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Phys Rev Lett. 2009 Apr 17;102(15):153902. Epub 2009 Apr 13.

Multipath entanglement of two photons.

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Dipartimento di Fisica, Sapienza Università di Roma, Roma 00185, Italy.


We present a novel optical device based on an integrated system of microlenses and single-mode optical fibers. It allows us to collect and direct into many modes two photons generated by spontaneous parametric down-conversion. By this device multiqubit entangled states and/or multilevel qudit states of two photons, encoded in the longitudinal momentum degree of freedom, are created. The multipath photon entanglement realized by this device is expected to find important applications in modern quantum information technology.

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