A one-time shot-noise calibration that normalizes by total homodyne noise is shown to match a trusted-detector entanglement-based model and to achieve key rates comparable to the two-step method.
Long-Distance Continuous-Variable Quantum Key Distribution over 202.81 km of Fiber
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abstract
Quantum key distribution provides secure keys resistant to code-breaking quantum computers. The continuous-variable version of quantum key distribution offers the advantages of higher secret key rates in metropolitan areas, as well as the use of standard telecom components that can operate at room temperature. However, the transmission distance of these systems (compared with discrete-variable systems) are currently limited and considered unsuitable for long-distance distribution. Herein, we report the experimental results of long distance continuous-variable quantum key distribution over 202.81 km of ultralow-loss optical fiber by suitably controlling the excess noise and employing highly efficient reconciliation procedures. This record-breaking implementation of the continuous-variable quantum key distribution doubles the previous distance record and shows the road for long-distance and large-scale secure quantum key distribution using room-temperature standard telecom components.
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One-Time Shot-Noise Unit Calibration Method for Continuous-Variable Quantum Key Distribution
A one-time shot-noise calibration that normalizes by total homodyne noise is shown to match a trusted-detector entanglement-based model and to achieve key rates comparable to the two-step method.