Quantum-correlation-based free-space optical link with an active reflector
arXiv:2206.14978 · doi:10.1016/j.cap.2022.06.018
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.
arXiv comment8 pages, 6 figures
References in corpus (8)
- Free-Space distribution of entanglement and single photons over 144 km
- Full daylight quantum-key-distribution at 1550 nm enabled by integrated silicon photonics
- Optimal Co-linear Gaussian Beams for Spontaneous Parametric Down-Conversion
- Airborne demonstration of a quantum key distribution receiver payload
- Optimal focusing for maximal collection of entangled narrow-band photon pairs into single-mode fibers
- A high-brightness source of polarization-entangled photons optimized for applications in free space
- Correction of beam wander for a free-space quantum key distribution system operating in urban environment
- Chromatic effects in beam wander correction for free-space quantum communications