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10 papers · 2 filters
Group Velocity of a Probe Light in an Ensemble of Lambda Atoms under Two-Photon Resonance
Y. Li, C. P. Sun
We study the propagation of a probe light in an ensemble of -type atoms, utilizing the dynamic symmetry as recently discovered when the atoms are coupled to a classical control…
Certain quantum key distribution achieved by using Bell states
Chong Li, He-Shan Song, Ling Zhou +1
A new protocol for quantum key distribution based on entanglement swapping is presented. In this protocol, both certain key and random key can be generated without any loss of secu…
A Two-Step Quantum Direct Communication Protocol Using Einstein-Podolsky-Rosen Pair Block
Fu-Guo Deng, Gui Lu Long, Xiao-Shu Liu
A protocol for quantum secure direct communication using blocks of EPR pairs is proposed. A set of ordered EPR pairs is used as a data block for sending secret message directly…
Controlled order rearrangement encryption for quantum key distribution
Fe-Guo Deng, Gui Lu Long
A novel technique is devised to perform orthogonal state quantum key distribution. In this scheme, entangled parts of a quantum information carrier are sent from Alice to Bob throu…
Adiabatic passage of collective excitations in atomic ensembles
Y. Li, Y. X. Miao, C. P. Sun
We describe a theoretical scheme that allows for transfer of quantum states of atomic collective excitation between two macroscopic atomic ensembles localized in two spatially-sepa…
Transient dynamics of light propagation in EIT medium and hidden symmetry of multi-bit quantum memory
Y. Li, X. F. Liu, C. P. Sun
We investigate the transient phenomenon or property of the propagation of an optical probe field in a medium consisting of many -type three-level atoms coupled to this probe fie…