Fabel

Entanglement plays a crucial role in quantum information protocols, thus the dynamical behavior of entangled states is of a great importance. In this paper we suggest a useful scheme that permits a direct measure of entanglement in a two-qubit cavity system. It is realized in the cavity-QED technology utilizing atoms as flying qubits. To quantify entanglement we use the concurrence. We derive the conditions, which assure that the state remains entangled in spite of the interaction with the reservoir. The phenomenon of sudden death entanglement (ESD) in a bipartite system subjected to squeezed vacuum reservoir is examined. We show that the sudden death time of the entangled states depends on the initial preparation of the entangled state and the parameters of the squeezed vacuum reservoir.

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“…This kind of state can be prepared as we have mentioned in [56]. States like these have been realized in experiments with trapped ions [61].…”

Section: Results and Conclusionmentioning

confidence: 99%

Entanglement dynamics of a bipartite system in squeezed vacuum reservoirs

Bougouffa

Hindi

2011

Phys. Scr.

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“…, |ψ N 2 ψ N 2 | are experimentally prepared, and the output state E(|ψ j ψ j |) is measured for each input. This may be done, for example, by using quantum state tomography [12][13][14]. In principle, the quantum operation E can now be determined by a linear extension of E to all states.…”

Section: General Experimental Proceduresmentioning

confidence: 99%

Prescription for experimental determination of the dynamics of a quantum black box

Chuang

Nielsen

1997

Journal of Modern Optics

785

643

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We give an explicit prescription for experimentally determining the evolution operators which completely describe the dynamics of a quantum mechanical black box -an arbitrary open quantum system. We show necessary and sufficient conditions for this to be possible, and illustrate the general theory by considering specifically one and two quantum bit systems. These procedures may be useful in the comparative evaluation of experimental quantum measurement, communication, and computation systems.

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