Bright source of narrowband polarization-entangled photons from a thick type-II ppKTP crystal
We demonstrate a high brightness (∼2.36 × 10 pairs/s/mW) polarization-entangled photon-pair source at 800-nm via spontaneous parametric down-conversion (SPDC) in a 3-cm long type-II ppKTP crystal pumped unidirectionally in a single-pass geometry. A high coincidences-to-accidentals ratio (CAR ∼ 1200)...
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Veröffentlicht in: | Optics express 2024-01, Vol.32 (3), p.3470-3479 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We demonstrate a high brightness (∼2.36 × 10
pairs/s/mW) polarization-entangled photon-pair source at 800-nm via spontaneous parametric down-conversion (SPDC) in a 3-cm long type-II ppKTP crystal pumped unidirectionally in a single-pass geometry. A high coincidences-to-accidentals ratio (CAR ∼ 1200) depicted by our source indicates a strong temporal correlation between the generated photon pairs. This correlated photon source is tunable from collinear to non-collinear emission of the photons and over a range of signal/idler wavelengths ∼8 - 9 nm corresponding to a temperature range of 20-60°C. We measure a quantum state fidelity
>95
with the singlet entangled state |
⟩=12(|
⟩-|
⟩) along with a violation of the CHSH-Bell's inequality by ∼485 standard deviations (S = 2.68 ± 0.0014). |
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ISSN: | 1094-4087 1094-4087 |
DOI: | 10.1364/OE.507372 |