Observation of individual spin quantum transitions of a single antiproton

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.

References in corpus (2)

• Direct high-precision measurement of the magnetic moment of the proton
• Highly-sensitive superconducting circuits at ~700 kHz with tunable quality factors for image-current detection of single trapped antiprotons

Cited by in corpus (5)

• Constraints on the Coupling between Axionlike Dark Matter and Photons Using an Antiproton Superconducting Tuned Detection Circuit in a Cryogenic Penning Trap
• Direct limits on the interaction of antiprotons with axion-like dark matter
• Measurement of ultra-low heating rates of a single antiproton in a cryogenic Penning trap
• Sympathetic cooling schemes for separately trapped ions coupled via image currents
• Quantum logic inspired techniques for spacetime-symmetry tests with (anti-)protons