Time-resolved purification of photon pairs from ultrasmall sources
- URL: http://arxiv.org/abs/2307.04855v1
- Date: Mon, 10 Jul 2023 18:56:20 GMT
- Title: Time-resolved purification of photon pairs from ultrasmall sources
- Authors: Vitaliy Sultanov, Maria Chekhova
- Abstract summary: 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.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Generation of entangled photons through spontaneous parametric
down-conversion (SPDC) from ultrasmall sources like thin films, metasurfaces,
or nanoantennas, offers unprecedented freedom in quantum state engineering.
However, as the source of SPDC gets smaller, the role of photoluminescence
increases, which leads to the contamination of two-photon states with thermal
background. Here we propose and implement a solution to this problem: by using
pulsed SPDC and time distillation, we increase the purity and the heralding
efficiency of the photon pairs. In the experiment, 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. In particular, we showed the presence of orthogonally
polarized photons, potentially usable for the generation of polarization
entanglement.
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