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

Ivana Dimitrova, Stuart Flannigan, Yoo Kyung Lee, Hanzhen Lin, Jesse Amato-Grill, Niklas Jepsen, Ieva Cepaite, Andrew J Daley, Wolfgang Ketterle

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Article number035018
Number of pages19
JournalQuantum Science and Technology
Volume8
Issue number3
DOIs
Publication statusPublished - 25 May 2023

Keywords

  • quantum simulation
  • ultracold atoms in optical lattices
  • quantum spin Hamiltonian engineering
  • adiabatic state preparation
  • many-body states

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