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首页> 外文会议>International conference on laser physics 2010 >Photonic time-bin qubit generation with a tripod atomic system
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Photonic time-bin qubit generation with a tripod atomic system

机译：具有三脚架原子系统的光子时间bin量子位生成

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摘要

A new method of preparing a single photon in temporally delocalized entangled modes is proposed and analyzed. We show that in a medium of four-level atoms with tripod-level configuration a strong parametric interaction between two one-photon pulses emerges, if the medium was initially prepared in a coherent superposition of the two ground states, while a strong classical field drives the neighbor transition from the third ground state. The analytical solution of Maxwell equations reveals that under the electromagnetically induced transparency (EIT), the quantum fields propagate with significantly small absorption and with different group velocities that leads to their temporal split into well-separated pulses, the amplitudes of which are well controlled by the driving field. The proposed scheme can serve as a robust source of narrow-band one-photon qubits with an entanglement between two temporal modes, not sensitive to losses in atmosphere and in telecommunication waveguides. We show also that in our scheme a controllable degree of temporal entanglement can be achieved.
机译：提出并分析了一种以时间离域纠缠模式制备单光子的新方法。我们表明，在具有三脚架结构的四能级原子介质中，如果最初以两个基态的相干叠加制备介质，则会出现两个单光子脉冲之间的强参数相互作用。邻居从第三基态过渡。麦克斯韦方程组的解析解表明，在电磁感应透明性（EIT）下，量子场以明显小的吸收和不同的群速度传播，从而导致它们在时间上分裂成分离良好的脉冲，其振幅受到很好的控制。驱动领域。所提出的方案可以用作窄带单光子量子位的稳健源，在两个时间模式之间具有纠缠关系，对大气和电信波导的损耗不敏感。我们还表明，在我们的方案中，可以实现可控程度的时间纠缠。

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