1. Large-scale photonic network with squeezed vacuum states for molecular vibronic spectroscopy.
- Author
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Zhu, Hui Hui, Sen Chen, Hao, Chen, Tian, Li, Yuan, Luo, Shao Bo, Karim, Muhammad Faeyz, Luo, Xian Shu, Gao, Feng, Li, Qiang, Cai, Hong, Chin, Lip Ket, Kwek, Leong Chuan, Nordén, Bengt, Zhang, Xiang Dong, and Liu, Ai Qun
- Subjects
SQUEEZED light ,MOLECULAR spectroscopy ,MOLECULAR spectra ,MICROPROCESSORS ,ANALYTICAL chemistry ,COHERENT states - 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. Proof-of-principle photonic quantum simulations of molecular vibronic spectra have been realised, but scalability to more complex systems is hindered by the difficulties in generating squeezed coherent states with multiple modes. Here, the authors demonstrate an alternative approach relying on vacuum-squeezed state. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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