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A University of Minnesota Twin Cities-led research team studied how bacteria swim in complex fluids, providing insight into how the microorganisms move through different environments, such as their natural habitats or inside the human body. Photo credit: Cheng Research Group, University of Minnesota.
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An Optical System Defies Conventional Band Theory
June 10, 2021•
Physics 14, s70
Squeezed wave functions reshape an open quantum system’s bulk-boundary properties and generate a new class of parity-time symmetry.
L. Xiao
L. Xiao
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Quantum systems that obey parity-time symmetry exhibit “exceptional points” within their parameter space. In quantum optical systems, these are points where a light beam’s energy gains and losses are perfectly balanced, leading to rich critical phenomena, such as extreme sensitivity to external parameters. Parity-time symmetry can be engineered into systems via designs that ensure a balance of inward and outward energy flows (see Viewpoint:
PT Symmetry Goes Quantum). Now, Lei Xiao, at Beijing Computational Science Research Center, and colleagues demonstrate a new way to produce both parity-time symmetry and exceptional points in a quantum-optical circuit. Their study could allow tools for tuning exotic behavior in photonic, phon