BibTex format
@article{Latacz:2025:10.1038/s41586-025-09323-1,
author = {Latacz, BM and Erlewein, SR and Fleck, M and Jager, JI and Abbass, F and Arndt, BP and Geissler, P and Imamura, T and Leonhardt, M and Micke, P and Mooser, A and Schweitzer, D and Voelksen, F and Wursten, E and Yildiz, H and Blaum, K and Devlin, JA and Matsuda, Y and Ospelkaus, C and Quint, W and Soter, A and Walz, J and Yamazaki, Y and Smorra, C and Ulmer, S},
doi = {10.1038/s41586-025-09323-1},
journal = {Nature},
pages = {64--68},
title = {Coherent spectroscopy with a single antiproton spin},
url = {http://dx.doi.org/10.1038/s41586-025-09323-1},
volume = {644},
year = {2025}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - Coherent quantum transition spectroscopy is a powerful tool in metrology¹, quantum information processing², magnetometry³, and precision tests of the Standard Model. It was applied with great success in proton and deuteron magnetic moment measurements, which culminated in MASER spectroscopy with sub-parts per trillion resolution and many other experiments at the forefront of physics. All these experiments were performed on macroscopic ensembles of particles, while the coherent spectroscopy of a “free” single nuclear spin has never been reported before. Here, we demonstrate coherent quantum transition spectroscopy of the spin of a single antiproton stored in a cryogenic Penning-trap system. We apply a multi-trap technique, detect the antiproton spin-state using the continuous Stern-Gerlach-effect, and transport the particle to the homogeneous magnetic field of a precision trap (PT). Here, we induce the coherent dynamics and analyze the result by quantum-projection measurements in the analysis trap¹ . We observe for the first time Rabi-oscillations of an antiproton spin and achieve in time-series measurements spin inversion probabilities above 80% at spin coherence times of ≈ 50s. Scans of single-particle spin resonances show inversions >70%, at transition line-widths 16 times narrower than in previous measurements, limited by cyclotron frequency measurement decoherence. This achievement marks a major step towards at least 10-fold improved tests of matter/antimatter symmetry using proton and antiproton magnetic moments.
AU - Latacz,BM
AU - Erlewein,SR
AU - Fleck,M
AU - Jager,JI
AU - Abbass,F
AU - Arndt,BP
AU - Geissler,P
AU - Imamura,T
AU - Leonhardt,M
AU - Micke,P
AU - Mooser,A
AU - Schweitzer,D
AU - Voelksen,F
AU - Wursten,E
AU - Yildiz,H
AU - Blaum,K
AU - Devlin,JA
AU - Matsuda,Y
AU - Ospelkaus,C
AU - Quint,W
AU - Soter,A
AU - Walz,J
AU - Yamazaki,Y
AU - Smorra,C
AU - Ulmer,S
DO - 10.1038/s41586-025-09323-1
EP - 68
PY - 2025///
SN - 0028-0836
SP - 64
TI - Coherent spectroscopy with a single antiproton spin
T2 - Nature
UR - http://dx.doi.org/10.1038/s41586-025-09323-1
VL - 644
ER -