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- Alarcon, Alvaro, 1991-, et al.
(författare)
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Few-Mode-Fiber Technology Fine-tunes Losses in Quantum Communication Systems
- 2021
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Ingår i: Physical Review Applied. - : AMER PHYSICAL SOC. - 2331-7019. ; 16:3
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Tidskriftsartikel (refereegranskat)abstract
- A natural choice for quantum communication is to use the relative phase between two paths of a single photon for information encoding. This method was nevertheless quickly identified as impractical over long distances, and thus a modification based on single-photon time bins has become widely adopted. It, how-ever, introduces a fundamental loss, which increases with the dimension and limits its application over long distances. Here solve this long-standing hurdle by using a few-mode-fiber space-division-multiplexing platform working with orbital-angular-momentum modes. In our scheme, we maintain the practicability provided by the time-bin scheme, while the quantum states are transmitted through a few-mode fiber in a configuration that does not introduce postselection losses. We experimentally demonstrate our proposal by successfully transmitting phase-encoded single-photon states for quantum cryptography over 500 m of few-mode fiber, showing the feasibility of our scheme.
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