Quantum Campus shares the latest in quantum science and technology. Read by more than 2,100 researchers, we publish on Fridays and are always looking for news from across the country. Want to see your work featured? Submit your ideas to the editor.

Having demonstrated a new way of trapping neutral atoms for qubits using optical cavity rather than the traditional lasers earlier in the year, a Stanford team have developed an array of 600 optical cavities that can be coupled to a 2D array of 600 atoms. The team identified techniques to overcome optical aberrations, field of view constraints, losses from optical elements, and other challenges with the approach and also proposed a path toward operating with tens of thousands of atoms.

This work was published in Physical Review X and the initial work appeared in Nature.

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New Scientist reported that Quantinuum has produced qubits capable of making as few as five errors for every million times the qubits were used to store information. When completing simple mathematical operations, the qubits showed about seven errors in 100,000 uses. Further, the team showed that the error rate decreased when more physical qubits were added. The runs were completed on the Helios-1 system and represent a significant improvement in error rates.

Quantinuum’s David Hayes told the publication that the company was improving its error correction by adjusting energy shifts in the qubits using a laser and by applying a color code correction scheme in their software.

Read the full article in New Scientist.

A team at Columbia observed a bound state in the continuum in a metal for the first time. They used scanning tunneling microscopy to identify two defect-induced electronic states that remain localized in a two-dimensional van der Waals metal.

“Quantum mechanics predicts that an electron wave can, theoretically, remain trapped even when there are infinitely many paths for it to escape. This effect is known from light waves, but it has never been seen before for electrons,” said Columbia’s Raquel Queiroz.

This work was published in Science.

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