Bright, single-spatial-mode source of frequency non-degenerate, polarization-entangled photon pairs using periodically poled KTP

• We use two perpendicular crystals of periodically-poled KTP to directly generate polarization-entangled photon pairs, the majority of which are emitted into a single Gaussian spatial mode. The signal and idler photons have wavelengths of 810 nm and 1550 nm, respectively, and the photon-pair generation rate is 1.2 x 10(7) sec(-1) for a pump power of 62 mW. The apparatus is compact, flexible, and easily to use.

Nyckelord

Crystals

Light polarization

Multiphoton processes

Optical pumping

Probability

Quantum cryptography

Quantum theory

Single mode fibers

TECHNOLOGY

TEKNIKVETENSKAP

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