3,279 research outputs found
Entanglement concentration for unknown atomic entangled states via entanglement swapping
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.Comment: 4 page
Generating multi-atom entangled W states via light-matter interface based fusion mechanism
W state is a key resource in quantum communication. Fusion technology has
been proven to be a good candidate for preparing a large-size W state from two
or more small-size W states in linear optical system. It is of great importance
to study how to fuse W states via light-matter interface. Here we show that it
is possible to prepare large-size W-state networks using a fusion mechanism in
cavity QED system. The detuned interaction between three atoms and a vacuum
cavity mode constitute the main fusion mechanism, based on which two or three
small-size atomic W states can be fused into a larger-size W state. If no
excitation is detected from those three atoms, the remaining atoms are still in
the product of two or three new W states, which can be re-fused. The
complicated Fredkin gate used in the previous fusion schemes is avoided here. W
states of size 2 can be fused as well. The feasibility analysis shows that our
fusion processes maybe implementable with the current technology. Our results
demonstrate how the light-matter interaction based fusion mechanism can be
realized, and may become the starting point for the fusion of multipartite
entanglement in cavity QED system.Comment: 9 pages, 2 figure
Common Fixed Point for Self-Mappings Satisfying an Implicit Lipschitz-Type Condition in Kaleva-Seikkala's Type Fuzzy Metric Spaces
We first introduce the new real function class ℱ satisfying an implicit Lipschitz-type condition. Then, by using ℱ-type real functions, some common fixed point theorems for a pair of self-mappings satisfying an implicit Lipschitz-type condition in fuzzy metric spaces (in the sense of Kaleva and Seikkala) are established. As applications, we obtain the corresponding common fixed point theorems in metric spaces. Also, some examples are given, which show that there exist mappings which satisfy the conditions in this paper but cannot satisfy the general contractive type conditions
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