THESIS
2020
1 online resource (x, 30 pages) : iIllustrations (some color)
Abstract
The photon-atom interaction is an attractive and important research topic in quantum physics, with various novel physics phenomena and challenges. In this MPhil thesis, based on the Rubidium 85 cold atoms system, we employ the electromagnetically induced transparency (EIT) and slowlight effect to optimize the dephasing rate between two ground states of the atoms, which is a key parameter crucial to the practical applications in the future.
We first explore the theory about (EIT) and slowlight from the simplest case in a semi-classical way as well as the dephasing, and give the relation of EIT and slowlight with the dephasing. Then we present that the magnetic field counts significantly for the dephasing and propose methods to optimize it. We build a trap coil switch-off device and a bia...[
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The photon-atom interaction is an attractive and important research topic in quantum physics, with various novel physics phenomena and challenges. In this MPhil thesis, based on the Rubidium 85 cold atoms system, we employ the electromagnetically induced transparency (EIT) and slowlight effect to optimize the dephasing rate between two ground states of the atoms, which is a key parameter crucial to the practical applications in the future.
We first explore the theory about (EIT) and slowlight from the simplest case in a semi-classical way as well as the dephasing, and give the relation of EIT and slowlight with the dephasing. Then we present that the magnetic field counts significantly for the dephasing and propose methods to optimize it. We build a trap coil switch-off device and a bias coil to control the magnetic field near the atom vacuum cell and proves that these measures remarkably suppress the dephasing by comparing the slowlight results obtained before and after the optimization.
We believe that this work is helpful for further research targets like long time quantum memory and long correlation time biphoton generation for quantum network.
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