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2 results

  • 9 - Device Characterization

  • Asma Al-Qasimi, University of Rochester, New York, Daniel F. V. James, University of Toronto
  • Book:
    Quantum Information
    Published online:
    17 October 2025
    Print publication:
    26 June 2025, pp 177-192

  • Summary

    Deducing the quantum state of your device is essential for diagnosing and perfecting it, and the methods needed for this are introduced in this chapter. We also extend the discussion to methods used to validate noisy, intermediate-scale quantum computers when they grow too large for tomography to be used.

  • 7 - Benchmarking

  • Shayan Majidy, Harvard University, Massachusetts, Christopher Wilson, University of Waterloo, Ontario, Raymond Laflamme, University of Waterloo, Ontario
  • Book:
    Building Quantum Computers
    Published online:
    29 November 2024
    Print publication:
    11 July 2024, pp 219-232

  • Summary

    The final chapter details some methods for evaluating the performance of quantum computers. It begins by delineating the essential features of quantum benchmarks and organizes them into a three-tiered framework. Initially, it discusses early-stage benchmarks that provide a detailed analysis of basic operations on a few qubits, emphasizing fidelity tests and tomography. Then, it progresses to intermediate-stage benchmarks that provide a more generalized appraisal of gate quality, circuit depth, and length. Concluding the benchmarking spectrum, later-stage benchmarks are introduced, aimed at evaluating the overall reliability and efficiency of quantum computers operating with a large number of qubits (e.g. 1000 or more).