Pure-state photon-pair source with a long coherence time for large-scale
quantum information processing
- URL: http://arxiv.org/abs/2306.17428v1
- Date: Fri, 30 Jun 2023 06:57:36 GMT
- Title: Pure-state photon-pair source with a long coherence time for large-scale
quantum information processing
- Authors: Bo Li, Yu-Huai Li, Yuan Cao, Juan Yin and Cheng-Zhi Peng
- Abstract summary: Hong-Ou-Mandel interference between independent photons plays a pivotal role in the large-scale quantum networks involving distant nodes.
We show a scheme for generating a pure-state photon-pair source with a long coherence time in periodically poled potassium titanyl phosphate crystals.
We experimentally developed this pure-state photon-pair source of 780 nm on PPKTP crystals pumped by a 390 nm pulsed laser.
- Score: 9.725825301858164
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The Hong-Ou-Mandel interference between independent photons plays a pivotal
role in the large-scale quantum networks involving distant nodes. Photons need
to work in a pure state for indistinguishability to reach high-quality
interference. Also, they need to have a sufficiently long coherence time to
reduce the time synchronization requirements in practical application. In this
paper, we discuss a scheme for generating a pure-state photon-pair source with
a long coherence time in periodically poled potassium titanyl phosphate (PPKTP)
crystals. By selecting the appropriate pump laser and filter, we could
simultaneously eliminate the frequency correlation of the parametric photons
while achieving a long coherence time. We experimentally developed this
pure-state photon-pair source of 780 nm on PPKTP crystals pumped by a 390 nm
pulsed laser. The source provided a coherence time of tens of picoseconds, and
it showed to have the potential to be applied in long-distance quantum
interference. Furthermore, we experimentally demonstrated the Hong-Ou-Mandel
(HOM) interference between two photon sources with visibility exceeding the
classical limit.
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