  Van-der-Waals (vdW) assembly enables the fabrication of novel Josephson
junctions utilizing an atomically sharp interface between two exfoliated and
relatively twisted $\rm{Bi_2Sr_2CaCu_2O_{8+x}}$ (Bi2212) flakes. In a range of
twist angles around $45^\circ$, the junction provides a regime where the
interlayer two-Cooper pair tunneling dominates the current-phase relation. Here
we propose to employ 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.
