报告题目：Probing quantum coherence in single-atom and molecular qubits using the ESR-STM technique

报告人：Research Professor Christoph Wolf

邀请人：张雪 教授

时间：2024年5月15日 10:00 - 11:00

地点：广州国际校区 C2a-207

欢迎广大师生踊跃参加。

自旋科技研究院

2024年5月8日

报告摘要：

The combination of electron spin resonance (ESR) and the scanning tunneling microscope yields a technique with unprecedented spatial (~Å) and energy (~μeV) resolution. [1] In recent years, this has enabled the study of quantum-coherent phenomena of individual atoms and molecules on surfaces. Only very recent, we were able to show that this platform enables the bottom-up construction of nano-structures with quantum-coherent functionality – which, in principle, could be used to simulate complex quantum systems in hardware. [2]

In this talk, I want to give an overview over the recent discoveries of quantum-coherent phenomena in atoms, molecules and artificial nanostructures based on the ESR-STM technique and non-equilibrium transport simulation.[3] I want to explore the limits of entanglement[4] and the opportunities of these systems with an outlook on their application as novel platform for the study of many-body quantum physics.

Figure 1: Entanglement detection in an ESR-STM: the entanglement of two spin qubits (A, B) can be detected via a third, non-coherent, sensor spin (S). The time evolution of the entangled state is mapped back onto the population of one spin using phase-reversal tomography as indicated by the X(φ) gate.

[1] Baumann et al., Science 350, 417-420 (2015)

[2] Wang et al., Science 382, 87-92 (2023)

[3] Reina et al., Physical Review B 107, 235404 (2023)

[4] Broekhoeven et al., NPJ QI (under review), arXiv:2401.15017

报告人简介：

Christoph Wolf, Research Professor at EWHA WOMANS University, Group Leader Theory of Quantum Systems at Surfaces at Center for Quantum Nanoscience.

I joined QNS in fall of 2017 as a post-doc after obtaining my PhD from POSTECH University earlier that year. My work focuses on computational modeling of quantum coherent properties of localized electron spins on and near surfaces. Since September of 2020 I lead my own research group called Theory of Quantum Systems at Surfaces in QNS. Together with my team I focus on the development of predictive methods for the discovery, optimization, and control of quantum-coherent spin systems. My research interests include: 1) Open quantum systems simulations; 2) Non-equilibrium quantum transport; 3) Ab initio and ab initio-based methods.