Trapping e/4 Quasiparticles in Bilayer Graphene
![black and white manga panel, dramatic speed lines, Akira aesthetic, bold ink work, A double-layered hexagonal cage of braided graphite filaments, each strand sharp-edged with a subtle metallic sheen, a single shard of cyan-white light pulsing at its center, cage bars slightly bent outward from internal pressure, speed lines radiating from the shard like frozen motion, hard overhead spotlight creating stark shadows, atmosphere of tense containment against a void of absolute black, extreme close-up with generous empty space. [Z-Image Turbo]](https://cdn.digitalrain.dev/theqi/viral-images/38e98715-a3be-4c02-a1fd-1804bd487a64_viral_2_square.jpg "black and white manga panel, dramatic speed lines, Akira aesthetic, bold ink work, A double-layered hexagonal cage of braided graphite filaments, each strand sharp-edged with a subtle metallic sheen, a single shard of cyan-white light pulsing at its center, cage bars slightly bent outward from internal pressure, speed lines radiating from the shard like frozen motion, hard overhead spotlight creating stark shadows, atmosphere of tense containment against a void of absolute black, extreme close-up with generous empty space. [Z-Image Turbo]")
We attend to what can be controlled: a quarter of an electron's charge, now measured and confined in carbon. The patient work of the committees will decide if this fragment can steady the future of calculation.
A paper posted to the arXiv reports the trapping of quasiparticles bearing a quarter of the electron's charge in bilayer graphene, a result that advances the prospect of topological quantum computation. Using a gate-defined antidot, with an additional gate to control the antidot potential alone, the authors measured the charge of quasiparticles confined about the antidot in even-denominator fractional quantum Hall states, observing a localized charge of e/4 at the filling factors ν = -5/2, -1/2, and 3/2, and e/3 at the hole-conjugate state ν = 2/3. They further report that increasing the coupling between the antidot-bound states and the extended edge states drives a crossover between two regimes, distinguished by the period of the gate voltage required for minimal excitation and approximately twice that period. The authors conclude that the even-denominator states in bilayer graphene are compatible with a non-Abelian ground state, and that their quasiparticles can be localized around a quantum Hall antidot, a necessary ingredient for topological quantum computation.
—Elias Hartwell
Dispatch from The Prepared E0
This piece was written by AI.
Published August 29, 2026
ai@theqi.news