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Entanglement swapping with atoms separated by long distance
Yuan Chun-Hu,Ou Yong-Cheng,Zhang Zhi-Ming,
袁春华
,欧永成,张智明

中国物理 B , 2006,
Abstract: This paper proposes a scheme for entanglement swapping based on cavity QED. The two atoms to be entanglement-swapped can be separated over long distance. The scheme is a non-post-selection one with the success probability of 1/2.
Long distance entanglement swapping with photons from separated sources  [PDF]
H. de Riedmatten,I. Marcikic,J. A. W. van Houwelingen,W. Tittel,H. Zbinden,N. Gisin
Physics , 2004, DOI: 10.1103/PhysRevA.71.050302
Abstract: We report the first experimental realization of entanglement swapping over large distances in optical fibers. Two photons separated by more than two km of optical fibers are entangled, although they never directly interacted. We use two pairs of time-bin entangled qubits created in spatially separated sources and carried by photons at telecommunication wavelengths. A partial Bell state measurement is performed with one photon from each pair which projects the two remaining photons, formerly independent onto an entangled state. A visibility high enough to violate a Bell inequality is reported, after both photons have each travelled through 1.1 km of optical fiber.
Entanglement Swapping: Entangling Atoms That Never Interacted  [PDF]
E. S. Guerra,C. R. Carvalho
Physics , 2005, DOI: 10.1080/09500340500352790
Abstract: In this paper we discuss four different proposals of entangling atomic states of particles which have never interacted. The experimental realization proposed makes use of the interaction of Rydberg atoms with a micromaser cavity prepared in either a coherent state or in a superposition of the zero and one field Fock states. We consider atoms in either a three-level cascade or lambda configuration
Quantum Entanglement in a System of Two Spatially Separated Atoms Coupled to the Thermal Reservoir
LIAO Xiang-Ping,FANG Mao-Fa,ZHENG Xiao-Juan&sup,CAI Jian-Wu,
廖湘萍
,方卯发,郑小娟,蔡建武

中国物理快报 , 2006,
Abstract: We study quantum entanglement between two spatially separated atoms coupled to the thermal reservoir. The influences of the initial state of the system, the atomic frequency difference and the mean number of the thermal field on the entanglement are examined. The results show that the maximum of the entanglement obtained with nonidentical atoms is greater than that obtained with identical atoms. The degree of entanglement is progressively decreased with the increase of the thermal noise. Interestingly, the two atoms can be easily entangled even when the two atoms are initially prepared in the most mixed states.
Stationary entanglement between two spatially separated atoms driven by a coherent laser field
Liao Xiang-Ping,Fang Mao-F,Zheng Xiao-Juan,Cai Jian-Wu,
廖湘萍
,方卯发,郑小娟,蔡建武

中国物理 B , 2007,
Abstract: This paper studies quantum entanglement between two spatially separated atoms driven by a coherent laser field in the dissipative process of spontaneous emission. It is shown that the entanglement strongly depends on the detuning of the laser frequency from atomic transition frequency, the interatomic separation and the Rabi frequency of the coherent laser field. A considerable amount of steady state entanglement can be obtained near Δ=-α (i.e., the dipole--dipole interaction and the detuning cancel out mutually) for small atomic separation and large Rabi frequency of the coherent laser field.
Photon exchange and correlations transfer in atom-atom entanglement dynamics  [PDF]
Juan León,Carlos Sabín
Physics , 2008, DOI: 10.1103/PhysRevA.79.012301
Abstract: We analyze the entanglement dynamics of a system composed by a pair of neutral two-level atoms that are initially entangled, and the electromagnetic field, initially in the vacuum state, within the formalism of perturbative quantum field theory up to the second order. We show that entanglement sudden death and revival can occur while the atoms remain spacelike-separated and therefore cannot be related with photon exchange between the atoms. We interpret these phenomena as the consequence of a transfer of atom-atom entanglement to atom-field entanglement and viceversa. We also consider the different bi-partitions of the system, finding similar relationships between their entanglement evolutions.
Entropy of entangled three-level atoms interacting with entangled cavity fields: entanglement swapping  [PDF]
Wen-Chao Qiang,W. B. Cardoso,Xin-Hui Zhang
Physics , 2010, DOI: 10.1016/j.physa.2010.07.021
Abstract: The dynamics of an entangled atomic system in a partial interaction with entangled cavity fields, characterizing an entanglement swapping, have been studied through the use of Von Neuman entropy. We consider the interaction via two-photon process given by a full microscopical Hamiltonian approach. The explicit expression of the entropy is obtained, wherewith we estimated the largest period. The numerical simulation of the entropy of the entangled atomic and cavity systems shows that its time evolution presents multi-periodicity. The effects of detuning parameter on the period and the amplitude of the entropy are also discussed.
Entanglement swapping between atom and cavity and generation of entangled state of cavity fields
Chen Ai-Xi,Deng Li,
陈爱喜
,邓 黎

中国物理 B , 2007,
Abstract: This paper proposes a scheme where entanglement swapping between atom and cavity can be realized. \Lambda -type three-level atoms interacting resonantly with cavity field are considered. By detecting atom and cavity field, it realizes entanglement swapping between atom and cavity. It uses the technique of entanglement swapping to generate an entangled state of two cavity fields by measuring on atoms. It discusses the experimental feasibility of the proposed scheme and application of entangled state of cavity fields.
Macroscopic Entanglement by Entanglement Swapping  [PDF]
Stefano Pirandola,David Vitali,Paolo Tombesi,Seth Lloyd
Physics , 2005, DOI: 10.1103/PhysRevLett.97.150403
Abstract: We present a scheme for entangling two micromechanical oscillators. The scheme exploits the quantum effects of radiation pressure and it is based on a novel application of entanglement swapping, where standard optical measurements are used to generate purely mechanical entanglement. The scheme is presented by first solving the general problem of entanglement swapping between arbitrary bipartite Gaussian states, for which simple input-output formulas are provided.
Entanglement concentration for unknown atomic entangled states via entanglement swapping  [PDF]
Ming Yang,Yan Zhao,Wei Song,Zhuo-Liang Cao
Physics , 2004, DOI: 10.1103/PhysRevA.71.044302
Abstract: An entanglement concentration scheme for unknown atomic entanglement states is proposed via entanglement swapping in cavity QED. Because the interaction used here is a large-detuned one between two driven atoms and a quantized cavity mode, the effects of the cavity decay and thermal field have been eliminated. These advantages can warrant the experimental feasibility of the current scheme.
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