Quantum-communications technologies, especially involving teleportation, will play an increasingly important role in both the domestic and defense sectors because of the promise for improved security, distributed quantum computing, and quantum sensing. This paper presents a review of this emerging field, summarizing key protocols as well as some representative quantum teleportation experiments conducted both in the laboratory and in the field. Briefly, in recent years, quantum teleportation has been demonstrated in both optical-fiber networks and in long-distance free-space channels, using entanglement on photonic chips as well as between photonic and atom/ion or solid-state qubits.
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