Robust decoding of quantum orders in NISQ devices
Abstract: Observations and applications of quantum mechanical phenomena at a macroscopic scale are among the most important goals shared between quantum information science (QIS) and condensed matter physics (CMP). In this talk, I will describe how recent dialogues between QIS and CMP resulted in a novel approach to this goal: an efficient protocol to prepare a large scale quantum many-body state with useful quantum entanglement in noisy quantum devices. This is particularly important in the noisy intermediate-scale quantum era, where decoherence poses a major challenge. The key idea is to synergistically combine multiple ingredients from CMP, QIS, and computation: the robustness of phases of matter, quantum teleportation induced by projective measurements, and computationally assisted feedback control. As a concrete example, I will present how to efficiently and robustly prepare long-range entangled states in a shallow quantum circuit in the presence of imperfections and noises. Taking further steps, I will provide a new perspective to understand the robustness of “useful” quantum entanglement against non-unitary dynamics, which will lead to a fundamental understanding of what can be verified in the NISQ platforms.
Bio: Jong Yeon Lee is a Moore postdoctoral fellow at the Kavli Institute for Theoretical Physics in Santa Barbara. His research interests span a wide range of topics from quantum many-body physics and quantum information science, with a focus on implementing and utilizing macroscopic quantum mechanical phenomena in experimental platforms. He earned his undergraduate degrees in Physics and Mathematics from the California Institute of Technology, where he received the Richard P. Feynman Prize. He completed his Ph.D. under the guidance of Professor Ashvin Vishwanath at Harvard University and was recently honored with the 2022 Outstanding Young Researcher Award from the Association of Korean Physicists in America.
