通过实验Kraus-map控制的全光输入不可知偏振Transformer
All-optical input-agnostic polarization transformer via experimental Kraus-map control
摘要：
光的偏振在整个科学和工程的许多技术中被利用。将一种偏振状态转换为另一种偏振状态的能力是一项关键的使能技术。常见的偏振Transformers是简单的偏振器和偏振旋转器。简单的偏振器根据输入状态改变强度并且只能输出固定的偏振状态，而偏振旋转器在3D Stokes空间中旋转输入Stokes矢量。我们实验证明了一个全光输入不可知的偏振Transformer（AI-APT），它将所有的偏振输入状态转换为一个特定的状态，可以被偏振或部分偏振。偏振和强度的输出状态仅取决于设置参数，而不取决于输入状态，因此AI-APT的功能不同于简单的偏振器和偏振旋转器。AI-APT是完全无源的，因此可以用作单光子和超快脉冲的偏振控制器或稳定器。为了实现这一点，我们第一次通过在[Wu et al.J.Phys.A40，5681（2007）]中提出的Kraus映射实验性地实现了开放单量子比特的完全运动学状态可控性。AI-APT可能会开辟部分偏振超快光学的新前沿。
英文摘要：
The polarization of light is utilized in many technologies throughout science and engineering. The ability to transform one state of polarization to another is a key enabling technology. Common polarization transformers are simple polarizers and polarization rotators. Simple polarizers change the intensity depending on the input state and can only output a fixed polarized state, while polarization rotators rotates the input Stokes vector in the 3D Stokes space. We experimentally demonstrate an all-optical input-agnostic polarization transformer (AI-APT), which transforms all input states of polarization to a particular state that can be polarized or partially polarized. The output state of polarization and intensity depends solely on setup parameters, and not on the input state, thereby the AI-APT functions differently from simple polarizers and polarization rotators. The AI-APT is completely passive, and thus can be used as a polarization controller or stabilizer for single photons and ultrafast pulses. To achieve this, we, for the first time, experimentally realize complete kinematic state controllability of an open single-qubit by Kraus maps put forth in [Wu et al. J. Phys. A 40, 5681 (2007)]. The AI-APT may open a new frontier of partially polarized ultrafast optics.
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