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Quantum computing. Defining and detecting quantum speedup.

Troels F Rønnow1, Zhihui Wang2, Joshua Job3

  • 1Theoretische Physik, ETH (Eidgenössische Technische Hochschule) Zurich, 8093 Zurich, Switzerland.

Science (New York, N.Y.)
|July 26, 2014
PubMed
Summary
This summary is machine-generated.

Researchers explored how to measure quantum speedup in small quantum devices. Testing a D-Wave Two device with 503 qubits found no clear quantum speedup for random spin glass problems.

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Area of Science:

  • Quantum computing
  • Computational complexity theory

Background:

  • Assessing quantum speedup is crucial for evaluating quantum hardware.
  • Small-scale quantum devices present unique challenges for performance measurement.

Purpose of the Study:

  • To define and measure quantum speedup rigorously.
  • To identify and avoid common pitfalls in speedup assessment.
  • To empirically test these methods on a D-Wave Two quantum annealer.

Main Methods:

  • Development of a framework for defining and measuring quantum speedup.
  • Utilizing random spin glass instances as a benchmark problem.
  • Testing on a D-Wave Two device with up to 503 qubits.

Main Results:

  • No evidence of quantum speedup was found when analyzing the entire dataset.
  • Inconclusive results were obtained when comparing subsets of instances individually.
  • The study highlights the subtle nature of detecting quantum speedup.

Conclusions:

  • Current methods and benchmarks may not reveal quantum speedup for all problem types.
  • Careful consideration of data analysis is essential to avoid misinterpreting results.
  • Further research is needed to explore quantum speedup on diverse problem classes.