Entangled circuits maintained fidelity for ten hours.

Researchers at Harvard University achieved 99.941(3)% fidelity in entangling CZ gates using a neutral atom quantum processor, a result enabled by a technique. This performance, detailed in a new paper, represents stable operation for ten hours and builds on a raw fidelity of 99.854(4)%. The team then used these low-error gates to both create and disentangle cluster states, demonstrating control that is important for complex quantum algorithms and ultimately enabling efficient fault-tolerant quantum computation. Employing a technique called loss postselection, scientists achieved 99.941(3)% fidelity in entangling CZ gates, a substantial improvement over the 99.854(4)% fidelity attained without the method and demonstrating a potential…