Multiphoton path-entanglement generation by concurrent parametric down-conversion in a single χ(2) nonlinear photonic crystal
Abstract
We propose a two-dimensional χ(2) nonlinear photonic crystal capable of satisfying quasi-phase-matching conditions for two or three parametric down-conversions simultaneously. Seeded by a two-mode coherent state, this crystal can produce two-, three-, four-, or five-photon path-entangled states, provided the corresponding number photons are produced, i.e., in a postselection-free way. In particular, up to five-photon NOON state can be generated, which enables phase supersensitive measurements at the Heisenberg limit. The concurrent multiple quasi-phase-matchings provided by the nonlinear photonic crystal open up a way to integrated quantum light sources.
- Publication:
-
Physical Review A
- Pub Date:
- August 2012
- DOI:
- 10.1103/PhysRevA.86.023835
- Bibcode:
- 2012PhRvA..86b3835G
- Keywords:
-
- 42.50.Dv;
- 03.67.Bg;
- 42.50.St;
- 42.65.Lm;
- Nonclassical states of the electromagnetic field including entangled photon states;
- quantum state engineering and measurements;
- Entanglement production and manipulation;
- Nonclassical interferometry subwavelength lithography;
- Parametric down conversion and production of entangled photons