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Designing three-way entangled and nonlocal two-way entangled single particle states via alternate quantum walks

Dinesh Kumar PandaColin Benjamin
Feb 2024
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摘要原文
Entanglement with single-particle states is advantageous in quantum technology because of their ability to encode and process information more securely than their multi-particle analogs. Three-way and nonlocal two-way entangled single-particle states are desirable in this context. Herein, we generate three-way entanglement from an initially separable state involving three degrees of freedom of a quantum particle, which evolves via a 2D alternate quantum walk employing a resource-saving single-qubit coin. We achieve maximum possible values for the three-way entanglement quantified by the $\pi$-tangle between the three degrees of freedom. We also generate optimal two-way nonlocal entanglement, quantified by the negativity between the nonlocal position degrees of freedom of the particle. This prepared architecture using quantum walks can be experimentally realized with a photon.
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