Erik Benkler
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View article: Transportable strontium lattice clock with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>4</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>19</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> blackbody radiation shift uncertainty
Transportable strontium lattice clock with blackbody radiation shift uncertainty Open
We describe a transportable optical lattice clock based on the transition of lattice-trapped 87 Sr atoms with a total systematic uncertainty of . The blackbody radiation shift, which is the leading systematic effect i…
View article: Transportable strontium lattice clock with $4 \times 10^{-19}$ blackbody radiation shift uncertainty
Transportable strontium lattice clock with $4 \times 10^{-19}$ blackbody radiation shift uncertainty Open
We describe a transportable optical lattice clock based on the $^1\mathrm{S}_0 \rightarrow {^3\mathrm{P}_0}$ transition of lattice-trapped $^{87}$Sr atoms with a total systematic uncertainty of $2.1 \times 10^{-18}$. The blackbody radiatio…
View article: Entanglement-enhanced optical ion clock
Entanglement-enhanced optical ion clock Open
Entangled states hold the promise of improving the precision and accuracy of quantum sensors. We experimentally demonstrate that spectroscopy of an optical clock transition using entangled states can outperform its classical counterpart. T…
View article: Excited-State Magnetic Properties of Carbon-like <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Ca</mml:mi></mml:mrow><mml:mrow><mml:mn>14</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>
Excited-State Magnetic Properties of Carbon-like Open
We measured the g-factor of the excited-state P1
View article: Nonlinear Calcium King Plot Constrains New Bosons and Nuclear Properties
Nonlinear Calcium King Plot Constrains New Bosons and Nuclear Properties Open
Nonlinearities in King plots (KP) of isotope shifts (IS) can reveal the existence of beyond-standard-model (BSM) interactions that couple electrons and neutrons. However, it is crucial to distinguish higher-order standard model (SM) effect…
View article: Coordinated international comparisons between optical clocks connected via fiber and satellite links
Coordinated international comparisons between optical clocks connected via fiber and satellite links Open
Optical clocks provide ultraprecise frequency references that are vital for international metrology as well as for tests of fundamental physics. To investigate the level of agreement between different clocks, we simultaneously measured the…
View article: Guidelines for designs for ultrastable laser with $\mathbf{10^{-17}}$ fractional frequency instability
Guidelines for designs for ultrastable laser with $\mathbf{10^{-17}}$ fractional frequency instability Open
Lasers with long coherence time and narrow linewidth are an essential tool for quantum sensors and clocks. Ultrastable cavities and laser systems are now commercially available with fractional frequency instabilities in the mid $10^{-16}$ …
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:msup><mml:mrow><mml:mi>In</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>115</mml:mn></mml:mrow></mml:mmultiscripts><mml:mtext>−</mml:mtext><mml:mrow><mml:mmultiscripts><mml:mrow><mml:msup><mml:mrow><mml:mi>Yb</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>172</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:mrow></mml:math> Coulomb Crystal Clock with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>2.5</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mrow><mml:mn>10</mml:mn></mml:mrow><mml:mrow><mml:mo>−</mml:mo><mml:mn>18</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math> Systematic Uncertainty
Coulomb Crystal Clock with Systematic Uncertainty Open
We present a scalable mixed-species Coulomb crystal clock based on the S0
View article: Nonlinear calcium King plot constrains new bosons and nuclear properties
Nonlinear calcium King plot constrains new bosons and nuclear properties Open
Nonlinearities in King plots (KP) of isotope shifts (IS) can reveal the\nexistence of beyond-Standard-Model (BSM) interactions that couple electrons and\nneutrons. However, it is crucial to distinguish higher-order Standard Model\n(SM) eff…
View article: Robust Optical Clocks for International Timescales (ROCIT)
Robust Optical Clocks for International Timescales (ROCIT) Open
The recently concluded collaborative European project “Robust optical clocks for international timescales” (ROCIT) tackled some of the key challenges on the roadmap towards a redefinition of the SI second. This paper gives an overview of p…
View article: International comparison of optical frequencies with transportable optical lattice clocks
International comparison of optical frequencies with transportable optical lattice clocks Open
Optical clocks have improved their frequency stability and estimated accuracy by more than two orders of magnitude over the best caesium microwave clocks that realise the SI second. Accordingly, an optical redefinition of the second has be…
