Experimental realization of quantum key distribution.

Aakash Warke, Bikash K. Behera, Prasanta Kumar Panigrahi

Mendonça, Fábio Alencar

In this dissertation it is realized a study about quantum key distribution (QKD) in optical networks. Initially, a review of the theory of quantum key distribution and some of its implementations with strongly attenuated coherent states, as well a review of an optical system for physical encryptation using mesoscopic coherent states are realized. Following, it is analyzed the use of an error correction scheme in the physical encryptation system, and two new schemes for quantum key distribution are proposed. The first is a possible implementation of a hybrid system, that is, using weak and mesoscopic coherent states, for QKD and quantum authentication of classical messages. The second is an implementation of a QKD system based on relative phase modulation of sidebands frequency, using two RF carriers and an amplitude modulator in Alice and a phase modulator in Bob. After, an experimental realization of a simple QKD setup using polarization states of strongly attenuated coherent states for B92 protocol is presented. At last, it is realized an experimental characterization of an optical receiver for optical communication applications.

Tapster, Gorman, Benton +3 more

Fábio Alencar Mendonça

In this dissertation it is realized a study about quantum key distribution (QKD) in optical networks. Initially, a review of the theory of quantum key distribution and some of its implementations with strongly attenuated coherent states, as well a review of an optical system for physical encryptation using mesoscopic coherent states are realized. Following, it is analyzed the use of an error correction scheme in the physical encryptation system, and two new schemes for quantum key distribution are proposed. The first is a possible implementation of a hybrid system, that is, using weak and mesoscopic coherent states, for QKD and quantum authentication of classical messages. The second is an implementation of a QKD system based on relative phase modulation of sidebands frequency, using two RF carriers and an amplitude modulator in Alice and a phase modulator in Bob. After, an experimental realization of a simple QKD setup using polarization states of strongly attenuated coherent states for B92 protocol is presented. At last, it is realized an experimental characterization of an optical receiver for optical communication applications.

Masahiro Takeoka

Yang Hao, Daqing Wang, Yu Liu

The research of Quantum Key Distribution (QKD) has progressed apace in recent years, among which decoy QKD using an effective classical process to obtain secure key without perfect quantum devices has been largely concerned. In this article, an overview of decoy quantum key distribution is provided. We primarily focus on the model of implementing decoy idea, which mainly includes decoy devices at the source side and the detector side. Then related experimental realizations of decoy idea is introduced, and some defects remained to be solved are emphasized. Then, we discuss the future of decoy QKD and finally come to a conclusion.