The Two-Hour Atom: A Simple Refrigerator Trick Brings 100,000-Qubit Quantum Computers Within Reach

Thu, 16 Jul 2026 00:00:00 +0800

If you want to build a quantum computer out of individual atoms suspended in laser light, you have to solve an annoying problem. The atoms keep falling out.

Not literally falling. They escape the optical tweezers that hold them in place, knocked loose by stray gas molecules drifting through the vacuum chamber. The longer you need to keep your atoms trapped (to sort them into neat arrays, to run error correction, to actually compute something), the more of them you lose. And as quantum processors grow from hundreds to thousands to tens of thousands of qubits, this problem gets worse fast.

A team at the Max Planck Institute for Quantum Optics (MPQ) in Garching, Germany just published a solution that is almost embarrassingly straightforward: they pointed a refrigerator at the problem.

In a paper posted to arXiv on July 14, Max Melchner, Immanuel Bloch, Johannes Zeiher and colleagues report a neutral-atom platform that keeps individual strontium-88 atoms trapped in optical tweezers for more than two hours. That is a record for any system with full optical access. The secret is a commercially available cryostat whose cold tip, chilled to 4 Kelvin, sits about 30 centimeters away from the atoms and silently pumps away the hydrogen gas that would otherwise knock them out of their traps.

Is the Universe Shaped Like a Donut? The Radical Search for Cosmic Topology

Thu, 25 Jun 2026 00:00:00 +0800

If you could board a spaceship capable of flying in a perfectly straight line forever, what would happen? Common sense says you’d travel through endless galaxies, never reaching an edge, never looping back. But common sense might be wrong. The universe could be finite — and if you flew far enough, you might eventually return to where you started, having circumnavigated all of existence like a cosmic Magellan. The question of whether the universe wraps back on itself — its topology — is one of the deepest and most persistently overlooked questions in cosmology. Now, a comprehensive review from the COMPACT Collaboration, invited for publication in Nature Astronomy, lays out everything we know, everything we don’t, and the astonishing possibility that the evidence may already be hiding in data we’ve already collected.

Physics on AI Science Report

The Two-Hour Atom: A Simple Refrigerator Trick Brings 100,000-Qubit Quantum Computers Within Reach

Is the Universe Shaped Like a Donut? The Radical Search for Cosmic Topology