Today’s most advanced ion trap quantum computers have at most one qubit per ion, each defined within the ground state manifold. Additional non-qubit ions provide sympathetic cooling to keep the computational ions cold enough to perform many rounds of high-fidelity coherent operations. Typically, the two subsets of ions must be different species to prevent cooling light from disturbing the computation. To bypass this added system complexity, we can instead promote our computational ions to a long-lived excited state that is isolated from the ground-state cooling transitions. This promotion also enables new features including erasure conversion and projective state preparation and cooling. We will discuss two recent efforts to develop this architecture: entangling gates between metastable qubits and mid-circuit sympathetic cooling and readout of a metastable ion by a ground-state ion. Finally, we will take advantage of the larger metastable manifold to explore high-fidelity qudit control.

Dr.Salvatore Andrea Lacava, Postdoctoral Fellow at Johns Hopkins Universitity. Language: English

Title: Active materials and reactive fluids

Speaker: Prof. Chun Liu (Illinois Institute of Technology)

Speaker: Nadia Flodgren (Stockholm University)
Title: An algebraic perspective on the RG flow of φ4-theory at large N
Date and time: 19^th May Monday at 16:00
Location: L4E01
Language: English

[Speaker] Prof. Giorgio Besagni, Associate Professor, Department of Energy, Politecnico di Milano, Italy

Title: Topological regularity of Busemann spaces, Professor Tadashi Fujioka, Kyoto University

Abstract:

We discuss the topological regularity theorem for Busemann spaces of nonpositive curvature, while reviewing the corresponding results for Alexandrov spaces and CAT spaces. All of these are metric spaces with upper or lower curvature bounds in some synthetic senses, and we address the question of when such spaces are topological manifolds. This is joint work with Shijie Gu (Northeastern University, China). Preprint available at arXiv:2504.14455.

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Ken Ono, University of Virginia

Title: Partitions Detect Primes

Berta Hudak, National Center for Theoretical Sciences, Taipei

Title: Representation theory of the Hu algebras

Speaker: Prof. Smarajit Karmakar, Tata Institute of Fundamental Research, India

Language: English