Staunstrup Mathias J R, Tiranov Alexey, Wang Ying, Scholz Sven, Wieck Andreas D, Ludwig Arne, Midolo Leonardo, Rotenberg Nir, Lodahl Peter, Le Jeannic Hanna
Center for Hybrid Quantum Networks (Hy-Q), Niels Bohr Institute, University of Copenhagen, DK-2100, Copenhagen Ø, Denmark.
Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany.
Nat Commun. 2024 Aug 31;15(1):7583. doi: 10.1038/s41467-024-51805-9.
Realizing a sensitive photon-number-dependent phase shift on a light beam is required both in classical and quantum photonics. It may lead to new applications for classical and quantum photonics machine learning or pave the way for realizing photon-photon gate operations. Nonlinear phase-shifts require efficient light-matter interaction, and recently quantum dots coupled to nanophotonic devices have enabled near-deterministic single-photon coupling. We experimentally realize an optical phase shift of 0.19π ± 0.03 radians ( ≈ 34 degrees) using a weak coherent state interacting with a single quantum dot in a planar nanophotonic waveguide. The phase shift is probed by interferometric measurements of the light scattered from the quantum dot in the waveguide. The process is nonlinear in power, the saturation at the single-photon level and compatible with scalable photonic integrated circuitry. The work may open new prospects for realizing high-efficiency optical switching or be applied for proof-of-concept quantum machine learning or quantum simulation demonstrations.
在经典光子学和量子光子学中，实现光束上依赖于光子数的灵敏相移都是必要的。这可能会为经典和量子光子学机器学习带来新应用，或者为实现光子 - 光子门操作铺平道路。非线性相移需要高效的光与物质相互作用，最近耦合到纳米光子器件的量子点实现了近乎确定性的单光子耦合。我们通过在平面纳米光子波导中使用弱相干态与单个量子点相互作用，实验实现了0.19π ± 0.03弧度（≈ 34度）的光学相移。通过对波导中量子点散射光的干涉测量来探测相移。该过程在功率上是非线性的，在单光子水平达到饱和，并且与可扩展的光子集成电路兼容。这项工作可能为实现高效光开关开辟新前景，或者应用于概念验证的量子机器学习或量子模拟演示。
