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Rev. Lett."],"accepted":{"date-parts":[[2026,1,20]]},"abstract":"<jats:p>\n                    We present a quantum logic scheme mitigating systematic effects in the measurement of magnetic properties of ions caused by temporal magnetic field fluctuations through comagnetometry. This is achieved through simultaneous interrogation of a spectroscopy ion and a cotrapped reference ion with a precisely known\n                    <a:math xmlns:a=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <a:mi>g<\/a:mi>\n                    <\/a:math>\n                    factor confined in a Paul trap. This allows measurement of the ground state\n                    <c:math xmlns:c=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <c:mi>g<\/c:mi>\n                    <\/c:math>\n                    factors of a single\n                    <e:math xmlns:e=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <e:mrow>\n                        <e:mmultiscripts>\n                          <e:mrow>\n                            <e:msup>\n                              <e:mrow>\n                                <e:mi>Ti<\/e:mi>\n                              <\/e:mrow>\n                              <e:mrow>\n                                <e:mo>+<\/e:mo>\n                              <\/e:mrow>\n                            <\/e:msup>\n                          <\/e:mrow>\n                          <e:mprescripts\/>\n                          <e:none\/>\n                          <e:mrow>\n                            <e:mn>48<\/e:mn>\n                          <\/e:mrow>\n                        <\/e:mmultiscripts>\n                      <\/e:mrow>\n                    <\/e:math>\n                    ion with uncertainties at the\n                    <g:math xmlns:g=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <g:msup>\n                        <g:mn>10<\/g:mn>\n                        <g:mrow>\n                          <g:mo>\u2212<\/g:mo>\n                          <g:mn>6<\/g:mn>\n                        <\/g:mrow>\n                      <\/g:msup>\n                    <\/g:math>\n                    level in the weak\n                    <i:math xmlns:i=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <i:mi>B<\/i:mi>\n                    <\/i:math>\n                    -field regime. The experimental scheme can be applied to many ions, including those that cannot be directly laser cooled. We compare the experimentally determined\n                    <k:math xmlns:k=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <k:mi>g<\/k:mi>\n                    <\/k:math>\n                    factors of\n                    <m:math xmlns:m=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <m:mrow>\n                        <m:mmultiscripts>\n                          <m:mrow>\n                            <m:msup>\n                              <m:mrow>\n                                <m:mi>Ti<\/m:mi>\n                              <\/m:mrow>\n                              <m:mrow>\n                                <m:mo>+<\/m:mo>\n                              <\/m:mrow>\n                            <\/m:msup>\n                          <\/m:mrow>\n                          <m:mprescripts\/>\n                          <m:none\/>\n                          <m:mrow>\n                            <m:mn>48<\/m:mn>\n                          <\/m:mrow>\n                        <\/m:mmultiscripts>\n                      <\/m:mrow>\n                    <\/m:math>\n                    with new theoretical predictions using a combination of configuration interaction and second-order many-body perturbation theory. Theory and experiment agree within the expected level of accuracy.\n                  <\/jats:p>","DOI":"10.1103\/1x4h-5ycp","type":"journal-article","created":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T14:01:32Z","timestamp":1768917692000},"update-policy":"https:\/\/doi.org\/10.1103\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Land\u00e9\n                    <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <mml:mi>g<\/mml:mi>\n                    <\/mml:math>\n                    Factor Measurement of\n                    <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <mml:msup>\n                        <mml:mrow\/>\n                        <mml:mn>48<\/mml:mn>\n                      <\/mml:msup>\n                      <mml:msup>\n                        <mml:mi>Ti<\/mml:mi>\n                        <mml:mo>+<\/mml:mo>\n                      <\/mml:msup>\n                    <\/mml:math>\n                    Using Simultaneous Comagnetometry and Quantum Logic Spectroscopy"],"prefix":"10.1103","volume":"136","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5060-3868","authenticated-orcid":true,"given":"Till","family":"Rehmert","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05r3f7h03","id-type":"ROR","asserted-by":"publisher"}],"name":"Physikalisch-Technische Bundesanstalt"},{"id":[{"id":"https:\/\/ror.org\/0304hq317","id-type":"ROR","asserted-by":"publisher"}],"name":"Leibniz Universit\u00e4t Hannover"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1952-618X","authenticated-orcid":true,"given":"Maximilian J.","family":"Zawierucha","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05r3f7h03","id-type":"ROR","asserted-by":"publisher"}],"name":"Physikalisch-Technische 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