Engineering directed excitonic energy transfer

Long-range transport of 2D excitons with acoustic waves

Excitons are elementary optical excitation in semiconductors. The ability to manipulate and transport these quasiparticles would enable excitonic circuits and devices for quantum photonic technologies. Recently, interlayer excitons in 2D semiconductors have emerged as a promising candidate for engineering excitonic devices due to their long lifetime, large exciton binding energy, and gate tunability. However, the charge-neutral nature of the excitons leads to weak response to the in-plane electric field and thus inhibits transport beyond the diffusion length. Here, we demonstrate the direction…

Ultrafast Control of Excitonic Rashba Fine Structure by Phonon Coherences in a Metal Halide Perovskite CH$_3$NH$_3$PbI$_3$

We discover hidden Rashba fine structure in CH$_3$NH$_3$PbI$_3$ and demonstrate its quantum control by vibrational coherence through symmetry-selective vibronic (electron-phonon) coupling. Above a critical threshold of a single-cycle terahertz pump field, a Raman phonon mode distinctly modulates the middle excitonic states with {\em persistent} coherence for more than ten times longer than the ones on two sides that predominately couple to infrared phonons. These vibronic quantum beats, together with first-principles modeling of phonon periodically modulated Rashba parameters, identify a {\em …

Interplay between Dephasing and Geometry and Directed Heat Flow in Exciton Transfer Complexes

The striking efficiency of energy transfer in natural photosynthetic systems and the recent evidence of long-lived quantum coherence in biological light harvesting complexes has triggered much excitement, due to the evocative possibility that these systems - essential to practically all life on earth -- use quantum mechanical effects to achieve optimal functionality. A large body of theoretical work has addressed the role of local environments in determining the transport properties of excitons in photosynthetic networks and the survival of quantum coherence in a classical environment. Nonethe…

Decoherence control by quantum decoherence itself

We propose a general approach of protecting a two-level system against decoherence via quantum engineering of non-classical multiple superpositions of coherent states in a non-Markovian reservoir. The scheme surprisingly only uses the system-environment interaction responsible for the decoherence and projective measurements of the two-level system. We demonstrate the method on the example of an excitonic qubit in self-assembled semiconductor quantum dots coupled to super-Ohmic reservoir of acoustic phonons.

具有多供体架构的广义量子光电池中的光电流增强

Engineering Quantum Photocells through Donor Multiplicity: Scaling Photocurrent and Power with N-Donor Architectures

提出受生物捕光启发的N供体广义量子光电池模型，通过量子热机建模与Born-Markov主方程分析，证明供体增加可带来光电流和输出功率的超线性增强。

通过色氨酸网络模拟和紫外光谱工程微管的量子光学响应

Engineering quantum optical responses of microtubules through tryptophan-network simulations and ultraviolet spectroscopy

研究通过结合激子辐射耦合模型和分子动力学衍生的微管类组装，探讨通过色氨酸网络调控微管光学响应的可能性，实验支持了聚合和添加色氨酸对量子产率的影响。

在大规模量子处理器中观测反馈引导的量子动力学

Observation of feedback-directed quantum dynamics in large-scale quantum processors

研究通过反馈引导电路架构实现对随机动力学的操控，利用量子处理器进行大规模模拟，发现反馈诱导的不对称性，为非单位ary控制提供新方法。