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Article
| Open Access
Compensation-free high-dimensional free-space optical communication using turbulence-resilient vector beams
Resistance to turbulence is an ongoing challenge for point-to-point freespace communications. Here the authors present a protocol for encoding a large amount of information in vector beams that are transmittable through a moderately strong turbulent channel without adaptive beam compensation.
- Ziyi Zhu
- , Molly Janasik
- & Zhimin Shi
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Article
| Open Access
Point-to-point stabilized optical frequency transfer with active optics
Atomic clocks and their networks are useful tools for optical communications and frequency metrology. Here the authors use phase stabilization and active tip-tilt to suppress atmospheric effects and enable optical frequency transfer through free-space.
- Benjamin P. Dix-Matthews
- , Sascha W. Schediwy
- & Peter Wolf
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Article
| Open Access
Distribution of high-dimensional entanglement via an intra-city free-space link
Increasing the dimensionality of entangled states improves robustness and capacity of secure quantum communications, but it requires suitably modified setups. Here the authors report the distribution of high-dimensional polarization and energy-time entangled photons via a 1.2 km-long free-space link.
- Fabian Steinlechner
- , Sebastian Ecker
- & Rupert Ursin
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A complex multi-notch astronomical filter to suppress the bright infrared sky
The night sky viewed from Earth is very bright at infrared wavelengths due to atmospheric emission, making land-based astronomy difficult in this spectral region. Here, a photonic filter is demonstrated to suppress this unwanted light, opening new paths to infrared astronomy with current and future telescopes.
- J. Bland-Hawthorn
- , S.C. Ellis
- & C. Trinh
Atmospheric turbulence strength distribution along a propagation path probed by longitudinally structured optical beams