Quantum interference induced photon blockade in a coupled single quantum dot-cavity system.
Quantum interference induced photon blockade in a coupled single quantum dot-cavity system.
复制标题
耦合单量子点腔系统中的量子干涉诱导光子阻挡
DOI：
10.1038/srep09252
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发表时间：
2015-03-18
影响因子：
4.6
通讯作者：
Xu X
中科院分区：
文献类型：
--
作者：
Tang J;Geng W;Xu X
我们提出了一种利用单量子点耦合纳米腔实现强光子封锁的实验方案。用两个经典激光场同时驱动空腔和量子点，可以极大地增强光子封锁效应。这种增强的光子封锁归因于量子干涉效应，以避免双光子激发腔场。与Jaynes-Cummings模型相比，该方案的二阶相关函数在零时延g(2)(0)处可以减小两个数量级，且系统保持较大的腔内光子数。具有聚束或反聚束特性的光子量子统计的红（蓝）腔光失谐不对称性也被观察到。通过调节两个泵浦激光场之间的相对相位和量子点与泵浦场之间的拉比耦合强度，光子封锁效应具有可控的灵活性。此外，基于量子干涉机制的光子封锁方案不需要腔和量子点之间有很强的耦合强度，即使系统是纯脱相的。这一简单的建议为在固态量子计算和量子信息处理方面的潜在应用提供了有效的途径。
We propose an experimental scheme to implement a strong photon blockade with a single quantum dot coupled to a nanocavity. The photon blockade effect can be tremendously enhanced by driving the cavity and the quantum dot simultaneously with two classical laser fields. This enhancement of photon blockade is ascribed to the quantum interference effect to avoid two-photon excitation of the cavity field. Comparing with Jaynes-Cummings model, the second-order correlation function at zero time delay g(2)(0) in our scheme can be reduced by two orders of magnitude and the system sustains a large intracavity photon number. A red (blue) cavity-light detuning asymmetry for photon quantum statistics with bunching or antibunching characteristics is also observed. The photon blockade effect has a controllable flexibility by tuning the relative phase between the two pumping laser fields and the Rabi coupling strength between the quantum dot and the pumping field. Moreover, the photon blockade scheme based on quantum interference mechanism does not require a strong coupling strength between the cavity and the quantum dot, even with the pure dephasing of the system. This simple proposal provides an effective way for potential applications in solid state quantum computation and quantum information processing.
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影响因子：
8.6
作者：
Deng, Y.;Cheng, J.;Yi, S.
通讯作者：
Yi, S.
影响因子：
64.8
作者：
Birnbaum, KM;Boca, A;Kimble, HJ
通讯作者：
Kimble, HJ
影响因子：
8.6
作者：
Imamoglu, A;Schmidt, H;Deutsch, M
通讯作者：
Deutsch, M
影响因子：
35
作者：
Ates, S.;Ulrich, S. M.;Michler, P.
通讯作者：
Michler, P.
影响因子：
64.8
作者：
Knill, E;Laflamme, R;Milburn, GJ
通讯作者：
Milburn, GJ