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Symposium on Photonics and Optoelectronics

Coherent and Ultrafast Manipulation of Entanglement Sudden Death and Revival

Xiangyang Yu, Jianhong Li

Published Jun 1, 2010• 0 citations
Publisher

Abstract

Within the framework of semi-classical theory of light and matter, we investigate the entanglement dynamics of the bipartite system consisting of two identical and interacting two-level atoms in QED by use of concurrence, which are driven by coherent double ultra-short laser pulses divided by diverse phase differences. Results show that under different detuning, the phase difference can exert significant influence on the entanglement evolution, such as delaying or accelerating entanglement sudden death (ESB) and revival (ESR). Furthermore, with the increment of detuning, ESD and ESR disappear irrespective of various phase differences.

DOI
10.1109/sopo.2010.5504294

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Within the framework of semi-classical theory of light and matter, we investigate the entanglement dynamics of the bipartite system consisting of two identical and interacting two-level atoms in QED by use of concurrence, which are driven by coherent double ultra-short laser pulses divided by diverse phase differences. Results show that under different detuning, the phase difference can exert significant influence on the entanglement evolution, such as delaying or accelerating entanglement sudden death (ESB) and revival (ESR). Furthermore, with the increment of detuning, ESD and ESR disappear irrespective of various phase differences.
We investigate the entanglement dynamics of the bipartite system, consisting of two interacting two-level atoms in QED, which are driven additionally by coherent double ultrashort laser pulses characterized by various phase differences. Results show that the relative phase difference can exert significant influence on the entanglement evolution, such as delaying or accelerating entanglement sudden death and recurrence (ESD and ESR). Furthermore, with the increase of detuning, ESD and ESR disappear, irrespective of various phase differences. Our analysis is helpful in manipulating entanglement.
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Within the framework of semi-classical theory of light and matter, we investigate the entanglement dynamics of the bipartite system consisting of two identical and interacting two-level atoms by means of concurrence, which are coupled to the common reservoir and driven by external time-dependent laser field. Numerical results reveal that for these initially entangled states, the bipartite system undergoes entanglement sudden death (ESD) and birth (ESB), and stable entanglement always occur irrespective of dissipation. Besides, the coupling strength of the electric dipole-dipole will have remarkable effects on the entanglement dynamics, like accelerating the ESD and ESB. However, these conclusions are not applicable to other initially entangled states.
Starting from famous Schrödinger equation within the framework of semi-classical theory of light-matter interaction, we firstly obtain the analytical non-resonant solutions of the driven bipartite system's entanglement dynamics in independent and coherent double pathways. Numerical simulations show that under non-resonant condition, entanglement sudden death and revival between these transition patterns behave quite differently, indicating the utmost importance of transition pathways' interference. Furthermore, the laser pulse's area and detuning exert significant but quite distinct influences on the entanglement dynamics. Our analyses are helpful in manipulating entanglement in current experimental technology.
We investigate the entanglement dynamics of two two-level atoms interacting with two vacuum fields of two spatially separated cavities with the Stark effects by employing the concurrence. It is shown that the entanglement sudden death (ESD) and birth (ESB) could be controlled by adjusting the Stark-shift parameters. If the Stark-shift parameters are chosen appropriately, then ESD and ESB phenomena will appear. In addition, the appearance of ESD before or after ESB depends on the Stark-shift values.
We investigate the entanglement dynamics of two interacting qubits in a common vacuum environment. The inevitable environment interaction leads to entanglement sudden death (ESD) in a two qubit entangled state system. The entanglement dynamics can be modified by the use of local unitary operations (quantum gates), applied on the system during its evolution. We show that these operations not only delays or avoids the ESD but also advances the entanglement revival with high concurrence value depending on the time of operation. We have analytically found out different time windows for switching with different quantum gates so that the ESD can be completely avoided in the subsequent evolution of the system. Our result offers practical applications in the field of quantum information processing where the entanglement is a necessary resource.