Simple quantum key distribution with qubit-based synchronization and a self-compensating polarization encoder
Posted on 2020-03-31 - 20:44
Widespread adoption of Quantum Key Distribution (QKD) in current telecommunication networks will require the development of simple, low cost and stable systems. Current QKD implementations usually include separate sub-systems to implement auxiliary tasks such as temporal synchronization and polarization basis tracking. Here we present a QKD system with polarization encoding that performs synchronization, polarization compensation and QKD with the same optical setup without requiring any changes or any additional hardware. Polarization encoding is performed by a self-compensating Sagnac loop modulator which exhibits high stability and the lowest intrinsic QBER ever reported by an active polarization source fully implemented using only commercial off-the-shelf components. We tested our QKD system over a fiber-optic channel, tolerating up to 43~dB of total losses and representing an important step towards technologically mature QKD systems.
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Agnesi, Costantino; Avesani, Marco; Calderaro, Luca; Stanco, Andrea; Foletto, Giulio; Mujtaba, Zahidy; et al. (2020). Simple quantum key distribution with qubit-based synchronization and a self-compensating polarization encoder. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4868793.v1
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AUTHORS (10)
CA
Costantino Agnesi
MA
Marco Avesani
LC
Luca Calderaro
AS
Andrea Stanco
GF
Giulio Foletto
ZM
Zahidy Mujtaba
AS
Alessia Scriminich
FV
Francesco Vedovato
GV
Giuseppe Vallone
PV
Paolo Villoresi