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October 27, 2021

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China in quantum leap with computer

Chinese scientists have established a quantum computer prototype named “Jiuzhang 2.0” with 113 detected photons, achieving major breakthroughs in quantum computational speedup.

In the study, Gaussian boson sampling, a classical simulation algorithm, was used to provide a highly efficient way of demonstrating quantum computational speedup in solving some well-defined tasks.

With 113 detected photons, “Jiuzhang 2.0” can implement large-scale GBS septillion times faster than the world’s fastest existing supercomputer and 10 billion times faster than its earlier version, “Jiuzhang.”

In short, it would take the fastest supercomputer about 30 trillion years to solve a problem that “Jiuzhang 2.0” can solve in just 1 millisecond.

The study, led by renowned quantum physicist Pan Jianwei, was published online in the journal Physical Review Letters on Monday.

Inspired by the concept of light amplification by stimulated emission of radiation, or LASER, the team developed a stimulated squeezed light source with high brightness and simultaneously near-unity purity and efficiency for scalable GBS.

In December 2020, the researchers established the quantum computer prototype “Jiuzhang” through which up to 76 photons were detected, achieving quantum computational advantage.

Its quantum computing system can implement large-scale GBS 100 trillion times faster than the world’s fastest existing supercomputer.


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