Abstract

We report on the detection of individual spin quantum transitions of a single trapped antiproton in a Penning trap. The spin-state determination, which is based on the unambiguous detection of axial frequency shifts in presence of a strong magnetic bottle, reaches a fidelity of 92.1%. Spin-state initialization with >99.9% fidelity and an average initialization time of 24 min are demonstrated. This is a major step towards an antiproton magnetic moment measurement with a relative uncertainty on the part-per-billion level.

Highlights

  • We report on the detection of individual spin quantum transitions of a single trapped antiproton in a Penning trap

  • The feedback system has been crucial for the detection of individual spin transitions with high fidelity, and allowed higher spin state detection fidelity than we reported for protons [19]

  • It is composed of three Gaussian distributions with the probability density functions (PDF) h0(∆, 0, Ξref ), h−(∆, −∆νSF, Ξref ) and h+(∆, +∆νSF, Ξref ) describing the events with no spin transition, transition to the spin-down state and spin-up state, respectively. ∆ is the frequency shift of the spin-flip drive, and the second and third parameter of the PDFs are the mean value and the standard deviation of the distribution, respectively, which we suppress in the following for a compact notation

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Summary

Observation of individual spin quantum transitions of a single antiproton

Germany eGraduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan fInstitut fur Physik, Johannes Gutenberg-Universitat Mainz, D-55099 Mainz, Germany gPhysikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany hGSI-Helmholtzzentrum fur Schwerionenforschung, D-64291 Darmstadt, Germany iRuprecht-Karls-Universitat Heidelberg, D-69047 Heidelberg, Germany jHelmholtz-Institut Mainz, D-55099 Mainz, Germany kAtomic Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

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