TY - JOUR

T1 - Quantum logic inspired techniques for spacetime-symmetry tests with (anti-)protons

AU - Cornejo, Juan M

AU - Lehnert, Ralf

AU - Niemann, Malte

AU - Mielke, Johannes

AU - Meiners, Teresa

AU - Bautista-Salvador, Amado

AU - Schulte, Marius

AU - Nitzschke, Diana

AU - Borchert, Matthias J

AU - Hammerer, Klemens

AU - Ulmer, Stefan

AU - Ospelkaus, Christian

PY - 2021/7/29

Y1 - 2021/7/29

N2 - Cosmological observations as well as theoretical approaches to physics beyond the standard model provide strong motivations for experimental tests of fundamental symmetries, such as CPT invariance. In this context, the availability of cold baryonic antimatter at CERN has opened an avenue for ultrahigh-precision comparisons of protons and antiprotons in Penning traps. This work discusses an experimental method inspired by quantum logic techniques that will improve particle localization and readout speed in such experiments. The method allows for sympathetic cooling of the (anti-)proton to its quantum-mechanical ground state as well as the readout of its spin alignment, replacing the commonly used continuous Stern–Gerlach effect. Both of these features are achieved through coupling to a laser-cooled ‘logic’ ion co-trapped in a double-well potential. This technique will boost the measurement sampling rate and will thus provide results with lower statistical uncertainty, contributing to stringent searches for time dependent variations in the data. Such measurements ultimately yield extremely high sensitivities to CPT violating coefficients acting on baryons in the standard-model extension, will allow the exploration of previously unmeasured types of symmetry violations, and will enable antimatter-based axion-like dark matter searches with improved mass resolution.

AB - Cosmological observations as well as theoretical approaches to physics beyond the standard model provide strong motivations for experimental tests of fundamental symmetries, such as CPT invariance. In this context, the availability of cold baryonic antimatter at CERN has opened an avenue for ultrahigh-precision comparisons of protons and antiprotons in Penning traps. This work discusses an experimental method inspired by quantum logic techniques that will improve particle localization and readout speed in such experiments. The method allows for sympathetic cooling of the (anti-)proton to its quantum-mechanical ground state as well as the readout of its spin alignment, replacing the commonly used continuous Stern–Gerlach effect. Both of these features are achieved through coupling to a laser-cooled ‘logic’ ion co-trapped in a double-well potential. This technique will boost the measurement sampling rate and will thus provide results with lower statistical uncertainty, contributing to stringent searches for time dependent variations in the data. Such measurements ultimately yield extremely high sensitivities to CPT violating coefficients acting on baryons in the standard-model extension, will allow the exploration of previously unmeasured types of symmetry violations, and will enable antimatter-based axion-like dark matter searches with improved mass resolution.

KW - CPT symmetry

KW - Penning traps

KW - laser cooling

KW - precision measurements

KW - quantum logic spectroscopy

KW - trapped ions

UR - http://www.scopus.com/inward/record.url?scp=85112614468&partnerID=8YFLogxK

U2 - 10.1088/1367-2630/ac136e

DO - 10.1088/1367-2630/ac136e

M3 - Article

VL - 23

JO - New journal of physics

JF - New journal of physics

SN - 1367-2630

IS - 7

M1 - 073045

ER -