  We present a pilot-assisted coherent intradyne reception methodology for
CV-QKD with true local oscillator. An optically phase-locked reference tone,
prepared using carrier-suppressed optical single-sideband modulation, is
multiplexed in polarisation and frequency to the 250 Mbaud quantum signal in
order to provide optical frequency- and phase matching between quantum signal
and local oscillator. Our concept allows for high symbol rates and can be
operated at an extremely low excess-noise level, as validated by experimental
measurements.
