基于压缩的对称性破缺的声子热输运
Phonon heat transport with squeezing-based symmetry breaking
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中文总结 AI 辅助
研究声子热输运可控性问题，通过在腔光机械系统中引入量子压缩机制，打破相空间对称性，实现热流放大、减小及反转，超二十倍放大及30毫秒内反转热流，揭示热流反转与量子关联联系，为量子器件热管理开辟道路。
中文摘要 AI 辅助
声子热输运的可控性对众多技术至关重要，如冷却高性能芯片和管理量子计算中的热量。尽管付出诸多努力，但由于温度梯度的根本限制，按需实时控制声子热流仍难以实现。本文通过在腔光机械系统中引入利用量子压缩的新机制，实现了长期以来寻求的声子热输运。发现通过光机械诱导参量过程对近基态机械谐振器的声子压缩打破了相空间中的连续U(1)旋转对称性，进而打破了热流结构的对称性。揭示了在恒定温度梯度下热流可被确定性地放大、减小甚至反转，此前无法实现。利用声子压缩实现了热流超二十倍放大及在30毫秒内反转。重要的是，量子失协分析揭示了热流反转与量子关联的直接联系。结果表明量子压缩是按需声子热控制的通用平台，为量子器件和热逻辑电路中的主动热管理开辟了道路。
英文摘要
The controllability of phonon thermal transport is fundamental for numerous technologies, from cooling high-performance chips to managing heat in quantum computing. Despite extensive efforts, on-demand, real-time control of phonon heat flow remains elusive, being fundamentally constrained by the temperature gradient. Here we achieve this long-sought phonon heat transport by introducing a novel mechanism using quantum squeezing in a cavity optomechanical system. We find that phonon squeezing of near-ground-state mechanical resonators via an optomechanically induced parametric process breaks the continuous U(1) rotation symmetry in phase space, and consequently the symmetry in the heat current structure. We reveal that heat flow under a constant temperature gradient can be deterministically amplified, reduced, or even reversed, a capability previously unattainable. With phonon squeezing, we achieve over twentyfold amplification of heat flow and reversal within 30 milliseconds. Importantly, quantum discord analysis reveals a direct connection between heat flow reversal and quantum correlation. Our results establish quantum squeezing as a versatile platform for on-demand phononic thermal control, opening avenues for active heat management in quantum devices and thermal logic circuits.
