2012/07/31 by T. Ferreira da Silva, D. Vitoreti, G. B. Xavier +3 · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physreva.88.052303
published as Phys. Rev. A 88, 052303 (2013)
arxiv created 2013/11/12 · arxiv updated 2013/11/13
We perform a proof-of-principle demonstration of the measurement-device-independent quantum key distribution (MDI-QKD) protocol using weak coherent states and polarization-encoded qubits over two optical fiber links of 8.5 km each. Each link was independently stabilized against polarization drifts using a full-polarization control system employing two wavelength-multiplexed control channels. A linear-optics-based polarization Bell-state analyzer was built into the intermediate station, Charlie, which is connected to both Alice and Bob via the optical fiber links. Using decoy-states, a lower bound for the secret-key generation rate of 1.04x10-6 bits/pulse is computed.