Abstract
We introduce an elementary optical gate for expanding polarization entangled states in which every pair of photons is entangled alike. The gate is composed of a pair of 50:50 beamsplitters and ancillary photons in the two-photon Fock state. By seeding one of the photons in an -photon state into this gate, we obtain an -photon state after postselection. This gate gives a better efficiency and a simpler implementation than previous proposals for -state preparation.
- Received 20 September 2007
DOI:https://doi.org/10.1103/PhysRevA.77.030302
©2008 American Physical Society