Kapfinger Stephan, Reichert Thorsten, Lichtmannecker Stefan, Müller Kai, Finley Jonathan J, Wixforth Achim, Kaniber Michael, Krenner Hubert J
Lehrstuhl für Experimentalphysik 1 and Augsburg Centre for Innovative Technologies (ACIT), Universität Augsburg, Universitätsstrasse 1, 86159 Augsburg, Germany.
Nanosystems Initiative Munich (NIM), Schellingstrasse 4, 80799 München, Germany.
Nat Commun. 2015 Oct 5;6:8540. doi: 10.1038/ncomms9540.
Strongly confined photonic modes can couple to quantum emitters and mechanical excitations. To harness the full potential in quantum photonic circuits, interactions between different constituents have to be precisely and dynamically controlled. Here, a prototypical coupled element, a photonic molecule defined in a photonic crystal membrane, is controlled by a radio frequency surface acoustic wave. The sound wave is tailored to deliberately switch on and off the bond of the photonic molecule on sub-nanosecond timescales. In time-resolved experiments, the acousto-optically controllable coupling is directly observed as clear anticrossings between the two nanophotonic modes. The coupling strength is determined directly from the experimental data. Both the time dependence of the tuning and the inter-cavity coupling strength are found to be in excellent agreement with numerical calculations. The demonstrated mechanical technique can be directly applied for dynamic quantum gate operations in state-of-the-art-coupled nanophotonic, quantum cavity electrodynamic and optomechanical systems.
强受限光子模式可以与量子发射体和机械激发耦合。为了充分发挥量子光子电路的潜力，必须精确且动态地控制不同组件之间的相互作用。在此，一种典型的耦合元件，即光子晶体膜中定义的光子分子，由射频表面声波控制。对声波进行了定制，以便在亚纳秒时间尺度上有意地开启和关闭光子分子的键。在时间分辨实验中，直接观察到声光可控耦合表现为两种纳米光子模式之间清晰的反交叉。耦合强度直接由实验数据确定。发现调谐的时间依赖性和腔间耦合强度均与数值计算结果高度吻合。所展示的机械技术可直接应用于最先进的耦合纳米光子、量子腔电动力学和光机械系统中的动态量子门操作。
