A single-crystal source of path-polarization entangled photons at non-degenerate wavelengths

Abstract

We demonstrate a bright, narrowband, compact, quasi-phase-matched single-crystal source generating path-polarization-entangled photon pairs at 810 nm and 1550 nm at a maximum rate of 3 Mcounts/(s THz mW) after coupling to single-mode fiber, and with two-photon interference visibility above 90%. While the source can already be used to implement quantum communication protocols such as quantum key distribution, this work is also instrumental for narrowband applications such as entanglement transfer from photonic to atomic qubits, or entanglement of photons from independent sources.

7 pages, 3 figures, published in Optics Express (2008)

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Cited by in corpus (7)

• Entangled Photon-Pair Sources based on three-wave mixing in bulk crystals
• Three-color Sagnac source of polarization-entangled photon pairs
• Compact source of narrow-band counterpropagating polarization-entangled photon pairs using a single dual-periodically poled crystal
• Generation of modal and path-entangled photons using a domain-engineered integrated optical waveguide device
• Emulation of satellite up-link quantum communication with entangled photons
• Compact non-degenerate entangled-photon source and near-infrared-to-telecom quantum teleportation
• Practical random number generation protocol for entanglement-based quantum key distribution