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arXiv 1702.02759cond-mat.mes-hallquant-ph
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腔中单量子点激子量子比特动力学的相干控制

Coherent control of the dynamics of single quantum-dot exciton qubit in a cavity

Antonio de Freitas, L. Sanz, José M. Villas-Bôas

摘要:

在本工作中,我们从理论上证明了如何利用外激光场来控制纳米腔中单个量子点激子量子比特的布居数反转。采用Jaynes-Cummings模型描述系统,并利用Lindblad算子考虑非相干损耗。我们演示了如何在基态的激子和相干态的腔的叠加中制备初态。分析了激子-腔失谐量、激光-腔失谐量、脉冲面积和损耗对量子比特动力学的影响。我们还展示了如何使用与腔模共振的连续激光泵浦来维持腔内的相干态,从而为量子比特提供一些保护以防止腔损耗。

英文摘要:

In this work we demonstrate theoretically how to use external laser field to control the population inversion of a single quantum dot exciton qubit in a nanocavity. We consider the Jaynes-Cummings model to describe the system, and the incoherent losses were take into account by using Lindblad operators. We have demonstrated how to prepare the initial state in a superposition of the exciton in the ground state and the cavity in a coherent state. The effects of exciton-cavity detuning, the laser-cavity detunings, the pulse area and losses over the qubit dynamics are analyzed. We also show how to use a continuous laser pumping in resonance with the cavity mode to sustain a coherent state inside the cavity, providing some protection to the qubit against cavity loss.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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