Large-scale photonic network with squeezed vacuum states for molecular vibronic spectroscopy
Journal article, 2024
Although molecular vibronic spectra generation is pivotal for chemical analysis, tackling such exponentially complex tasks on classical computers remains inefficient. Quantum simulation, though theoretically promising, faces technological challenges in experimentally extracting vibronic spectra for molecules with multiple modes. Here, we propose a nontrivial algorithm to generate the vibronic spectra using states with zero displacements (squeezed vacuum states) coupled to a linear optical network, offering ease of experimental implementation. We also fabricate an integrated quantum photonic microprocessor chip as a versatile simulation platform containing 16 modes of single-mode squeezed vacuum states and a fully programmable interferometer network. Molecular vibronic spectra of formic acid and thymine under the Condon approximation are simulated using the quantum microprocessor chip with high reconstructed fidelity (> 92%). Furthermore, vibronic spectra of naphthalene, phenanthrene, and benzene under the non-Condon approximation are also experimentally simulated. Such demonstrations could pave the way for solving complicated quantum chemistry problems involving vibronic spectra and computational tasks beyond the reach of classical computers.
Author
Hui Hui Zhu
Nanyang Technological University
Hao Sen Chen
Beijing Institute of Technology
Tian Chen
Beijing Institute of Technology
Yuan Li
Nanyang Technological University
Shao Bo Luo
Southern University of Science and Technology
Muhammad Faeyz Karim
Nanyang Technological University
Xian Shu Luo
Advanced Micro Foundry
Feng Gao
Advanced Micro Foundry
Qiang Li
Advanced Micro Foundry
Hong Cai
A*STAR - Agency for Science, Technology and Research
Lip Ket Chin
City University of Hong Kong
L. C. Kwek
Nanyang Technological University
Centre for Quantum Technologies
Bengt Nordén
Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry
Xiang Dong Zhang
Beijing Institute of Technology
Ai Qun Liu
Nanyang Technological University
Hong Kong Polytechnic University
Nature Communications
2041-1723 (ISSN) 20411723 (eISSN)
Vol. 15 1 6057Subject Categories
Atom and Molecular Physics and Optics
Theoretical Chemistry
DOI
10.1038/s41467-024-50060-2
PubMed
39025843