Molecules in a Trap: How to Build the Perfect Array express

Original: "Low-entropy arrays of microwave-shielded molecules prepared by interaction blockade"

arXiv:2603.00400 · 2026-02-28 · CC BY 4.0 · 1 min

Quantum Physics Quantum Gases Atomic Physics Chemical Physics

Scientists have proposed a way to reliably place ultracold molecules into individual cells, like eggs in a carton.

Ultracold molecules are a promising material for quantum computing, but assembling them into a neat array, like eggs in a carton, is no easy feat. A method has been proposed to load molecules one by one into optical tweezers or lattices directly from a gas. The molecules immediately end up in the calmest state of motion.

The secret lies in the strong repulsion between molecules shielded by microwaves. Thanks to this, two molecules cannot end up in the same trap — the spot is taken, and the second one cannot squeeze in. The success probability exceeds 99% for small traps and polar molecules.

The method can be scaled up to thousands of traps, limited only by the number of molecules in the reservoir.

This approach opens the door to large ordered arrays of polar molecules for quantum computing, simulation, and ultra-precise measurements.

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Polar molecules, like tiny magnets, interact strongly with each other: this both prevents them from sharing a trap and helps in quantum tasks.

Scientists

Erwin Schrödinger Hugh Everett III David Deutsch John Stewart Bell Louis de Broglie Lov Grover

Concepts

laser trapping optical tweezers optical trap magnetic trap laser cooling atomic cloud molecule microchip quantum control magnetic traps ice grain molecular formation ultracold atoms photomultiplier tube cryostat microelectrode array magneto optical trap ion trap ultrathin film logical qubit absolute zero

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Molecules in a Trap: How to Build the Perfect Array express