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Entangling two transportable neutral atoms via local spin exchange.(RESEARCH: LETTER)(Report)

Kaufman, A.M. ; Lester, B.J. ; Foss-Feig, M. ; Wall, M.L. ; Rey, A.M. ; Regal, C.A.

Nature, Nov 12, 2015, Vol.527(7577), p.208(7) [Periódico revisado por pares]

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  • Título:
    Entangling two transportable neutral atoms via local spin exchange.(RESEARCH: LETTER)(Report)
  • Autor: Kaufman, A.M. ; Lester, B.J. ; Foss-Feig, M. ; Wall, M.L. ; Rey, A.M. ; Regal, C.A.
  • Assuntos: Atoms – Properties ; Quantum Mechanics – Research
  • É parte de: Nature, Nov 12, 2015, Vol.527(7577), p.208(7)
  • Descrição: To advance quantum information science, physical systems are sought that meet the stringent requirements for creating and preserving quantum entanglement. In atomic physics, robust two-qubit entanglement is typically achieved by strong, long-range interactions in the form of either Coulomb interactions between ions or dipolar interactions between Rydberg atoms (1-4). Although such interactions allow fast quantum gates, the interacting atoms must overcome the associated coupling to the environment and cross-talk among qubits (5-8). Local interactions, such as those requiring substantial wavefunction overlap, can alleviate these detrimental effects; however, such interactions present a new challenge: to distribute entanglement, qubits must be transported, merged for interaction, and then isolated for storage and subsequent operations. Here we show how, using a mobile optical tweezer, it is possible to prepare and locally entangle two ultracold neutral atoms, and then separate them while preserving their entanglement (9-11). Ground-state neutral atom experiments have measured dynamics consistent with spin entanglement (10,12,13), and have detected entanglement with macroscopic observables (14,15); we are now able to demonstrate position-resolved two-particle coherence via application of a local gradient and parity measurements (1). This new entanglement-verification protocol could be applied to arbitrary spin-entangled states of spatially separated atoms (16,17). The local entangling operation is achieved via spin-exchange interactions (9-11), and quantum tunnelling is used to combine and separate atoms. These techniques provide a framework for dynamically entangling remote qubits via local operations within a large-scale quantum register.
  • Idioma: Inglês

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