Many-body spin rotation by adiabatic passage in spin-1/2 XXZ chains of ultracold atoms

Dimitrova, Ivana and Flannigan, Stuart and Lee, Yoo Kyung and Lin, Hanzhen and Amato-Grill, Jesse and Jepsen, Niklas and Cepaite, Ieva and Daley, Andrew J and Ketterle, Wolfgang (2023) Many-body spin rotation by adiabatic passage in spin-1/2 XXZ chains of ultracold atoms. Quantum Science and Technology, 8 (3). 035018. ISSN 2058-9565 (https://doi.org/10.1088/2058-9565/acd2fb)

[thumbnail of Dimitrova-etal-QST-2023-Many-body-spin-rotation-by-adiabatic-passage] Text. Filename: Dimitrova_etal_QST_2023_Many_body_spin_rotation_by_adiabatic_passage.pdf
Accepted Author Manuscript
Restricted to Repository staff only until 25 May 2024.
License: Strathprints license 1.0
Download (5MB) | Request a copy

Abstract

Quantum many-body phases offer unique properties and emergent phenomena, making them an active area of research. A promising approach for their experimental realization in model systems is to adiabatically follow the ground state of a quantum Hamiltonian from a product state of isolated particles to one that is strongly-correlated. Such protocols are relevant also more broadly in coherent quantum annealing and adiabatic quantum computing. Here we explore one such protocol in a system of ultracold atoms in an optical lattice. A fully magnetized state is connected to a correlated zero-magnetization state (an xy-ferromagnet) by a many-body spin rotation, realized by sweeping the detuning and power of a microwave field. The efficiency is characterized by applying a reverse sweep with a variable relative phase. We restore up to $50\%$ of the original magnetization independent of the relative phase, evidence for the formation of correlations. The protocol is limited by the many-body gap of the final state, which is inversely proportional to system size, and technical noise. Our experimental and theoretical studies highlight the potential and challenges for adiabatic preparation protocols to prepare many-body eigenstates of spin Hamiltonians.

CORE (COnnecting REpositories)