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Entangling three qubits without ever touching

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arxiv 1807.05546 v3 pith:ZWIQ625G submitted 2018-07-15 quant-ph

Entangling three qubits without ever touching

classification quant-ph
keywords particlesentanglementstatethreetouchingaccessibleanotheranyon
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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All identical particles are inherently correlated from the outset, regardless of how far apart their creation took place. In this paper, this fact is used for extraction of entanglement from independent particles unaffected by any interactions. Specifically, we are concerned with operational schemes for generation of all tripartite entangled states, essentially the GHZ state and the W state, which prevent the particles from touching one another over the entire evolution. The protocols discussed in the paper require only three particles in linear optical setups with equal efficiency for boson, fermion or anyon statistics. Within this framework indistinguishability of particles presents itself as a useful resource of entanglement accessible for practical applications.

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