Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

New Physics Sae Mulli

Ghost Imaging Using Photon Pairs Generated from Parametric Down Conversion in Type-II Periodically-poled KTiOPO4

Hee Jung Lee, Geu Lim LEE, Heonoh Kim, Han Seb Moon

Published Jul 31, 2013• 0 citations
Publisher
DOI
10.3938/npsm.63.771

Related papers

Simultaneous type-0 and type-II spontaneous parametric down-conversions in a single periodically poled KTiOPO4 crystal

Hae June Lee, Heonoh Kim, M. Cha +1 more

Applied Physics B•Jun 16, 2012•14 citations

Waveguide source of correlated photon-pairs for chip-scale quantum information processing

Jun Chen, Aaron J. Pearlman, Alexander Ling +2 more

We present a systematic study of a correlated photon-pair source based on a periodically-poled KTiOPO4 (PPKTP) waveguide. The waveguide was fabricated on a KTiOPO4 crystal supporting type-II parametric down-conversion. In addition, periodic poling was applied along the waveguide to quasi-phase-match the type-0 down-conversion process. The design pump wavelength is 532 nm, and the wavelengths of the down-converted, correlated photons are around 900 nm and 1300 nm. We examine the two-photon correlation spectra and singlephoton spectra at a variety of temperature and power settings for both type-0 and type II down-conversion processes. Our study shows that the waveguide source has a number of advantages compared to its bulk-crystal counterpart, including higher spectral brightness, narrower emission bandwidth and single spatial-mode output. With greatly simplified engineering, this compact, highly efficient, low photon-loss, and cost-effective waveguide source of correlated photon pairs is promising for future chip-scale quantum information processing applications.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jul 21, 2009•0 citations

Source of polarization entanglement in a single periodically poled KTiOPO4 crystal with overlapping emission cones

Marco Fiorentino B, Christopher E. Kuklewicz, Franco N. C. Wong

We present a simple polarization entanglemenet source based on type-II phase-matched parametric down-conversion in periodically poled KTiOPO4. By use of noncritical phase matching in a noncollinear geometry the single-crystal source emits a cone of polarization-entangled photons. Two beams on opposite sides of the cone are selected for measurements to yield an observed flux of 820 pairs/s per mW of pump power with a two-photon fringe visibility of 96%. With this source we measure a violation of Bell's inequality of 140 standard deviations in 160 s.

Optics Express•Jan 1, 2005•55 citations

Indistinguishability of photon pair in a periodically poled KTiOPO4

Hee Jung Lee, Heonoh Kim, Sang Min Lee +1 more

Applied Physics B•Nov 19, 2015•3 citations

Experimental characterization of three-wave mixing in a multimode nonlinear KTiOPO4 waveguide

Michał Karpiński, Czesław Radzewicz, Konrad Banaszek

We report experimental determination of the phase-matching function for type-II three-wave mixing in a periodically poled KTiOPO4 waveguide in the 792–815 nm spectral region. The measurement was performed by sum-frequency generation of spectrally tuned fundamental components. Strong dependence of the observed signal on the excited spatial modes in the waveguide has been observed and fully interpreted. These results indicate a route to employ the waveguide for spontaneous parametric down-conversion producing photon pairs in well-defined spatial modes.

arXiv:0904.4577•Applied Physics Letters•May 4, 2009•38 citations

Efficient generation of a photon pair in a bulk periodically poled potassium titanyl phosphate

Bao‐Sen Shi, Chang Zhai, Guang‐Can Guo +2 more

Optics Communications•Jul 12, 2007•4 citations
We present a systematic study of a correlated photon-pair source based on a periodically-poled KTiOPO4 (PPKTP) waveguide. The waveguide was fabricated on a KTiOPO4 crystal supporting type-II parametric down-conversion. In addition, periodic poling was applied along the waveguide to quasi-phase-match the type-0 down-conversion process. The design pump wavelength is 532 nm, and the wavelengths of the down-converted, correlated photons are around 900 nm and 1300 nm. We examine the two-photon correlation spectra and singlephoton spectra at a variety of temperature and power settings for both type-0 and type II down-conversion processes. Our study shows that the waveguide source has a number of advantages compared to its bulk-crystal counterpart, including higher spectral brightness, narrower emission bandwidth and single spatial-mode output. With greatly simplified engineering, this compact, highly efficient, low photon-loss, and cost-effective waveguide source of correlated photon pairs is promising for future chip-scale quantum information processing applications.
We present a simple polarization entanglemenet source based on type-II phase-matched parametric down-conversion in periodically poled KTiOPO4. By use of noncritical phase matching in a noncollinear geometry the single-crystal source emits a cone of polarization-entangled photons. Two beams on opposite sides of the cone are selected for measurements to yield an observed flux of 820 pairs/s per mW of pump power with a two-photon fringe visibility of 96%. With this source we measure a violation of Bell's inequality of 140 standard deviations in 160 s.
We report experimental determination of the phase-matching function for type-II three-wave mixing in a periodically poled KTiOPO4 waveguide in the 792–815 nm spectral region. The measurement was performed by sum-frequency generation of spectrally tuned fundamental components. Strong dependence of the observed signal on the excited spatial modes in the waveguide has been observed and fully interpreted. These results indicate a route to employ the waveguide for spontaneous parametric down-conversion producing photon pairs in well-defined spatial modes.