2024/06/04 by Alexandra Tofful, A Tofful, Charles F. A. Baynham +20 · 2 citations
Decision Sciences · Medicine · Physics and Astronomy · #Advanced Frequency and Time Standards #Cardiovascular Syncope and Autonomic Disorders #Scientific Measurement and Uncertainty Evaluation
paper · doi:10.1088/1681-7575/ad53cd
openalex publication_date 2024/06/04 · crossref created 2024/06/04 · openalex created_date 2024/06/05 · crossref issued 2024/06/17 · crossref published 2024/06/17 · crossref published-online 2024/06/17 · crossref deposited 2024/07/24 · crossref published-print 2024/08/01 · crossref indexed 2026/08/01 · openalex updated_date 2026/08/01
Abstract A full evaluation of the uncertainty budget for the ytterbium ion optical clock at the National Physical Laboratory (NPL) was performed on the electric octupole (E3) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msup> <mml:mrow/> <mml:mn>2</mml:mn> </mml:msup> <mml:msub> <mml:mtext>S</mml:mtext> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> <mml:msup> <mml:mo>→</mml:mo> <mml:mn>2</mml:mn> </mml:msup> <mml:msub> <mml:mtext>F</mml:mtext> <mml:mrow> <mml:mn>7</mml:mn> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> transition. The total systematic frequency shift was measured with a fractional standard systematic uncertainty of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mn>2.2</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>18</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> . Furthermore, the absolute frequency of the E3 transition of the 171 Yb + ion was measured between 2019 and 2023 via a link to International Atomic Time (TAI) and against the local caesium fountain NPL-CsF2. The absolute frequencies were measured with fractional standard uncertainties between <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mn>3.7</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>16</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mn>1.1</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>15</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> , and all were in agreement with the 2021 BIPM recommended frequency.