Related papers: Observation of a Topological Berry Phase with a Single Phonon in an Ion Microtrap Array

Observation of a Topological Berry Phase with a Single Phonon in an Ion Microtrap Array

URL: http://arxiv.org/abs/2512.08037v2
Date: Sun, 14 Dec 2025 18:48:01 GMT
Title: Observation of a Topological Berry Phase with a Single Phonon in an Ion Microtrap Array
Authors: Justin F. Niedermeyer, Nathan K. Lysne, Katherine C. McCormick, Jonas Keller, Craig W. Hogle, Matthew G. Blain, Edwin J. Heller, Roman Schmied, Robert Jördens, Susanna L. Todaro, David J. Wineland, Andrew C. Wilson, Daniel H. Slichter, Dietrich Leibfried,
Abstract summary: Controlled quantum mechanical motion of trapped atomic ions can be used to simulate and explore collective quantum phenomena.<n>We show that a single motional quantum, or phonon, can be coherently shared among two or three ions.<n>Our results show that precise, individual quantum control of ion motion in a two-dimensional array can provide unique access to quantum multi-body effects.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Controlled quantum mechanical motion of trapped atomic ions can be used to simulate and explore collective quantum phenomena and to process quantum information. Groups of cold atomic ions in an externally applied trapping potential self-organize into "Coulomb crystals" due to their mutual electrostatic repulsion. The motion of the ions in these crystals is strongly coupled, and the eigenmodes of motion all involve multiple ions. While this enables studies of many-body physics, it limits the flexibility and tunability of the system as a quantum platform. Here, we demonstrate an array of trapped ions in individual trapping sites whose motional modes can be controllably coupled and decoupled by tuning the local applied confining potential for each ion. We show that a single motional quantum, or phonon, can be coherently shared among two or three ions confined at the vertices of an equilateral triangle 30 $μ$m on a side. We can adiabatically tune the ion participation in the motional modes around a closed contour in configuration space, observing that the single-phonon wavefunction acquires a topological Berry phase if the contour encircles a conical intersection of motional eigenvalue surfaces. We observe this phase by single-phonon interference and study its breakdown as the motional mode tuning becomes non-adiabiatic. Our results show that precise, individual quantum control of ion motion in a two-dimensional array can provide unique access to quantum multi-body effects.

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