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Spectral filtering and crystal length as control parameters for conditional correlations in quantum imaging — arXiv:2608.16524

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.16524
License (as archived): CC0-1.0
Archived: 2026-10-19T01:02:59.768Z
SHA-256 of the archived text: fc6d4afd0aaf091cca6a4bbcb84ed2c059519e64392b3c218185af5e1ad26395
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Spectral filtering and crystal length as control parameters for conditional correlations in quantum imaging — arXiv:2608.16524 — arXiv (en), https://arxiv.org/abs/2608.16524 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_fe9a67bf3950 (Metraipolis archive dc_fe9a67bf3950, sha256 fc6d4afd0aaf091cca6a4bbcb84ed2c059519e64392b3c218185af5e1ad26395)

BibTeX

@misc{dcfe9a67bf3950,
  title = {Spectral filtering and crystal length as control parameters for conditional correlations in quantum imaging — arXiv:2608.16524},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.16524},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_fe9a67bf3950; sha256 fc6d4afd0aaf091cca6a4bbcb84ed2c059519e64392b3c218185af5e1ad26395},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.16524. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

We establish spectral filtering as a control parameter for the conditional momentum and position correlations of SPDC biphotons used in quantum imaging. The conditional momentum uncertainty in spontaneous parametric down-conversion (SPDC) is strongly crystal-length and spectral-filter dependent along the walk-off axis; therefore, the effect is observed only in critically phase-matched (CPM) crystals such as $\beta$-barium borate (BBO) crystals, while quasi-phase-matched (QPM) crystals and the non-walk-off axis of BBO remain scaled strictly according to the standard pump waist size ($w_0$) dependent scaling law $1/w_0$-independent of the filter. In position space, the spectral-filter effect is universal and produces a flat-dip-rise (FDR) profile in every crystal class examined. Although this FDR profile was previously demonstrated in BBO only in the nondegenerate regime, our results establish its generality: the FDR dip is also present at exact degeneracy in QPM crystals, an unexpected feature that was previously thought to deliver a resolution advantage in the nondegenerate regime alone. Our treatment applies to all SPDC-based quantum-imaging regimes (including CPM and QPM crystals, walk-off and non-walk-off axes, degenerate and nondegenerate emission, and signal and idler filtering) and offers enhanced quantum-imaging resolution via the design rules presented-most prominently along the walk-off axis of CPM crystals (in far field) and across all transverse axes in the near field.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-08-18 in quant-ph).
Categorie arXiv: Quantum Physics (quant-ph).
Pagina del lavoro: https://arxiv.org/abs/2608.16524 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-19T00:29:15.414Z dalla pagina https://arxiv.org/catchup/quant-ph/2026-08-18?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).