Quantum control with quantum Zeno effects

利用量子芝诺效应进行量子控制

• 批准号: 11650043
• 负责人: KITANO Masao
• 金额: $ 2.37万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650043/
• 关键词: Quantum Zeno effect; Optical pumping; decoherence; relaxation; デコヒーレンス; スピン; 量子制御

As a new method of quantum control, we proposed the use of the quantum Zeno effects and the anti Zeno effects. In these effects one can manipulate the motion of quantum systems with non-unitary processes such as observation and relaxation. In spite of the non-unitarity, the probability is conserved. The destruction of the coherence or the decoherence plays a crucial role. We can even create the coherence using the Zeno effect. As a testing system, we used the optical pumping system which has been conveniently utilized in quantum optical experiments. We found that in this familiar system the Zeno effect plays a very important role. It turned out that in the strong pumping limit the atomic polarization is maintained against the horizontal magnetic field owing to the Zeno effect rather than the population transfer via optical pumping. The Zeno effect induced by the optical pumping decoherence inhibits the Zeeman transition. It is verified experimentally that the light absorption decreases asymptotically to zero as the incident light intensity, increased.

作为一种新的量子控制方法，我们提出了利用量子芝诺效应和反芝诺效应。在这些效应中，人们可以用非单一过程操纵量子系统的运动，如观察和弛豫。尽管存在非一致性，但概率是守恒的。相干或退相干的破坏起着至关重要的作用。我们甚至可以用芝诺效应来创造连贯性。光泵浦系统作为测试系统，在量子光学实验中得到了很好的应用。我们发现，在这个熟悉的系统中，芝诺效应起着非常重要的作用。结果表明，在强泵浦极限下，原子极化是由于芝诺效应而不是通过光泵浦实现的人口转移而对水平磁场保持的。光抽运退相干引起的芝诺效应抑制了塞曼跃迁。实验证明，随着入射光强的增加，光吸收逐渐减小到零。

项目成果

M. Ktano: "Photon pairs and quantum correlation"Japanese Journal of Optics. 28 (9). 486-490 (1999)

M. Ktano：“光子对和量子关联”日本光学杂志。

M. Kitano, K. Yamane, and T. Ikushima: "Spin manipulation by absorption-free optical pumping"Phys. Rev.. A 59 (5). 3710-3713 (1999)

M. Kitano、K. Yamane 和 T. Ikushima：“通过无吸收光泵浦进行自旋操纵”Phys。

K. Yamane, M. Ito, and M. Kitano: "Quantum Zeno effect in optical fibers"Opt. Comm.. 192. 299-307 (2001)

K. Yamane、M. Ito 和 M. Kitano：“光纤中的量子芝诺效应”Opt。

K.Yamane: "Quantum Zeno effect, in optical fibers"Optics Communications. 192. 299-307 (2001)

K.Yamane：“光纤中的量子芝诺效应”光学通信。

北野正雄: "光子対と量子相関"光学. 28・9. 486-490 (1999)

北野正夫：“光子对和量子关联”光学28・90。