5 research outputs found
High-speed integrated QKD system
Quantum key distribution (QKD) is nowadays a well established method for
generating secret keys at a distance in an information-theoretic secure way, as
the secrecy of QKD relies on the laws of quantum physics and not computational
complexity. In order to industrialize QKD, low-cost, mass-manufactured and
practical QKD setups are required. Hence, photonic and electronic integration
of the sender's and receiver's respective components is currently in the
spotlight. Here we present a high-speed (2.5 GHz) integrated QKD setup
featuring a transmitter chip in silicon photonics allowing for high-speed
modulation and accurate state preparation, as well as a
polarization-independent low-loss receiver chip in aluminum borosilicate glass
fabricated by the femtosecond laser micromachining technique. Our system
achieves raw bit error rates, quantum bit error rates and secret key rates
equivalent to a much more complex state-of-the-art setup based on discrete
components
High-speed integrated QKD system
Quantum key distribution (QKD) is nowadays a well-established method for generating secret keys at a distance in an information-theoretically secure way, as the secrecy of QKD relies on the laws of quantum physics and not on computational complexity. In order to industrialize QKD, low-cost, mass-manufactured, and practical QKD setups are required. Hence, photonic and electronic integration of the sender’s and receiver’s respective components is currently in the spotlight. Here we present a high-speed (2.5 GHz) integrated QKD setup featuring a transmitter chip in silicon photonics allowing for high-speed modulation and accurate state preparation, as well as a polarization-independent low-loss receiver chip in aluminum borosilicate glass fabricated by the femtosecond laser micromachining technique. Our system achieves raw bit error rates, quantum bit error rates, and secret key rates equivalent to a much more complex state-of-the-art setup based on discrete components [Boaron A. et al. , Phys. Rev. Lett. 121 , 190502 (2018)].</p