Nonclassical phonon pair

• URL: http://arxiv.org/abs/2509.24429v2
• Date: Tue, 30 Sep 2025 03:01:00 GMT
• Title: Nonclassical phonon pair
• Authors: Yu Wang, Zhen Shen, Mai Zhang, Zhi-Peng Shi, Hong-Yi Kuang, Shuai Wan, Fang-Wen Sun, Guang-Can Guo, Chun-Hua Dong,
• Abstract summary: We present a novel approach to generate quantum-correlated phonon pairs in a suspended silicon microstructure.<n>We demonstrate the nonclassical nature of the generated phonon pair through the violation of the Cauchy-Schwarz inequality.
• Score: 11.206601662751778
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum-correlated photon pairs are crucial resources for modern quantum information science. Similarly, the reliable generation of nonclassical phonon pairs is vital for advancing engineerable solid-state quantum devices and hybrid quantum networks based on phonons. Here, we present a novel approach to generate quantum-correlated phonon pairs in a suspended silicon microstructure initialized in its motional ground state. By simultaneously implementing red- and blue-detuned laser pulses, equivalent high-order optomechanical nonlinearity--specifically, an effective optomechanical four-wave mixing process--is achieved for generating a nonclassical phonon pair, which is then read out via a subsequent red-detuned pulse. We demonstrate the nonclassical nature of the generated phonon pair through the violation of the Cauchy-Schwarz inequality. Our experimentally observed phonon pair violates the classical bound by more than 5 standard deviations and maintains a decoherence time of 132 ns. This work reveals novel quantum manipulation of phonon states enabled by equivalent high-order optomechanical nonlinearity within a pulse scheme and provides a valuable quantum resource for mechanical quantum computing.

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