Genuine time-bin-encoded quantum key distribution over a turbulent depolarizing free-space channel
| Autor: | Katanya B. Kuntz, Sascha Agne, Christopher J. Pugh, Brendon L. Higgins, Jeongwan Jin, Jean-Philippe Bourgoin, Thomas Jennewein, Ramy Tannous |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Quantum Physics Photon business.industry FOS: Physical sciences Quantum channel Quantum key distribution Topology 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Optics Qubit 0103 physical sciences Quantum information Photonics 010306 general physics business Quantum information science Quantum Physics (quant-ph) Quantum teleportation |
| DOI: | 10.48550/arxiv.1903.06954 |
| Popis: | Despite its widespread use in fiber optics, encoding quantum information in photonic time-bin states is usually considered impractical for free-space quantum communication as turbulence-induced spatial distortion impedes the analysis of time-bin states at the receiver. Here, we demonstrate quantum key distribution using time-bin photonic states distorted by turbulence and depolarization during free-space transmission. Utilizing a novel analyzer apparatus, we observe stable quantum bit error ratios of 5.32 %, suitable for generating secure keys, despite significant wavefront distortions and polarization fluctuations across a 1.2 km channel. This shows the viability of time-bin quantum communication over long-distance free-space channels, which will simplify direct fiber/free-space interfaces and enable new approaches for practical free-space quantum communication over multi-mode, turbulent, or depolarizing channels. |
| Databáze: | OpenAIRE |
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