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Fast Quantum State Preparation and Bath Dynamics Using Non-Gaussian Variational Ansatz and Quantum Optimal Control.

Liam J Bond1,2, Arghavan Safavi-Naini1,2, Jiří Minář1,2,3

  • 1Institute for Theoretical Physics, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.

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|May 10, 2024
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This summary is machine-generated.

Researchers developed a fast, nonadiabatic method for preparing quantum many-body states using optimal control and variational Ansätze. This technique significantly reduces infidelity in quantum state preparation, crucial for quantum algorithms and metrology.

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Area of Science:

  • Quantum mechanics
  • Quantum information science
  • Condensed matter physics

Background:

  • Fast preparation of quantum many-body states is critical for advancing quantum algorithms and metrology.
  • Existing methods often face limitations in speed and fidelity.

Purpose of the Study:

  • To develop a novel, fast, nonadiabatic pathway for preparing quantum many-body states.
  • To improve the efficiency and accuracy of quantum state preparation.

Main Methods:

  • Combines quantum optimal control with a variational Ansatz utilizing non-Gaussian states.
  • Demonstrated on the spin-boson model, employing a multipolaron Ansatz for near-critical ground states.

Main Results:

  • Achieved significant reductions in infidelity compared to linear and optimized local adiabatic ramps (up to ≈60x for one mode).
  • Demonstrated up to ≈5x infidelity reduction for many modes compared to nonadiabatic linear ramps.
  • Introduced a controlled convergence criterion based on the number of polarons, outperforming leakage as a fidelity indicator.

Conclusions:

  • The developed method offers a substantial improvement in fast quantum state preparation.
  • The new convergence criterion provides a more reliable measure of state fidelity.
  • The approach is adaptable for systems with diverse bath couplings, relevant for trapped-ion experiments.