64-qubit system paired with 40-qubit simulator to get some sort of accuracy
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The Japanese system, now deployed at the RIKEN RQC-Fujitsu Collaboration Center, features 64 superconducting qubits on an integrated chip. "Quantum simulators, which can digitally imitate quantum computation, provide a bridge toward the development of practical fault-tolerant quantum computing ," Fujitsu explained, noting a fault-tolerant system capable of generating reliable results is likely a decade or more out.
The problem, Fujitsu explained, is that noisy intermediate-scale quantum computers suffer from computational errors due to noise in the surrounding environment. Quantum simulations aren't prone to these same errors because the qubits aren’t real and are therefore immune to noise disruptions. The downside of quantum simulation is it's rather slow compared to the real thing. And also not the real thing.Which is not to say that sims and this system aren’t useful.
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