title: Quantum key distribution using quantum Faraday rotators.
abstract: We propose a new quantum key distribution (QKD) protocol based on the fully quantum mechanical states of Faraday rotators. The protocol is unconditionally secure against collective attacks for a multi-photon source of up to two photons on a noisy environment. It is also robust against impersonation attacks. The protocol may be implemented experimentally with the current spintronics technology on semiconductors.
authors.affiliation: Department of Physics, Korea University, Seoul 136-713, Korea. Barom Liveral Arts College, Seoul Women's University, Seoul 139-774, Korea.
authors.forename: Taeseung
authors.initials: T
authors.lastname: Choi
authors.forename: Mahn-Soo
authors.initials: MS
authors.lastname: Choi