Quantum entanglement and disentanglement of multi-atom
systems
Quantum entanglement and disentanglement of multi-atom
systems
Zbigniew FICEK,
The National Centre
for Mathematics and Physics, KACST, P. O. Box 6086, Riyadh 11442,
Saudi Arabia;
Abstract ：We present a review of recent research on quantum entanglement, with special emphasis on entanglement between single atoms, processing of an encoded entanglement and its temporary evolution. Analysis based on the density matrix formalism are described. We give a simple description of the entangling procedure and explore the role of the environment in creation of entanglement and in disentanglement of atomic systems. A particular process we will focus on is spontaneous emission, usually recognized as an irreversible loss of information and entanglement encoded in the internal states of the system. We illustrate some certain circumstances where this irreversible process can in fact induce entanglement between separated systems. We also show how spontaneous emission reveals a competition between the Bell states of a two qubit system that leads to the recently discovered “sudden” features in the temporal evolution of entanglement. Another problem illustrated in details is a deterministic preparation of atoms and atomic ensembles in long-lived stationary squeezed states and entangled cluster states. We then determine how to trigger the evolution of the stable entanglement and also address the issue of a steered evolution of entanglement between desired pairs of qubits that can be achieved simply by varying the parameters of a given system.
Key words ：
entanglement
coherence
decoherence
spontaneous emission
squeezed states
cluster states
出版日期: 2010-03-05
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