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12 May 2006 Collapse and revival of entanglement of two interacting qubits
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Abstract
Coherent control of quantum dynamics by phase-manipulation of the driving fields, has long been established as an essential tool for state-selective preparation of systems. On the other hand, the basic manipulations of qubits in most physical realizations of quantum-computation devices use Rabi pulses that operate on the Bloch sphere, particularly for weakly-coupled, slow-decoherent systems. In this work we analyze the role of phase-control and phase-dependence of Rabi pulses that prepare Bell states in a system of distinguishable qubits interacting in a harmonic trap. We show that the population dynamics and the properties of the entanglement exhibit a strong dependence to the relative phase. For coherent phonon distributions, collapse and full revival of entanglement occur, while for thermal distributions, except for a few "protected" phases, decoherence with partial revivals are observed.
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Vladimir S. Malinovsky and Ignacio R. Sola "Collapse and revival of entanglement of two interacting qubits", Proc. SPIE 6244, Quantum Information and Computation IV, 62440D (12 May 2006); https://doi.org/10.1117/12.666761
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