Abstracte
The coupling between surface plasmon polaritons (SPPs) and quantum dots in one-dimensional periodic nanorod arrays has laid a theoretical foundation for single-qubit manipulation, yet mode crosstalk limits its scalability toward large-scale implementation. This paper extends the nanostructure from one-dimensional to two-dimensional configurations, investigating the spatial localization mechanism of SPPs in two-dimensional arrays and their parallel coupling characteristics with distributed quantum dot arrays. By establishing a two-dimensional periodic nanorod array model, the dispersion relations and bandgap structures along orthogonal directions are derived using Bloch’s theorem; the coupling strengths between SPPs and quantum dots at different lattice sites are obtained through field quantization; and the transition rates of quantum states at various positions are calculated based on Fermi’s golden rule, with crosstalk between adjacent unit cells analyzed. The results demonstrate that the two-dimensional array supports orthogonally propagating SPP modes, and proper geometric design enables effective localization within individual unit cells, significantly suppressing mode coupling between neighboring waveguides. Complete bandgaps emerge within specific frequency ranges, providing frequency windows for selective resonant coupling. The transition rates of quantum dots at different sites can be differentially controlled via excitation frequency, with inter-cell crosstalk negligible. Therefore, the two-dimensional periodic nanorod array effectively overcomes the scalability bottleneck of one-dimensional structures, offering a theoretical framework for large-scale addressable parallel quantum state manipulation, and holds application potential for integrated quantum information processing chips.
Biography
Zhang Xinhua has completed his PhD in Physics from the University of York, UK, studying surface plasmon and quantum states. As a postdoc at Zhejiang University (2016–2018), he focused on low-temperature plasma for medical and chemical applications. He has published widely and holds over 10 patents. His current research involves developing portable plasma devices for sterilization and coagulation.
