Efficient entanglement distribution over 200 kilometers
作者： J. F. Dynes , H. Takesue , Z. L. Yuan , A. W. Sharpe , K. Harada
DOI: 10.1364/OE.17.011440
关键词: Quantum sensor 、 Optics 、 Quantum entanglement 、 Quantum cryptography 、 Secure communication 、 Electronic engineering 、 Spontaneous parametric down-conversion 、 Avalanche photodiode 、 Quantum mechanics 、 Physics 、 Quantum channel 、 APDS
摘要: Here we report the first demonstration of entanglement distribution over a record distance 200 km which is sufficient fidelity to realize secure communication. In contrast previous schemes, use detection elements based on practical avalanche photodiodes (APDs) operating in self-differencing mode. These APDs are low-cost, compact and easy operate requiring only electrical cooling achieve high single photon efficiency. The combination with reliable parametric down-conversion source demonstrate that ultra-long distances has become both possible practical. Consequently outlook extremely promising for real world entanglement-based communication between distantly separated parties.
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