Serpico; Valerii Vinokur; Nicola Poccia; Uri Vool

doi:10.1103/PhysRevLett.132.017003

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Superconducting Qubit Based on Twisted Cuprate Van der Waals Heterostructures

Valentina Brosco, Giuseppe Serpico, Valerii Vinokur, Nicola Poccia, Uri Vool

DOI 10.1103/PhysRevLett.132.017003 · Physical Review Letters

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Abstract

Van-der-Waals assembly enables the fabrication of novel Josephson junctions featuring an atomically sharp interface between two exfoliated and relatively twisted Bi2Sr2CaCu2O8+x (Bi2212) flakes. In a range of twist angles around 45°, the junction provides a regime where the interlayer two-Cooper pair tunneling dominates the current-phase relation. Here we propose employing this novel junction to realize a capacitively shunted qubit that we call flowermon. The d-wave nature of the order parameter endows the flowermon with inherent protection against charge-noise-induced relaxation and quasiparticle-induced dissipation. This inherently protected qubit paves the way to a new class of high-coherence hybrid superconducting quantum devices based on unconventional superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown