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- W2945470512 abstract "Experimentally realizable quantum computers are rapidly approaching the threshold of quantum supremacy. Quantum Hamiltonian simulation promises to be one of the first practical applications for which such a device could demonstrate an advantage over all classical systems. However, these early devices will inevitably remain both noisy and small, precluding the use of quantum error correction. We use high-performance classical tools to construct, optimize, and simulate quantum circuits subject to realistic error models in order to empirically determine the simulation capacity of near-term simulation experiments implemented via quantum signal processing (QSP), describing the relationship between simulation time, system size, and resolution of QSP circuits which are optimally configured to balance algorithmic precision and external noise. From simulation capacity models, we estimate maximum tolerable error rate for meaningful simulation experiments on a near-term quantum computer. By exploiting symmetry inherent to the QSP circuit, we further demonstrate that its capacity for quantum simulation can be increased by at least two orders of magnitude if errors are systematic and unitary. We find that a device with $epsilon^2=10^{-5}$ systematic amplitude errors could meaningfully simulate systems up to $napprox16$ with an expected failure rate below $10%$, whereas the largest system a device with a stochastic error rate of $p_epsilon=10^{-5}$ could meaningfully simulate with the same rate of failure is between $n=3$ and $n=5$ (depending on the stochastic channel). Extrapolating from empirical results, we estimate that one would typically need a stochastic error rate below $p_epsilon=10^{-8}$ to perform a meaningful $n=50$ simulation experiment with a failure rate below $10%$, while the same experiment could tolerate systematic unitary errors with strength $epsilon^2approx10^{-6}$." @default.
- W2945470512 created "2019-05-29" @default.
- W2945470512 creator A5024823796 @default.
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- W2945470512 date "2019-05-26" @default.
- W2945470512 modified "2023-09-25" @default.
- W2945470512 title "Empirical determination of the simulation capacity of a near-term quantum computer" @default.
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- W2945470512 doi "https://doi.org/10.48550/arxiv.1905.10724" @default.
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