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Ramin Ayanzadeh1, John Dorband2, Milton Halem2

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We introduce multi-qubit correction (MQC), a new quantum annealing postprocessing technique. MQC improves results by identifying and correcting excited states to find lower energy values, enhancing reproducibility.

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Area of Science:

  • Quantum Computing
  • Quantum Annealing
  • Computational Physics

Background:

  • Quantum annealers are susceptible to excited states, hindering accurate ground state approximation.
  • Existing postprocessing methods like spin-reversal transforms offer limited improvements.

Purpose of the Study:

  • To introduce multi-qubit correction (MQC) as a novel postprocessing technique for quantum annealers.
  • To demonstrate MQC's ability to reduce excited states to lower energy synthetic states.
  • To evaluate MQC's performance against current quantum annealing advancements.

Main Methods:

  • MQC treats open-system evolution as a Gibbs sampler.
  • It identifies 'virtual tunnels' between excited states.
  • MQC iteratively converges to lower energy states.

Main Results:

  • MQC significantly reduces energy values of sampled states.
  • The method enhances the reproducibility of quantum annealing results.
  • MQC outperforms existing techniques like spin-reversal transforms and increased inter-sample delay.

Conclusions:

  • MQC is an effective postprocessing strategy for quantum annealers.
  • The technique offers a pathway to more accurate ground state approximations.
  • MQC represents a notable advancement in quantum annealing software and hardware.