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

Hui Hui Zhu, Hao Sen 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, Ai Qun Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

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.

Original languageEnglish
Article number6057
JournalNature Communications
Volume15
Issue number1
DOIs
Publication statusPublished - 18 Jul 2024

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry,Genetics and Molecular Biology
  • General Physics and Astronomy

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