Progress Toward Quantum Communications Networks: Opportunities and Challenges
Quantum communications is fast becoming an important component of many applications in quantum information science. Sharing quantum information over a distance among geographically separated nodes using photonic qubits requires a reconfigurable transparent networking infrastructure that can support quantum information services. Using Quantum Key Distribution (QKD) as an example of a quantum communications service, the authors investigate the ability of fiber networks to support both conventional optical traffic and single-photon quantum communications signals on a shared infrastructure. The effect of Raman scattering from conventional channels on the Quantum Bit Error Rate (QBER) of a QKD system is analyzed.