Large-scale photonic network with squeezed vacuum states for molecular vibronic spectroscopy

Hui Hui Zhu, Hao Chen, Tian Chen (), Yuan Li, Shao Bo Luo, Muhammad Faeyz Karim, Xian Shu Luo, Feng Gao, Qiang Li, Hong Cai, Lip Ket Chin (), Leong Chuan Kwek (), Bengt Nordén (), Xiang Dong Zhang () and Ai Qun Liu ()
Additional contact information
Hui Hui Zhu: Nanyang Technological University
Hao 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: and Research)
Lip Ket Chin: City University of Hong Kong
Leong Chuan Kwek: Nanyang Technological University
Bengt Nordén: Chalmers University of Technology
Xiang Dong Zhang: Beijing Institute of Technology
Ai Qun Liu: Nanyang Technological University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract 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.

Date: 2024
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DOI: 10.1038/s41467-024-50060-2

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