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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Reference-State Error Mitigation: A Strategy for High Accuracy Quantum Computation of Chemistry.

Phalgun Lolur1, Mårten Skogh1,2, Werner Dobrautz1

  • 1Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.

Journal of Chemical Theory and Computation
|January 27, 2023
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Summary

Reference-state error mitigation (REM) enhances quantum chemistry computations. This method improves accuracy on current quantum hardware with minimal overhead, advancing quantum computing applications.

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Area of Science:

  • Quantum Computing
  • Quantum Chemistry
  • Computational Science

Background:

  • Quantum computer performance is limited by decoherence and gate errors.
  • Accurate quantum chemistry simulations are crucial for scientific discovery.
  • Existing error mitigation techniques have limitations in implementation and overhead.

Purpose of the Study:

  • To introduce a novel error mitigation strategy for quantum chemistry.
  • To develop a method (Reference-State Error Mitigation - REM) applicable to current and near-term quantum devices.
  • To improve the accuracy of quantum computations for molecular systems.

Main Methods:

  • Developed and implemented Reference-State Error Mitigation (REM).
  • Applied REM alongside existing mitigation procedures.
  • Utilized the variational quantum eigensolver (VQE) framework.
  • Tested on superconducting quantum hardware and noisy circuit simulations.

Main Results:

  • Achieved up to two orders-of-magnitude improvement in ground state energy accuracy for small molecules (H2, HeH+, LiH).
  • Demonstrated REM's compatibility with existing mitigation techniques.
  • Showcased minimal postprocessing and measurement requirements for REM.
  • Validated scalability through simulations of deep quantum circuits (>1000 two-qubit gates).

Conclusions:

  • REM is a practical and effective strategy for mitigating errors in quantum chemistry.
  • The method significantly enhances computational accuracy on current quantum hardware.
  • REM shows promise for scalable and reliable quantum computations in chemistry and beyond.