Physics – Quantum Physics
Scientific paper
2003-09-19
Phys. Rev. A 69, 052317 (2004)
Physics
Quantum Physics
4 pages, 4 figures
Scientific paper
10.1103/PhysRevA.69.052317
We study the stability of entanglement in a quantum computer implementing an efficient quantum algorithm, which simulates a quantum chaotic dynamics. For this purpose, we perform a forward-backward evolution of an initial state in which two qubits are in a maximally entangled Bell state. If the dynamics is reversed after an evolution time $t_r$, there is an echo of the entanglement between these two qubits at time $t_e=2t_r$. Perturbations attenuate the pairwise entanglement echo and generate entanglement between these two qubits and the other qubits of the quantum computer.
Benenti Giuliano
Casati Giulio
Rossini Davide
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