2018/03/09 by Jun Ren, Tian Chen, Xiangdong Zhang
Computer Science · Materials Science · Physics and Astronomy · #Coupling (piping) #Gold and Silver Nanoparticles Synthesis and Applications #Plasmon #Quantum #Quantum Computing Algorithms and Architecture #Quantum algorithm #Quantum computer #Quantum process #Spectroscopy and Quantum Chemical Studies #Speedup #physics.optics
paper · pdf · doi:10.1088/1367-2630/ab1edc
arxiv created 2018/03/09 · openalex created_date 2018/03/29 · openalex publication_date 2019/05/01 · arxiv updated 2019/05/22 · openalex updated_date 2026/08/05
Abstract Long-lived quantum speedup serves as a fundamental component for quantum algorithms. The quantum walk is identified as an ideal scheme to realize the long-lived quantum speedup. However, one finds that the duration of quantum speedup is too short in real systems to implement the quantum algorithms, for instance the speedup in the photosynthetic light-harvesting systems can last only dozens of femtoseconds. Here, we construct one plasmonic system with two-level molecules embodied in the hot spots of one-dimensional nanoparticle chains to realize the long-lived quantum speedup. The coherent and incoherent coupling parameters in the system are obtained by means of Green’s tensor technique. Our results reveal that the duration of quantum speedup in our scheme can exceed 500 fs under strong coherent coupling conditions. Moreover, our plasmonic system has far prospect in realizing high-dimensional quantum walk, which is very beneficial for quantum algorithms.