Quantum-correlation-based free-space optical link with an active
reflector
- URL: http://arxiv.org/abs/2206.14978v1
- Date: Thu, 30 Jun 2022 02:04:15 GMT
- Title: Quantum-correlation-based free-space optical link with an active
reflector
- Authors: Dongkyu Kim, Dohoon Lim, Kyungdeuk Park, and Yong Sup Ihn
- Abstract summary: We present a quantum-correlation-based free-space optical(FSO) link over 250 m using an outdoor active reflector 125 m from the transceiver station.
- Score: 0.5279804479251556
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We present a quantum-correlation-based free-space optical(FSO) link over 250
m using an outdoor active reflector 125 m from the transceiver station. The
performance of free-space optical communication can be significantly degraded
by atmospheric turbulence effects, such as beam wander and signal fluctuations.
We used a 660 nm tracking laser to reduce atmospheric effects, by analyzing the
fast beam wander and slow temporal beam drift, using this information to
correct the quantum channel alignment of the 810 nm signal photons. In this
work, the active reflector consisted of a mirror, a 6-axis hexapod stage, and a
long-range wireless bridge. The slow drift of the beam path due to outdoor
temperature changes was steered and controlled using wireless optical feedback
between the receiver units and the active reflector. Our work provides useful
knowledge for improved control of beam paths in outdoor conditions, which can
be developed to ensure high quality quantum information transfer in real-world
scenarios, such as an unmanned FSO link for urban quantum communication or
retro-reflective quantum communication links.
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