Müller Kai, Rundquist Armand, Fischer Kevin A, Sarmiento Tomas, Lagoudakis Konstantinos G, Kelaita Yousif A, Sánchez Muñoz Carlos, del Valle Elena, Laussy Fabrice P, Vučković Jelena
E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.
Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
Phys Rev Lett. 2015 Jun 12;114(23):233601. doi: 10.1103/PhysRevLett.114.233601. Epub 2015 Jun 8.
The on-chip generation of nonclassical states of light is a key requirement for future optical quantum hardware. In solid-state cavity quantum electrodynamics, such nonclassical light can be generated from self-assembled quantum dots strongly coupled to photonic crystal cavities. Their anharmonic strong light-matter interaction results in large optical nonlinearities at the single photon level, where the admission of a single photon into the cavity may enhance (photon tunneling) or diminish (photon blockade) the probability for a second photon to enter the cavity. Here, we demonstrate that detuning the cavity and quantum-dot resonances enables the generation of high-purity nonclassical light from strongly coupled systems. For specific detunings we show that not only the purity but also the efficiency of single-photon generation increases significantly, making high-quality single-photon generation by photon blockade possible with current state-of-the-art samples.
片上产生非经典光态是未来光量子硬件的关键要求。在固态腔量子电动力学中，这种非经典光可以从与光子晶体腔强耦合的自组装量子点中产生。它们的非谐强光 - 物质相互作用在单光子水平上导致大的光学非线性，其中单个光子进入腔中可能增强（光子隧穿）或降低（光子阻塞）第二个光子进入腔的概率。在这里，我们证明了失谐腔和量子点共振能够从强耦合系统中产生高纯度的非经典光。对于特定的失谐，我们表明不仅纯度而且单光子产生的效率都显著提高，使得利用当前最先进的样品通过光子阻塞实现高质量单光子产生成为可能。
