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

Acta Sinica Quantum Optica

The Phase Compensation of the Generating Polarization Entangled Photon Pairs

张娜娜 ZHANG Na-na, 李淑静 LI Shu-jing, 闫红梅 YAN Hong-mei, 王海 WANG Hai

Published Jan 1, 2017• 2 citations
Publisher
DOI
10.3788/jqo20172303.0002

Related papers

Polarization-entangled photon pairs generated in aperiodically-poled KTP

Paulina S. Kuo, CH. S. S. Pavan Kumar, Anouar Rahmouni +3 more

We demonstrate polarization-entangled photon-pair generation in aperiodically poled KTiOPO4 (aPPKTP). The aperiodic poling allows two simultaneous downconversion processes corresponding to |HV ⟩ and |V H⟩ signal-idler states. Using a 775 nm pump, we obtained signal and idler at 1530.6 nm and 1569.8 nm, respectively. After compensating for the relative phase between the |HV ⟩ and |V H⟩ states, we obtain polarization entanglement visibilities greater than 0.98 using both pulsed and continuous-wave pumping. This compensation process is important because the relative phase is fixed by the poling pattern. These polarization-entangled photons are useful for distribution of entanglement across a quantum network.

Quantum Computing, Communication, and Simulation•Mar 5, 2026•0 citations

Generation of polarization-entangled photon pairs in a cold atomic ensemble

Yuelong, Wu, Shujing +9 more

中国科学通报：英文版•Jan 1, 2016•0 citations

Polarization-entangled photon pairs generation from a single lithium niobate waveguide with single poling period

Xinyue Zhang, Sihui Pei, Ni Yao +4 more

Polarization-entangled photon pairs are essential sources for photonic quantum information processing. However, generating entangled photon pairs with large detuning via spontaneous parametric down-conversion (SPDC) often requires complex configurations to compensate for phase matching. Here, we propose a simple and efficient scheme to generate polarization-entangled photon pairs based on type-0 SPDC in a thin-film lithium niobate waveguide with a single poling period. By utilizing the strong dispersion engineering capabilities of thin-film waveguides, we can achieve both degenerate and highly detuned entangled photon pairs. Furthermore, we demonstrate on-chip temporal compensation using an integrated waveguide structure. Our approach offers a compact and scalable solution for integrated quantum photonic circuits.

arXiv:2410.22789•Optics Express•Apr 16, 2025•3 citations

Generation of polarization-entangled photon pairs in a cold atomic ensemble

Yuelong Wu, Shujing Li, Wei Ge +3 more

中国科学通报：英文版•Jan 20, 2016•13 citations

Direct Generation of Polarization-Entangled Photon Pairs in a Poled Fiber

Eric Y. Zhu, Zhiyuan Tang, Li Qian +7 more

We experimentally demonstrate the direct generation of polarization-entangled photon pairs in an optical fiber at room temperature by exploiting type-II phase-matched spontaneous parametric down-conversion. A second-order nonlinearity is artificially induced in the 17-cm-long weakly birefringent step-index fiber through the process of thermal poling, and quasi-phase-matching allows for the generation of entangled photons in the 1.5-micron telecom band when the fiber is pumped at 775 nm. A greater-than 80:1 coincidence-to-accidental ratio is achieved, limited mainly by multiphoton pair generation. Without the need to subtract accidentals or to compensate for walk-off, the raw two-photon interference visibility is found to be better than 95%, and violation of Bell's inequality is observed by more than 18 standard deviations. This makes for a truly alignment-free, plug-and-play source of polarization-entangled photon pairs.

Physical Review Letters•May 21, 2012•83 citations

On-demand generation of indistinguishable polarization-entangled photon pairs

Markus A. Müller, S. Bounouar, Klaus D. Jöns +2 more

arXiv:1308.4257•Nature Photonics•Feb 14, 2014•466 citations
We demonstrate polarization-entangled photon-pair generation in aperiodically poled KTiOPO4 (aPPKTP). The aperiodic poling allows two simultaneous downconversion processes corresponding to |HV ⟩ and |V H⟩ signal-idler states. Using a 775 nm pump, we obtained signal and idler at 1530.6 nm and 1569.8 nm, respectively. After compensating for the relative phase between the |HV ⟩ and |V H⟩ states, we obtain polarization entanglement visibilities greater than 0.98 using both pulsed and continuous-wave pumping. This compensation process is important because the relative phase is fixed by the poling pattern. These polarization-entangled photons are useful for distribution of entanglement across a quantum network.
Polarization-entangled photon pairs are essential sources for photonic quantum information processing. However, generating entangled photon pairs with large detuning via spontaneous parametric down-conversion (SPDC) often requires complex configurations to compensate for phase matching. Here, we propose a simple and efficient scheme to generate polarization-entangled photon pairs based on type-0 SPDC in a thin-film lithium niobate waveguide with a single poling period. By utilizing the strong dispersion engineering capabilities of thin-film waveguides, we can achieve both degenerate and highly detuned entangled photon pairs. Furthermore, we demonstrate on-chip temporal compensation using an integrated waveguide structure. Our approach offers a compact and scalable solution for integrated quantum photonic circuits.
We experimentally demonstrate the direct generation of polarization-entangled photon pairs in an optical fiber at room temperature by exploiting type-II phase-matched spontaneous parametric down-conversion. A second-order nonlinearity is artificially induced in the 17-cm-long weakly birefringent step-index fiber through the process of thermal poling, and quasi-phase-matching allows for the generation of entangled photons in the 1.5-micron telecom band when the fiber is pumped at 775 nm. A greater-than 80:1 coincidence-to-accidental ratio is achieved, limited mainly by multiphoton pair generation. Without the need to subtract accidentals or to compensate for walk-off, the raw two-photon interference visibility is found to be better than 95%, and violation of Bell's inequality is observed by more than 18 standard deviations. This makes for a truly alignment-free, plug-and-play source of polarization-entangled photon pairs.