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Area of Science:

  • Quantum Mechanics
  • Quantum Computing
  • Foundational Physics

Background:

  • Quantum computers offer potential beyond commercial applications, particularly for foundational quantum mechanics.
  • The Consistent Histories formalism is a key tool for studying quantum cosmology, paradoxes, and the quantum-to-classical transition.

Purpose of the Study:

  • To explore the utility of quantum computers for the Consistent Histories formalism.
  • To develop a novel algorithm for finding consistent histories, making classically intractable calculations feasible.

Main Methods:

  • A variational hybrid quantum-classical algorithm was developed.
  • The quantum computer evaluates the decoherence functional with exponential speedup.
  • A classical optimizer refines history parameters for improved consistency.

Main Results:

  • The algorithm was implemented on a cloud quantum computer for a spin system.
  • Emergence of classicality was observed for a chiral molecule using a simulator.
  • Demonstrated exponential speedup in decoherence functional evaluation.

Conclusions:

  • The developed algorithm revitalizes interest in the Consistent Histories formalism.
  • Quantum computing provides a powerful new avenue for investigating foundational quantum mechanics.
  • The hybrid approach enables previously impossible calculations in quantum physics.