Abstract
Quantum cryptography is a new technique, guaranteed by fundamental physics laws, used to distribute the bits of a key used in the encryption and decryption of messages. The early proposed systems used the photon's polarisation to encode the bits. However, when light propagates along the optical fiber, the light's polarisation changes randomly due to random variation of the fiber's birefringence. This fact imposes a limit in the fiber's length for systems using polarimetric quantum cryptography. Based in a quasi-stationary model, we propose an optical equaliser to recover the lost polarisation due to propagation in the optical fiber. The mathematics and simulations are presented.
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