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Multipartite Entangled States in Dipolar Quantum Simulators.

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Scalable production of multipartite entangled states in quantum devices is demonstrated using U(1) symmetric Hamiltonians. Rydberg-atom arrays naturally generate spin-squeezed and Schrödinger

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Area of Science:

  • Quantum Information Science
  • Quantum Many-Body Physics
  • Quantum Metrology

Background:

  • Multipartite entangled states are crucial resources for quantum computation and metrology.
  • U(1) symmetric Hamiltonians with dipolar interactions are realized in platforms like Rydberg-atom arrays.
  • Understanding nonequilibrium dynamics is key to harnessing entanglement generation.

Purpose of the Study:

  • To investigate the entanglement-generating capabilities of U(1) symmetric Hamiltonians with dipolar interactions.
  • To compare the dynamics with the established one-axis-twisting model.
  • To assess the scalability of entanglement features for quantum metrology applications.

Main Methods:

  • Exact and variational simulations of qubit ensembles.
  • Theoretical analysis of nonequilibrium dynamics.
  • Investigation of systems with up to 144 qubits.

Main Results:

  • The dipolar Hamiltonian dynamics exhibit features similar to the one-axis-twisting model.
  • A cascade of entangled states, including spin-squeezed and Schrödinger's cat states, is generated.
  • Scalable spin squeezing and Heisenberg scaling of sensitivity are observed.

Conclusions:

  • Native Hamiltonian dynamics in quantum simulators like Rydberg-atom arrays can serve as a robust source of multipartite entanglement.
  • The observed entanglement features are directly relevant for advanced quantum metrology.
  • The scalability of entanglement generation is confirmed for practical applications.