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学术报告


5月21日Marko Lončar报告

发布时间:2018-05-20

报告时间:5月21日 周一  下午3:00

报告地实验室一楼会议室

报告人:Marko Lončar(哈佛大学教授)

报告题目: Towards a Quantum Cloud

报告摘要: Quantum science and technology promises realization of powerful computers and secure internet that together could lead to the development of unprecedented distributed quantum computational resource – a quantum cloud. While the exact implementation of quantum processing nodes and qubits to be used to achieve this are still the topic of intense research and debate, the information between the distant nodes will surely be carried by photons. For this reason, developing a reliable quantum interface between photons and different types of qubits is important. 

    Interfacing superconducting qubits at microwave frequencies with photons at telecommunication wavelengths is a good example. Among different conversion approaches considered (optomechanics, magnons, piezo-mechanics), the electro-optics (EO) approach is attractive since it is broadband, low noise, mechanically and thermally stable, scalable, and tunable. With its large EO coefficient (> 30 pm/V) and low microwave and optical loss, lithium-niobate (LN) is ideally suited for this task. I will summarize our work on ultra-low loss LN nanophotonic platform (waveguide losses < 0.03 dB/cm, optical quality factors ~ 10 million), and discuss how this integrated platform can be used to realize efficient microwave-to-optical photon conversion.

    Atomic-scale luminescent defects in diamond, including negatively charged nitrogen-vacancy (NV) and silicon-vacancy (SiV) color centers, have emerged as another promising solid-state platform for realization of integrated and distributed quantum networks. However, the performance of these atomic-like systems is affected by their interactions with the solid-state environment that they are embedded within. In my talk, I will review the advances in nanotechnology that allow for properties of diamond color centers to be engineered, as well as for realization of efficient photonic and phononic interfaces for diamond spin qubits.