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The seamless integration of QKD systems into existing and next-generation metro-access architectures is performed under the umbrella of the FFG project QKD-TELCO. Polarization-entangled QKD is applied in combination with multiplexing technology in order to guarantee high secure key rates without the use of a separate transmission fibre for quantum channels. The overall communication link is designed in such a way that existing and subsequent PON standards (GPON/EPON, XGPON/10G-EPON and also NGPON2) can benefit from a simultaneously present secure link for key generation, as do metro networks where amplified DWDM links co-exist with QKD channels.