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arXiv 1903.01017quant-phcond-mat.mes-hallphysics.optics
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量子系统中无耗散的非厄米动力学

Non-Hermitian dynamics without dissipation in quantum systems

Yu-Xin Wang, A. A. Clerk

摘要:

基于非厄米哈密顿的模型可以展示出一系列令人惊讶的和潜在有用的现象。物理实现通常涉及与非相干增益和损耗源的耦合;这在量子设置中是有问题的,因为与这种耗散相关的不可避免的波动。在这里,我们提出了几种途径,获得无条件的非厄米动力学的非耗散量子系统。我们利用的事实,二次玻色子哈密顿不守恒粒子数产生非厄米动力学矩阵。我们讨论了这些映射的性质,从非厄米到厄米哈密顿,并探讨应用到量子传感,纠缠动力学和拓扑能带理论。我们讨论的系统可以实现在各种光子和声子的平台上使用无处不在的参数驱动资源。

英文摘要:

Models based on non-Hermitian Hamiltonians can exhibit a range of surprising and potentially useful phenomena. Physical realizations typically involve couplings to sources of incoherent gain and loss; this is problematic in quantum settings, because of the unavoidable fluctuations associated with this dissipation. Here, we present several routes for obtaining unconditional non-Hermitian dynamics in non-dissipative quantum systems. We exploit the fact that quadratic bosonic Hamiltonians that do not conserve particle number give rise to non-Hermitian dynamical matrices. We discuss the nature of these mappings from non-Hermitian to Hermitian Hamiltonians, and explore applications to quantum sensing, entanglement dynamics and topological band theory. The systems we discuss could be realized in a variety of photonic and phononic platforms using the ubiquitous resource of parametric driving.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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