Nonlocal games are extensions of Bell inequalities, aimed at demonstrating quantum advantage. These games are well suited for noisy quantum computers because they only require the preparation of a shallow circuit, followed by the measurement of non-commuting observable.
A team of researchers at Bar-Ilan University in Israel ran a collaborative, mathematical game on different technologies to evaluate 1) whether the systems demonstrated quantum mechanical properties and 2) how often the machines delivered the correct results. The team then compared the results to those generated by a classical computer.
Of the technologies tested, only the Quantinuum System Model H1-1, Powered by Honeywell, outperformed the classical results. Dalla Torre said classical computers return the correct answer only 87.5% of the time. The H1-1 returned the correct answer 97% of the time. (The team also tested the game on the now-retired System Model H0, which achieved 85%.)
The mathematical game the team played requires non-local correlations. In other words, it’s a collaborative game in which parts of the system can’t communicate to solve challenges or score points.
The scientists attribute the performance of the Quantinuum technology to their low level of “noise”. After seeing the initial results from the H0 system, he worked with Dalla Torre to run it again on the upgraded H1 system (still only using six qubits). (Phys.org)
The study has been published in Advanced Quantum Technologies.