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Conference on Lasers and Electro-Optics

Single crystal source of polarization entangled photons at non-degenerate wavelengths

Sauge, Marcin Świłło, GUILHERME BARRETO XAVIER, Tengner, Anders Karlsson

Published Jan 1, 2008• 0 citations
Publisher
DOI
10.1109/qels.2008.4552948

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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 × 10 6 s −1 THz −1 mW −1 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.

Optics and Spectroscopy•Feb 1, 2010•1 citation
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 x 10(6) s(-1) THz(-1) mW(-1) 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.
Abstract The polarization‐entangled photon source (PEPS) at non‐degenerated wavelengths is pivotal to connect quantum systems working at different wavelengths, with the assistance of quantum teleportation. Here, a compact Sagnac‐type photon source is designed and demonstrated, in which two photons with wavelengths at 810 and 1550 nm are highly entangled in polarization degree of freedom. The two photons are generated from a periodically poled lithium niobate crystal pumped with a 532 nm continuous‐wave laser, via type‐0 nondegenerate spontaneous parametric down‐conversion. The polarization of three lights is rotated by a single periscope, which makes the Sagnac interferometer compact and stable. The generated two photons are with high brightness of pairs/s/mW, which are highly entangled with fidelity of . The entanglement is verified by violating the Clauser‐Horne‐Shimony‐Holt inequality with . Finally, teleportation is demonstrated with this nondegenerate source, in which photonic states at 810 nm is teleported to 1550 nm with fidelity of .
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 × 10 6 s −1 THz −1 mW −1 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.