Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session N07: Quantum Control in Manybody Systems
8:00 AM–10:00 AM,
Thursday, June 6, 2024
Room: 203A
Chair: Jabir Chathanathil, Army Research Laboratory
Abstract: N07.00010 : Experimental Study of Universal Scaling in Super-radiant Quantum Phase Transitions with a Single Trapped Ion*
9:48 AM–10:00 AM
Presenter:
Hengchao Tu
(Tsinghua University)
Authors:
Hengchao Tu
(Tsinghua University)
Chunyang Luan
(Tsinghua University)
Zihan Yin
(Tsinghua University)
Menglin Zou
(Tsinghua University)
Myung-Joong Hwang
(Duke Kunshan University)
Kihwan Kim
(Tsinghua University)
Phase transitions typically manifest under thermodynamic conditions, where the emergence of a universal scaling function near a critical point serves as a pivotal sign of phase transition. Recently, the quantum Rabi model (QRM) has been highlighted for its ability to undergo quantum phase transitions from normal to super-radiant phases, with a simple system of a qubit and a harmonic oscillator mode [1,2]. QRM's order parameters can reveal universal scaling functions when approaching to the critical point, which, however, it has not been observed in experiment. Here we employ a single trapped ion to realize the QRM, and measure the order parameters of squeezing parameters and excitation of super-radiance and their corresponding universal scaling function. We speed up the process by optimizing the adiabatic evolution trajectories to overcome the limitation of coherence time of vibrational mode. This methodology offers a quantitative study of quantum phase transition and an avenue for exploring quantum sensing using QRM.
Reference:
[1] Myung-Joong Hwang, et al., Phys. Rev. Lett. 115, 180404 (2015).
[2] Ricardo Puebla, et al., Phys. Rev. Lett. 118, 073001 (2017).
*This work was supported by the Innovation Program for Quantum Science and Technology under grant no. 2021ZD0301602, and the National Natural Science Foundation of China under grant nos. 92065205, 11974200 and 62335013.
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