Researchers created a new particle called Tauonium.

"Tauonium: The Smallest and Heaviest Atom with Pure Electromagnetic Interaction. Credit: ©Science China Press" (ScitechDaily, Beyond Hydrogen: Discovery of Tiny New Atom Tauonium With Massive Implications)

"The hydrogen atom was once considered the simplest atom in nature, composed of a structureless electron and a structured proton. However, as research progressed, scientists discovered a simpler type of atom, consisting of structureless electrons (e-), muons (μ-), or tauons (τ-) and their equally structureless antiparticles. These atoms are bound together solely by electromagnetic interactions, with simpler structures than hydrogen atoms, providing a new perspective on scientific problems such as quantum mechanics, fundamental symmetry, and gravity." (ScitechDaily, Beyond Hydrogen: Discovery of Tiny New Atom Tauonium With Massive Implications)

Tauonium is combination of tau particle and its antiparticle. So, it's very similar to positronium. Positronium is the combination of an electron and its antiparticle pair positron. There is also muon and its antiparticle pair, that can create this kind of combination. Those particles and their antiparticle pairs are things that can make elements that are simpler than hydrogen. 

Those particle-antiparticle combinations are called electromagnetic atoms. The particle and antiparticle orbit each other. And that centripetal force keeps those things away from each other. The problem with electromagnetic atoms is that the particle and its antiparticle pair pull each other together. 

And that thing causes annihilation. That means the energy level of the accelerator must be precise right, or the particle and its antiparticle will impact. Then the system must put that particle-antiparticle pair orbit each other at the precise right moment. That thing can made using laser light. 

In some models, the electron and its antiparticle combinations are tools, that can use as superposition and entanglement in quantum computers. The idea is that the system locks the electron and positron in the right position using laser rays. The system drives information to the electron. And then that information travels into the positron.  Or oppositely. The system could be safe because the antimatter explosion will destroy all information from the quantum entanglement. 

https://scitechdaily.com/beyond-hydrogen-discovery-of-tiny-new-atom-tauonium-with-massive-implications/