Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093.
Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093.
Proc Natl Acad Sci U S A. 2023 Jan 3;120(1):e2206062120. doi: 10.1073/pnas.2206062120. Epub 2022 Dec 27.
In this study, the "particle in a box" idea, which was broadly developed in semiconductor quantum dot research, was extended into mid-infrared (IR) cavity modes by applying lateral confinement in an optical cavity. The discrete cavity modes hybridized with molecular vibrational modes, resulting in a quartet of polariton states that can support multiple coherence states in the IR regime. We applied tailored pump pulse sequences to selectively prepare these coherences and verified the multi-coherence existence. The simulation based on Lindblad equation showed that because the quartet of polariton states resided in the same cavity, they were specifically robust toward decoherence caused by fluctuations in space. The multiple robust coherences paved the way for entangled states and coherent interactions between cavity polaritons, which would be critical for advancing polariton-based quantum information technology.
在这项研究中，通过在光学腔中施加横向限制，将“盒子中的粒子”这一概念从半导体量子点研究中广泛推广到中红外（IR）腔模式。离散腔模与分子振动模杂交，产生了四重极化激元态，可在 IR 区域支持多个相干态。我们应用定制的泵浦脉冲序列来选择性地制备这些相干态，并验证了多相干态的存在。基于 Lindblad 方程的模拟表明，由于四重极化激元态位于同一腔中，因此它们对由于空间波动引起的退相干特别稳健。这些多重稳健相干态为腔极化激元的纠缠态和相干相互作用铺平了道路，这对于推进基于极化激元的量子信息技术至关重要。
