Photon-to-electron quantum information transfer
Photon-to-electron quantum information transfer
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DOI：
10.1117/12.872710
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发表时间：
2011-02
期刊：
影响因子：
--
通讯作者：
H. Kosaka
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文献类型：
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作者：
H. Kosaka
自旋是电子的基本性质，在信息存储中起着重要的作用。对于基于自旋的量子信息技术，电子自旋态的制备和读出必须是自旋相干的，但传统的自旋态制备和读出都是投射到上/下自旋态，而上/下自旋态不具有自旋相干。我们最近证明，光的偏振相干性可以相干地转移到半导体中电子的自旋相干性。我们还发展了一种新的方案，称为层析克尔旋转(TKR)，将传统的KR推广到直接读出光学制备的电子的自旋相干性，而不需要自旋动力学，从而允许在任意一组基态下进行自旋投影测量。这些演示是使用带有进动电子和非进动电子的g因子控制的半导体量子阱进行的。该方案为固体自旋量子态的制备和读出提供了一种与基团无关的工具。这些结果鼓励我们在半导体中实现飞行光子量子比特和静止电子自旋量子比特之间的量子介质转换器。
Spin is a fundamental property of electrons and plays an important role in information storage. For spin-based quantum information technology, preparation and read-out of the electron spin state must be spin coherent, but both the traditional preparation and read-out of the spin state are projective to up/down spin states, which do not have spin coherence. We have recently demonstrated that the polarization coherence of light can be coherently transferred to the spin coherence of electrons in a semiconductor. We have also developed a new scheme named tomographic Kerr rotation (TKR) by generalizing the traditional KR to directly read out the spin coherence of optically prepared electrons without the need for the spin dynamics, which allows the spin projection measurement in an arbitrary set of basis states. These demonstrations were performed using g-factor-controlled semiconductor quantum wells with precessing and non-precessing electrons. The developed scheme offers a tool for performing basis-independent preparation and read-out of a spin quantum state in a solid. These results encourage us to make a quantum media converter between flying photon qubits and stationary electron spin qubits in semiconductors.