4.6 Article

Scalable W-type entanglement resource in neutral-atom arrays with Rydberg-dressed resonant dipole-dipole interaction

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PHYSICAL REVIEW A
卷 103, 期 2, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.103.022410

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  1. Deutsche Forschungsgemeinschaft (DFG) [SFB 1119 -236615297]

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This study demonstrates the creation of scalable entanglement resources in a different physical environment through the engineering of twisted W states in arrays of cold neutral atoms. By utilizing specific laser tuning and effective excitation-boson Hamiltonian, the desired W state can be prepared efficiently.
While the Rydberg-blockade regime provides the natural setting for creating W-type entanglement with cold neutral atoms, it is demonstrated here that a scalable entanglement resource of this type can even be obtained under completely different physical circumstances. To be more precise, a special instance of twisted W states-namely, pi-twisted ones-can be engineered in one-dimensional arrays of cold neutral atoms with Rydberg-dressed resonant dipole-dipole interaction. In particular, it is shown here that this is possible even when a (dressed) Rydberg excitation is coupled to the motional degrees of freedom of atoms in their respective, nearly harmonic optical-dipole microtraps, which are quantized into dispersionless (zero-dimensional) bosons. For a specially chosen (sweet-spot) detuning of the off-resonant dressing lasers from the relevant internal atomic transitions, the desired pi-twisted W state of Rydberg-dressed qubits is the ground state of the effective excitation-boson Hamiltonian of the system in a broad window of the relevant parameters. Being at the same time separated from the other eigenstates by a gap equal to the single-boson energy, this W state can be prepared using a Rabi-type driving protocol. The corresponding preparation times are independent of the system size and several orders of magnitude shorter than the effective lifetimes of the relevant atomic states.

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