We introduce an elementary optical gate for expanding polarization entangled W 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 n -photon W state into this gate, we obtain an (n+2) -photon W state after postselection. This gate gives a better efficiency and a simpler implementation than previous proposals for W -state preparation.
|Original language||English (US)|
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|State||Published - Mar 25 2008|
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics