Ken BrownNew paper out about single-shot quantum error correction with the toric code. Yingjia Lin, Shilin Huang, and me.
arxiv.org/abs/2310.16160 #QuantumErrorCorrection #DukeQuantumCenter
arxiv.org/abs/2310.16160 #QuantumErrorCorrection #DukeQuantumCenter
New ion trap quantum simulation paper on electron transfer and polarized light by Ke Sun et al. https://arxiv.org/abs/2304.12247 Collaboration between Jungsang Kim's lab, my lab, and David Beratan's group. #Quantum #DukeChemistry #DukeEngineering #DukeQuantumCenter
Quantum Simulation of Polarized Light-induced Electron Transfer with A Trapped-ion Qutrit System
Electron transfer within and between molecules is crucial in chemistry, biochemistry, and energy science. This study describes a quantum simulation method that explores the influence of light polarization on the electron transfer between two molecules. By implementing precise and coherent control among the quantum states of trapped atomic ions, we can induce quantum dynamics that mimic the electron transfer dynamics in molecules. We use $3$-level systems (qutrits), rather than traditional two-level systems (qubits) to enhance the simulation efficiency and realize high-fidelity simulations of electron transfer dynamics. We treat the quantum interference between the electron coupling pathways from a donor with two degenerate excited states to an acceptor and analyze the transfer efficiency. We also examine the potential error sources that enter the quantum simulations. The trapped ion systems have favorable scalings with system size compared to those of classical computers, promising access to electron-transfer simulations of increasing richness.
Dr. Zhubing Jia
successfully defended her Physics PhD thesis on Quantum Information Processing with Spin and Motional States of Trapped Ions. Gloria will next join the University of Illinois
as a postdoc with Prof. Jake Covey. Congratulations to Gloria! #DukeQuantumCenter #Quantum #PhDone
successfully defended her Physics PhD thesis on Quantum Information Processing with Spin and Motional States of Trapped Ions. Gloria will next join the University of Illinois
as a postdoc with Prof. Jake Covey. Congratulations to Gloria! #DukeQuantumCenter #Quantum #PhDone
Very excited for parallel arXiv posts with our friends in Australia on simulating conical intersections with trapped ions and observing the geometric phase on the ground state.
https://arxiv.org/abs/2211.07319
#DukeQuantumCenter
https://arxiv.org/abs/2211.07320
#SydneyScience
https://arxiv.org/abs/2211.07319
#DukeQuantumCenter
https://arxiv.org/abs/2211.07320
#SydneyScience
Simulating conical intersections with trapped ions
Conical intersections are common in molecular physics and photochemistry, and are often invoked to explain observed reaction products. A conical intersection can occur when an excited electronic potential energy surface intersects with the ground electronic potential energy surface in the coordinate space of the nuclear positions. Theory predicts that the conical intersection will result in a geometric phase for a wavepacket on the ground potential energy surface. Although conical intersections have been observed experimentally, the geometric phase has not been observed in a molecular system. Here we use a trapped atomic ion system to perform a quantum simulation of a conical intersection. The internal state of a trapped atomic ion serves as the electronic state and the motion of the atomic nuclei are encoded into the normal modes of motion of the ions. The simulated electronic potential is constructed by applying state-dependent forces to the ion with a near-resonant laser. We experimentally observe the geometric phase on the ground-state surface using adiabatic state preparation followed by motional state measurement. Our experiment shows the advantage of combining spin and motion degrees of freedom in a quantum simulator.