Controllable Photonic Time-Bin Qubits from a Quantum Dot
Controllable Photonic Time-Bin Qubits from a Quantum Dot
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DOI：
10.1103/physrevx.8.021078
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发表时间：
2018-04
影响因子：
12.5
通讯作者：
J. P. Lee;J. P. Lee;L. Wells;L. Wells;B. Villa;B. Villa;S. Kalliakos;R. Stevenson;D. Ellis;I. Farrer;D. A. Ritchie;A. Bennett;A. Shields
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文献类型：
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作者：
J. P. Lee;J. P. Lee;L. Wells;L. Wells;B. Villa;B. Villa;S. Kalliakos;R. Stevenson;D. Ellis;I. Farrer;D. A. Ritchie;A. Bennett;A. Shields
光子时间仓量子比特非常适合通过光纤和波导电路传输。这些状态的形式为$\frac{1}{\sqrt{2}}（\alpha \ket{0} + e^{i\phi}\beta \ket{1}）$，其中$\ket{0}$和$\ket{1}$分别表示早期和晚期时间仓。通过控制激光驱动自旋翻转拉曼跃迁在一个单一的空穴充电的InAs量子点的相位，我们证明了完全控制的相位，$\phi$。我们表明，这个光子产生过程可以确定性地进行，只有适度的损失的一致性。最后，我们在不同能量的拉曼散射光中编码不同的量子比特，演示了单光子水平上的波分复用。
Photonic time bin qubits are well suited to transmission via optical fibres and waveguide circuits. The states take the form $\frac{1}{\sqrt{2}}(\alpha \ket{0} + e^{i\phi}\beta \ket{1})$, with $\ket{0}$ and $\ket{1}$ referring to the early and late time bin respectively. By controlling the phase of a laser driving a spin-flip Raman transition in a single-hole-charged InAs quantum dot we demonstrate complete control over the phase, $\phi$. We show that this photon generation process can be performed deterministically, with only a moderate loss in coherence. Finally, we encode different qubits in different energies of the Raman scattered light, demonstrating wavelength division multiplexing at the single photon level.