Re-examining the quantum volume test: Ideal distributions, compiler optimizations, confidence intervals, and scalable resource estimations

Charles H. Baldwin, Karl Mayer, Natalie C. Brown, Ciarán Ryan-Anderson, and David Hayes

Quantinuum, 303 S. Technology Ct, Broomfield, Colorado 80021, USA

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Abstract

The quantum volume test is a full-system benchmark for quantum computers that is sensitive to qubit number, fidelity, connectivity, and other quantities believed to be important in building useful devices. The test was designed to produce a single-number measure of a quantum computer's general capability, but a complete understanding of its limitations and operational meaning is still missing. We explore the quantum volume test to better understand its design aspects, sensitivity to errors, passing criteria, and what passing implies about a quantum computer. We elucidate some transient behaviors the test exhibits for small qubit number including the ideal measurement output distributions and the efficacy of common compiler optimizations. We then present an efficient algorithm for estimating the expected heavy output probability under different error models and compiler optimization options, which predicts performance goals for future systems. Additionally, we explore the original confidence interval construction and show that it underachieves the desired coverage level for single shot experiments and overachieves for more typical number of shots. We propose a new confidence interval construction that reaches the specified coverage for typical number of shots and is more efficient in the number of circuits needed to pass the test. We demonstrate these savings with a $QV=2^{10}$ experimental dataset collected from Quantinuum System Model H1-1. Finally, we discuss what the quantum volume test implies about a quantum computer's practical or operational abilities especially in terms of quantum error correction.

Repository of code used in simulation and analysis: https://github.com/CQCL/qvtsim

The quantum volume test is a previously proposed benchmark for quantum computers that is sensitive to qubit number and system fidelity. Quantum volume is measured by running a set of complicated random circuits on a quantum computer, measuring the outputs, and then comparing those outputs to a classical simulation. The comparison method yields a single-number measure of a quantum computer’s general capability, but a complete understanding of the tests limitations and operational meaning is still missing. We explore the quantum volume test to better understand its design aspects, sensitivity to errors, passing criteria, and what passing implies about a quantum computer.

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[24] Steven Herbert, Ifan Williams, Roland Guichard, and Darren Ng, "Noise-Aware Quantum Amplitude Estimation", arXiv:2109.04840, (2021).

[25] Elijah Pelofske, Vincent Russo, Ryan LaRose, Andrea Mari, Dan Strano, Andreas Bärtschi, Stephan Eidenbenz, and William J. Zeng, "Increasing the Measured Effective Quantum Volume with Zero Noise Extrapolation", arXiv:2306.15863, (2023).

[26] Aliza U. Siddiqui, Kaitlin Gili, and Chris Ballance, "Stressing Out Modern Quantum Hardware: Performance Evaluation and Execution Insights", arXiv:2401.13793, (2024).

[27] Tuomas Laakkonen, Konstantinos Meichanetzidis, and Bob Coecke, "Quantum Algorithms for Compositional Text Processing", arXiv:2408.06061, (2024).

[28] Elijah Pelofske, "Analysis of a Programmable Quantum Annealer as a Random Number Generator", arXiv:2307.02573, (2023).

The above citations are from Crossref's cited-by service (last updated successfully 2024-08-31 23:31:43) and SAO/NASA ADS (last updated successfully 2024-08-31 23:31:43). The list may be incomplete as not all publishers provide suitable and complete citation data.