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Polarization-encoded free-space Quantum Communication requires a quantumstate source featuring fast polarization modulation, long-term stability and alow intrinsic error rate. Here we present a source based on a Sagnacinterferometer and composed of polarization maintaining fibers, a fiberpolarization beam splitter and an electro-optic phase modulator. The systemgenerates predetermined polarization states with a fixed reference frame infree-space that does not require calibration neither at the transmitter nor atthe receiver. In this way we achieve long-term stability and low error rates. Aproof-of-concept experiment is also reported, demonstrating a Quantum Bit ErrorRate lower than 0.2% for several hours without any active recalibration of thedevices.

Stable, low-error and calibration-free polarization encoder for free-space quantum communication