Communications of the ACM
Quantum Supremacy Achieved by More Complex Quantum Computer
Google's Sycamore processor simulated a quantum circuit and sampled random numbers from its output, a task that has become a benchmark for the current generation of quantum computers.
Credit: Peter Kneffel/dpa/Alamy Live News
A quantum computer has solved a calculation in 4.2 hours that would take a classical system thousands of years, in a demonstration of what its Chinese developers call "quantum computational advantage."
The Zuchongzhi 2.1 processor developed by the University of Science and Technology of China research team accomplished this with 60 quantum bits (qubits)—six more than the 54-qubit Sycamore processor Google used to demonstrate quantum supremacy in 2019.
The researchers say Zuchongzhi 2.1 is less "noisy" and more reliable than its 56-qubit Zuchongzhi predecessor, and performed a calculation that is three orders of magnitude harder than their previous experiment.
Imperial College London's Peter Knight said, "With the chip they've got they've made really impressive strides, but it's probably about to saturate. They've probably used up all the capability of the device they've got at the moment."
From New Scientist
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