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Full Single-Quantum Control of Particles in Penning Traps for Symmetry Tests at the Quantum Limit

J. M. Cornejo, J. -A. Coenders, A. Lissel, N. Poljakov, M. Prasse, Y. Priewich, J. Schaper, M. Schubert, B. Hampel, M. Schilling, S. Ulmer, C. Ospelkaus

Abstract

The BASE collaboration aims to measure antimatter systems with the highest precision in order to perform a rigorous test of CPT symmetry and search for physics beyond the Standard Model. As part of the BASE collaboration, we pursue the development of quantum logic inspired cooling and detection techniques for g-factor measurements of (anti-)protons. Implementing these methods requires full quantum-level control of individual antimatter particles confined in cryogenic Penning traps. By mapping the (anti-)proton's internal state onto a co-trapped 9Be+ "logic" ion via free Coulomb coupling in a double-well potential, we can accelerate measurement cycles and push g-factor precision measurements on (anti-)protons toward the quantum limit. Here, we present an overview of the proposed method and the current status of the project, with special emphasis on the new cryogenic multi-Penning-trap stack and the proton detection system.

Full Single-Quantum Control of Particles in Penning Traps for Symmetry Tests at the Quantum Limit

Abstract

The BASE collaboration aims to measure antimatter systems with the highest precision in order to perform a rigorous test of CPT symmetry and search for physics beyond the Standard Model. As part of the BASE collaboration, we pursue the development of quantum logic inspired cooling and detection techniques for g-factor measurements of (anti-)protons. Implementing these methods requires full quantum-level control of individual antimatter particles confined in cryogenic Penning traps. By mapping the (anti-)proton's internal state onto a co-trapped 9Be+ "logic" ion via free Coulomb coupling in a double-well potential, we can accelerate measurement cycles and push g-factor precision measurements on (anti-)protons toward the quantum limit. Here, we present an overview of the proposed method and the current status of the project, with special emphasis on the new cryogenic multi-Penning-trap stack and the proton detection system.
Paper Structure (4 sections, 2 equations, 2 figures)

This paper contains 4 sections, 2 equations, 2 figures.

Table of Contents

  1. Introduction
  2. Quantum logic inspired techniques for $\bm{g}$-factor measurements with (anti-)protons
  3. Penning trap systems
  4. Summary and outlook

Figures (2)

  • Figure 1: Two-dimensional CAD drawing of the complete Penning trap stacks with specialized trap zones. The previous version of the trap is shown in the top panel. Several modifications have been implemented in the updated trap system to enable the manipulation of single protons. The electrodes are made of gold-plated oxygen-free high thermal conductivity (OFHC) copper and are electrically insulated by sapphire rings. The trap is located at the center of a 5 T superconducting magnet and cooled to a temperature of approximately 5 K. Further details are provided in the text.
  • Figure 2: a) Photograph of a single electrode from the micro coupling trap, showing the C-shaped structure designed for self-alignment. A detailed view of the inner hole used as a hollow cylindrical electrode, with an inner diameter of 800 µ m, is shown in the bottom right corner. b) Photograph of the Printed Circuit Board (PCB) featuring four kinetic inductance resonators to be tested in our trap system. In the bottom right corner, a microscopic view of a meander structure with gold bonding is shown.