Free-space quantum key distribution (QKD) provides crucial advantages, including mobility and deployment flexibility, for securing next-generation communication networks. However, practical free-space implementations face major challenges, such as muilti-photon vulnerabilities, spatial mode mismatch, and atmospheric turbulence-induced beam fluctuations. In this work, we experimentally demonstrate a free-space decoy-state BB84 QKD system operating at a 100 MHz repetition rate with a 2.5 ns pulse width over a 2 km outdoor channel. By employing an active beam-wander correction based on fast-steering mirrors (FSMs) and position sensitive detectors (PSDs) con?figuration, our system achieves a secure key rate of 164.8 kbps under a quantum bit error rate (QBER) of approximately 3.3 %. This demonstration provides a practical framework for deploying high-rate, long-distance free-space quantum communication in realistic turbulence environments.
Quantum key distribution (QKD) enables information-theoretically secure communication by exploiting the quantum properties of single photons. Real-world deployment of QKD, however, requires reliable operation under uncontrolled environmental conditions where background illumination, atmospheric loss, coupling fluctua...
Twin-field (TF) quantum key distribution (QKD) offers a promising approach to long-distance QKD networks due to its superior performance over large channel losses. Due to specialized hardware requirements, nearly all long-distance TFQKD demonstrations have only two users exchanging keys, rather than a network with thre...
Reem Mandil, Yen-An Shih, A. Verma et al.· 0 citations
We experimentally demonstrate an entanglement-based Quantum-Secure Time Transfer (QSTT) system in an emulated low Earth orbit satellite-to-ground channel using a type-0 Sagnac-based entangled-photon source. Our new QSTT system delivers a finite Quantum Key Distribution (QKD) key rate of approximately $3~$bits$~\text{s}...
Ravi Singh Adhikari, Anju Rani, Aman Gupta et al.· 1 citation
We report on the adaptation of a commercially available fiber-based quantum key distribution (QKD) system with phase-time encoding to free-space operation. The proposed approach minimizes architectural modifications by replacing the single-mode receiving interferometer with a free-space multi-mode delay interferometer,...
V. V. Tretiakov, A. N. Klimov, K. A. Balygin et al.· Journal of Physics, Conferen...· 0 citations
Gaussian-modulated coherent-state (GMCS) continuous-variable quantum key distribution (CV-QKD) offers a practical path to quantum-secured communication owing to its compatibility with existing optical fibre networks and use of mature security proofs. Achieving high secret key rates in real-time systems, however, re...
Adam Alderton, Amanda Weerasinghe, Muataz Alhussein et al.· npj Quantum Information· 0 citations
Quantum key distribution (QKD) provides secure keys with information-theoretic security ensured by the principles of quantum mechanics. The flexibility and efficient deployment of free-space optical (FSO) quantum key distribution systems can make them highly advantageous. Despite the benefits of free-space transmission...
Ibtihaj Hameed, S. Tawfeeq· Al-Nahrain Journal for Engin...· 0 citations
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