Passive switching scheme for two-way quantum key distribution setups
Guilherme P. Temporão · Electronics Letters · 2010
A simple design for Bob in two-way quantum key distribution schemes that employs only passive linear optical components to perform the necessary switching operations is presented. It is shown that, for some specific protocols and/or practical qubit implementations, the losses in Bob's station can be made negligible, hence increasing the maximum distance for secret key generation.