Quantum key establishment via a multimode fiber
arXiv:1801.07180 · doi:10.1364/OE.380791
Abstract
Quantum communication aims to provide absolutely secure transmission of secret information. State-of-the-art methods encode symbols into single photons or coherent light with much less than one photon on average. For long distance communication, typically a single-mode fiber is used and significant effort has been devoted already to increase the data carrying capacity of a single optical line. Here we propose and demonstrate a fundamentally new concept for remote key establishment. Our method allows high-dimensional alphabets using spatial degrees of freedom by transmitting information through a light-scrambling multimode fiber and exploiting the no-cloning theorem. Eavesdropper attacks can be detected without using randomly switched mutually unbiased bases. We prove the security against a common class of intercept-resend and beam-splitting attacks with single-photon Fock states and with weak coherent light. Since it is optical fiber based, our method allows to naturally extend secure communication to larger distances. We experimentally demonstrate this new type of key exchange method by encoding information into a few-photon light pulse decomposed over guided modes of an easily available multimode fiber.
16 pages, 3 figures
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- Metro-scale QKD using multimode fiber
- Implementation of space-division multiplexed entanglement-based quantum cryptography over multicore fiber
- Extraction of Bend-Resolved Modal Basis in Deformed Multimode Fiber
- Impulse Response Characterization of a Commercial Multimode Fiber using Superconducting Nanowire Single-Photon Detectors
- Characterization of spatial Schmidt modes in high-gain SU(1,1) interferometers
- Security of deterministic key distribution with higher-dimensional systems