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Quantum Entanglement Processing with Atoms |
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PP: 375-393 |
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Author(s) |
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Zbigniew Ficek,
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Abstract |
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| We discuss practical schemes for triggering evolution of entanglement between qubits.
The schemes are especially appealing as they require no experimentally difficult dynamical
control and addressing of individual atoms. It is shown that the evolution
of a stable or “frozen” entanglement can be triggered by varying the parameters of a
given system such as coupling constants between atoms and the field modes or detunings
between the atomic and field frequencies. We also address the issue of a controlled
(steered) evolution of entanglement between desired pairs of qubits that can be achieved
by varying the parameters of a given system. It is of practical importance to know if an
initial localized entanglement can be transferred on demand with the perfect fidelity to
a particular pair of qubits. In addition, we illustrate how one can achieve a controlled
creation of entanglement by spontaneous emission. We use two atoms that directly interact
through the dipole-dipole interaction and a collective spontaneous exchange of
photons. It is found that time at which an entanglement can be created depends on the
initial state of the atoms. |
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