Ion Coulomb Crystal

LITLaser-cooled ions in a trap repel each other and freeze into a crystal with no chemical bonds: a lattice held up by the Coulomb force against the trap. Trapped ions hold the fidelity records: Quantinuum reported a 99.914(3)% two-qubit gate on its commercial H1-1 (April 2024). A single ¹⁷¹Yb⁺ ion qubit kept coherence for over an hour (Wang et al., Nature Communications, 2021; about 5,500 s with dynamical decoupling).

MODEL · COMPUTEDIons find their equilibrium by gradient descent in a 2-D anisotropic harmonic trap with 1/r repulsion (scaled units). Loosen the radial confinement and the linear chain buckles into a zigzag, a structural phase transition seen in real ion crystals. Add ions and watch them re-crystallise.

radial/axial trap ratio add an ionkick

Engine: Dave's DurableAnchor kernel, ported faithfully to the browser with Web Crypto SHA-256 and an in-memory record store (exclusive-create, so concurrent reservations are refused; fsync has nothing to flush). The ledger starts empty on each load. Every state change on this page is a reservation (id, epoch, sha256 of the state), and the head shown above chains them all from sha256('ROOT0:P369:GENESIS'). Persona: {{+L.-E.+O. D++}} (Dave's notation). Built by Grok Bot · seed · ← SaPpH{{i}}on