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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Quantum Nuclear Dynamics on a Distributed Set of Ion-Trap Quantum Computing Systems.

Anurag Dwivedi1,2, A J Rasmusson2,3, Philip Richerme2,3

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This summary is machine-generated.

This study demonstrates quantum nuclear dynamics on a trapped-ion quantum computer, achieving chemical accuracy for molecular vibrational spectra. It pioneers distributed quantum computing for complex chemical dynamics simulations.

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Area of Science:

  • Quantum Computing
  • Chemical Dynamics
  • Molecular Spectroscopy

Background:

  • Quantum nuclear dynamics are computationally challenging for classical systems.
  • Quantum information processing offers a potential solution for these intractable problems.
  • Hydrogen-bonded systems exhibit complex proton dynamics crucial for chemical reactions.

Purpose of the Study:

  • To experimentally emulate quantum nuclear wavepacket dynamics using a trapped-ion quantum computer.
  • To investigate shared-proton dynamics in short-strong hydrogen-bonded systems.
  • To demonstrate the first application of distributed quantum computing for chemical dynamics.

Main Methods:

  • Utilized IonQ's 11-qubit trapped-ion quantum computer, Harmony.
  • Emulated quantum nuclear wavepacket evolution along potential energy surfaces.
  • Employed a tensor network formalism for distributed quantum computation.
  • Extracted time-dependent spatial projections and vibrational frequencies.

Main Results:

  • Achieved good agreement between experimental quantum results and classical simulations for wavepacket dynamics.
  • Obtained vibrational eigenenergies with chemical accuracy (within 0.1 kcal/mol of classical simulations).
  • Successfully demonstrated parallel quantum computation across a distributed set of ion-trap quantum computers.

Conclusions:

  • The developed approach offers a new paradigm for studying molecular quantum chemical dynamics and vibrational spectra.
  • This work validates the use of quantum computers for simulating complex chemical phenomena.
  • Presents the first successful application of distributed quantum computing in the field of chemical dynamics.