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arXiv 1505.04239physics.opticsquant-ph
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光子自旋霍尔效应的修正弱测量

Modified weak measurements for detecting photonic spin Hall effect

Shizhen Chen, Xinxing Zhou, Chengquan Mi, Hailu Luo, Shuangchun Wen

摘要:

弱测量是探测光子自旋霍尔效应中自旋相关微小分裂的重要技术。弱测量只有在探测波函数在测量过程中几乎不受干扰时才有效。然而,在某些实际情况下,如强耦合区或预选态和后选态几乎正交时,它并不总是满足这样的条件。本文发展了一种改进的弱测量方法,用于探测波函数畸变时的光子自旋霍尔效应。我们发现,测量程序与预选和后选择合奏仍然是有效的。在弱测量和强测量都不能探测到自旋相关分裂的情况下,该方案对于我们探测光子自旋霍尔效应具有重要意义。修正后的理论不仅在弱耦合区有效,而且在强耦合区也有效,特别是在中间区。建立了常规弱测量和修正弱测量的理论模型,并进行了比较。我们表明,实验结果与修正理论的预测吻合得很好。

英文摘要:

Weak measurement is an important technique for detecting the tiny spin-dependent splitting in photonic spin Hall effect. The weak measurement is only valid when the probe wavefunction remains almost undisturbed during the procedure of measurements. However, it does not always satisfy such condition in some practical situations, such as in the strong-coupling regime or the preselected and postselected states are nearly orthogonal. In this paper, we develop a modified weak measurement for detecting photonic spin Hall effect when the probe wavefunction is distorted. We find that the measuring procedure with preselected and postselected ensembles is still effective. This scheme is important for us to detect the photonic spin Hall effect in the case where neither weak nor strong measurements can detect the spin-dependent splitting. The modified theory is valid not only in weak-coupling regime but also in the strong-coupling regime, and especially in the intermediate regime. The theoretical models of conventional weak measurements and modified weak measurements are established and compared. We show that the experimental results coincide well with the predictions of the modified theory.

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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