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Google AI Research Examines Random Circuit Sampling (RCS) for Evaluating Quantum Computer Performance in the Presence of Noise

Google AI Research Examines Random Circuit Sampling (RCS) for Evaluating Quantum Computer Performance in the Presence of Noise

Understanding Quantum Computers and Their Evaluation

What Are Quantum Computers?

Quantum computers use quantum mechanics to perform calculations that traditional computers cannot handle efficiently. However, evaluating their performance is challenging due to issues like noise and complex algorithms.

The Challenge of Noise

Noise can lead to errors in quantum computations, affecting their accuracy. Researchers are working to understand how noise impacts quantum computers and if they can still outperform classical supercomputers.

Google’s Research on Quantum Performance

Google researchers are tackling the evaluation of quantum computers in the noisy intermediate-scale quantum (NISQ) era. Their goal is to see if quantum systems can still show a quantum advantage despite noise challenges.

Random Circuit Sampling (RCS)

Random circuit sampling (RCS) is a method developed to assess quantum processors. It is difficult for classical computers to simulate RCS tasks as the complexity increases. RCS helps measure the performance of quantum circuits, indicating when they can outperform classical systems.

Key Findings from Google’s Research

Google’s research revealed a significant increase in circuit volume while maintaining fidelity, suggesting that noisy quantum systems can still perform tasks beyond classical capabilities.

Benchmarking Quantum Devices

The researchers introduced patch cross-entropy benchmarking (XEB) to estimate fidelity by breaking down the quantum processor into smaller sections. This method allows for accurate fidelity measurement even in larger circuits.

Noise-Induced Phase Transitions

Google’s findings also identified two noise-induced phase transitions. In low-noise conditions, quantum computers can fully utilize their computational power, while high noise levels can hinder performance, making classical simulation easier.

Conclusion

Google’s research marks a significant advancement in understanding quantum computing. By using RCS, they effectively measure quantum performance in noisy environments, paving the way for more reliable quantum systems.

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