Pre-fixed Threshold Real Time Selection Method in Free-space Quantum Key Distribution
arXiv:1712.08949 · doi:10.1103/PhysRevA.97.032337
Abstract
Free-space Quantum key distribution (QKD) allows two parties to share a random key with unconditional security, between ground stations, between mobile platforms, and even in satellite-ground quantum communications. Atmospheric turbulence causes fluctuations in transmittance, which further affect the quantum bit error rate (QBER) and the secure key rate. Previous post-selection methods to combat atmospheric turbulence require a threshold value determined after all quantum transmission. In contrast, here we propose a new method where we pre-determine the optimal threshold value even before quantum transmission. Therefore, the receiver can discard useless data immediately, thus greatly reducing data storage requirement and computing resource. Furthermore, our method can be applied to a variety of protocols, including, for example, not only single-photon BB84, but also asymptotic and finite-size decoy-state BB84, which can greatly increase its practicality.
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- Zigzag approach to higher key rate of sending-or-not-sending twin field quantum key distribution with finite key effects
- Cross-encoded quantum key distribution exploiting time-bin and polarization states with qubit-based synchronization
- Experimental decoy state BB84 quantum key distribution through a turbulent channel
- Numerical simulations of atmospheric quantum channels
- Characterization of free-space quantum channels
- Dynamic attenuation scheme in measurement-device-independent quantum key distribution over turbulent channels
- Time correlations in atmospheric quantum channels
- Adaptive Techniques in Practical Quantum Key Distribution
- Circular-beam approximation for quantum channels in a turbulent atmosphere