Highly nondegenerate polarization-entangled photon pairs produced through noncritical phasematching in single-domain KTiOPO$_4$
- URL: http://arxiv.org/abs/2502.18752v1
- Date: Wed, 26 Feb 2025 02:09:13 GMT
- Title: Highly nondegenerate polarization-entangled photon pairs produced through noncritical phasematching in single-domain KTiOPO$_4$
- Authors: Jia Boon Chin, Diane Prato, Alexander Ling,
- Abstract summary: A source of polarization-entangled photon pairs with low temperature sensitivity based on noncritical phasematched (NCPM) SPDC was demonstrated.<n>With the signal photons detected locally, the idler photons were transmitted through 62km and 93km of deployed telecom fibers.
- Score: 44.99833362998488
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Photon-pair sources are useful for entanglement distribution. The most mature of these are spontaneous parametric downconversion (SPDC) sources, most of which achieve phasematching via engineering the domains in poled crystals or the angle between the optic axis and the pump beam. For multi-channel entanglement distribution of photon pairs, where one photon is transmitted through free-space and the other photon is transmitted through fiber, it is beneficial to use highly nondegenerate photon-pair sources. The currently accepted approach in such sources is quasi-phasematching. In this paper, a simpler, more stable alternative is presented for producing highly nondegenerate photon pairs. A source of polarization-entangled photon pairs with low temperature sensitivity based on noncritical phasematched (NCPM) SPDC in single-domain potassium titanyl phosphate (KTP) was demonstrated. Over a crystal temperature range of $75^\circ$C, the center wavelength of the idler photons was observed to change by $10.8$nm while the average entanglement visibility was maintained above $98\%$. With the signal photons detected locally, the idler photons were transmitted through 62km and 93km of deployed telecom fibers with average raw visibilities of $98.2(1)\%$ and $95.6(3)\%$ respectively.
Related papers
- Wavelength-Tunable and High-Heralding-Efficiency Quantum Photon Source in Birefringent Phase-Matched Lithium Niobate Waveguide [0.0]
Lithium niobate(LN) is a birefringent material, where the strong birefringence thermo-optic effect is promising for the generation of quantum photon source.<n>We demonstrate birefringent phase-matching in a 20-mm-long waveguide fabricated on 5$mu$m-thick x-cut lithium niobate on insulator.
arXiv Detail & Related papers (2024-12-16T01:58:39Z) - Compact Polarization-Entangled Photon Source Based on Coexisting Noncritically Birefringent and Quasi Phase Matching in a Nonlinear Crystal [0.0]
We show a novel source that generates collinear polarization-entangled photons in a periodically poled nonlinear crystal.
The compact source does not require interferometer, delicate domain structures, or post selection, and is advantageous for scalable quantum computing and communication.
arXiv Detail & Related papers (2024-06-11T10:10:33Z) - Time-resolved purification of photon pairs from ultrasmall sources [0.0]
We increase the purity of two-photon states generated in a 7 $mu$m film of lithium niobate from 0.002 to 0.99.
With the higher purity, we were able to observe and characterize different polarization states of photon pairs generated simultaneously due to relaxed phase matching.
arXiv Detail & Related papers (2023-07-10T18:56:20Z) - On-Demand Generation of Indistinguishable Photons in the Telecom C-Band
using Quantum Dot Devices [31.114245664719455]
We demonstrate the coherent on-demand generation of in photons in the telecom C-band from single QD devices.
The research represents a significant advancement in photon-indistinguishability of single photons emitted directly in the telecom C-band.
arXiv Detail & Related papers (2023-06-14T17:59:03Z) - A solid-state source of single and entangled photons at diamond
SiV$^-$-center transitions operating at 80K [0.0]
Epitaxially grown quantum dots hold great potential for on-demand generation of single and entangled photons with high purity and indistinguishability.
Coupling these emitters to memories with long coherence times enables the development of hybrid nanophotonic devices.
arXiv Detail & Related papers (2023-04-27T13:12:25Z) - Single photon optical bistability [55.2480439325792]
We investigate the bistability in a small Fabry-Perot interferometer (FPI) with the optical wavelength size cavity, the nonlinear Kerr medium and only a few photons, on average, excited by the external quantum field.
Multiple stationary states of the FPI cavity field with different spectra are possible at realistic conditions, for example, in the FPI with the photonic crystal cavity and the semiconductor-doped glass nonlinear medium.
arXiv Detail & Related papers (2023-04-15T10:44:51Z) - Optimised Domain-engineered Crystals for Pure Telecom Photon Sources [101.18253437732933]
We present a telecom-wavelength parametric down-conversion photon source that operates on the achievable limit of domain engineering.
We generate photons from independent sources which achieve two-photon interference visibilities of up to $98.6pm1.1%$ without narrow-band filtering.
arXiv Detail & Related papers (2021-01-20T19:00:04Z) - Temperature insensitive type II quasi-phasematched spontaneous
parametric downconversion [62.997667081978825]
The temperature dependence of the refractive indices of potassium titanyl phosphate (KTP) are shown to enable quasi-phasematched type II spontaneous parametric downconversion.
We demonstrate the effect experimentally, observing temperature-insensitive degenerate emission at 1326nm, within the telecommunications O band.
This result has practical applications in the development of entangled photon sources for resource-constrained environments.
arXiv Detail & Related papers (2020-12-09T16:14:15Z) - Understanding photoluminescence in semiconductor Bragg-reflection
waveguides: Towards an integrated, GHz-rate telecom photon pair source [47.399953444625154]
semiconductor integrated sources of photon pairs may operate at pump wavelengths much closer to the bandgap of the materials.
We show that devices operating near the long wavelength end of the S-band or the short C-band require temporal filtering shorter than 1 ns.
We predict that shifting the operating wavelengths to the L-band and making small adjustments in the material composition will reduce the amount of photoluminescence to negligible values.
arXiv Detail & Related papers (2020-10-12T06:27:30Z) - Near-ideal spontaneous photon sources in silicon quantum photonics [55.41644538483948]
Integrated photonics is a robust platform for quantum information processing.
Sources of single photons that are highly indistinguishable and pure, that are either near-deterministic or heralded with high efficiency, have been elusive.
Here, we demonstrate on-chip photon sources that simultaneously meet each of these requirements.
arXiv Detail & Related papers (2020-05-19T16:46:44Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.