Multiphoton entanglement through a Bell multiport beam splitter
arXiv:quant-ph/0406047 · doi:10.1103/PhysRevA.71.062311
Abstract
Multiphoton entanglement is an important resource for linear optics quantum computing. Here we show that a wide range of highly entangled multiphoton states, including W-states, can be prepared by interfering single photons inside a Bell multiport beam splitter and using postselection. A successful state preparation is indicated by the collection of one photon per output port. An advantage of the Bell multiport beam splitter is that it redirects the photons without changing their inner degrees of freedom. The described setup can therefore be used to generate polarisation, time-bin and frequency multiphoton entanglement, even when using only a single photon source.
8 pages, 2 figures, carefully revised version, references added
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