View article: Long-distance chronometric leveling with a portable optical clock
Long-distance chronometric leveling with a portable optical clock Open
We have measured the geopotential difference between two locations separated by 457 km by comparison of two optical lattice clocks via an interferometric fiber link, utilizing the gravitational redshift of the clock transition frequency. T…
View article: $^{115}$In$^+$-$^{172}$Yb$^+$ Coulomb crystal clock with $2.5\times10^{-18}$ systematic uncertainty
$^{115}$In$^+$-$^{172}$Yb$^+$ Coulomb crystal clock with $2.5\times10^{-18}$ systematic uncertainty Open
We present a scalable mixed-species Coulomb crystal clock based on the $^1S_0$ $\leftrightarrow$ $^3P_0$ transition in $^{115}$In$^+$. $^{172}$Yb$^+$ ions are co-trapped and used for sympathetic cooling. Reproducible interrogation conditio…
View article: Long-distance chronometric leveling with a portable optical clock
Long-distance chronometric leveling with a portable optical clock Open
We have measured the geopotential difference between two locations separated by $457~\mathrm{km}$ by comparison of two optical lattice clocks via an interferometric fiber link, utilizing the gravitational redshift of the clock transition f…
View article: Improved Limits on the Coupling of Ultralight Bosonic Dark Matter to Photons from Optical Atomic Clock Comparisons
Improved Limits on the Coupling of Ultralight Bosonic Dark Matter to Photons from Optical Atomic Clock Comparisons Open
We present improved constraints on the coupling of ultralight bosonic dark matter to photons based on long-term measurements of two optical frequency ratios. In these optical clock comparisons, we relate the frequency of the ^{2}S_{1/2}(F=…
View article: Frequency ratio of the Ar13+ clock transition and the 171Yb+ ocutpole transition
Frequency ratio of the Ar13+ clock transition and the 171Yb+ ocutpole transition Open
Measured and corrected frequency ratio between the optical clock transition in Ar13+ and the octupole transition in 171Yb+. Data is provided for the two isotopes 40Ar13+ and 36
View article: Frequency ratio of the Ar13+ clock transition and the 171Yb+ ocutpole transition
Frequency ratio of the Ar13+ clock transition and the 171Yb+ ocutpole transition Open
Measured and corrected frequency ratio between the optical clock transition in Ar13+ and the octupole transition in 171Yb+. Data is provided for the two isotopes 40Ar13+ and 36
View article: An Optical Atomic Clock Based on a Highly Charged Ion
An Optical Atomic Clock Based on a Highly Charged Ion Open
Optical atomic clocks are the most accurate measurement devices ever constructed and have found many applications in fundamental science and technology. The use of highly charged ions (HCI) as a new class of references for highest accuracy…
View article: Erratum: Coherent Excitation of the Highly Forbidden Electric Octupole Transition in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:msup><mml:mrow><mml:mi>Yb</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>172</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> [Phys. Rev. Lett. <b>125</b>, 163001 (2020)]
Erratum: Coherent Excitation of the Highly Forbidden Electric Octupole Transition in [Phys. Rev. Lett. <b>125</b>, 163001 (2020)] Open
This corrects the article DOI: 10.1103/PhysRevLett.125.163001.
View article: Data for "Comparing ultrastable lasers at 7×10-17 fractional frequency instability through a 2220 km optical fibre network"
Data for "Comparing ultrastable lasers at 7×10-17 fractional frequency instability through a 2220 km optical fibre network" Open
Here we share the relevant data of the manuscript “Comparing ultrastable lasers at 7×10-17 fractional frequency instability through a 2,220 km optical fibre network”. Raw data was acquired using multiple synchronised, dead-time …
View article: Data for "Comparing ultrastable lasers at 7×10-17 fractional frequency instability through a 2220 km optical fibre network"
Data for "Comparing ultrastable lasers at 7×10-17 fractional frequency instability through a 2220 km optical fibre network" Open
Here we share the relevant data of the manuscript “Comparing ultrastable lasers at 7×10-17 fractional frequency instability through a 2,220 km optical fibre network”. Raw data was acquired using multiple synchronised, dead-time …
View article: Validating frequency transfer via interferometric fiber links for optical clock comparisons
Validating frequency transfer via interferometric fiber links for optical clock comparisons Open
We investigate the validation of fiber-based optical frequency transfer for frequency comparison applications. We specifically consider the frequency transfer validation for remote optical clock comparisons and want to ensure interferometr…
View article: Universal formalism for data sharing and processing in clock comparison networks
Universal formalism for data sharing and processing in clock comparison networks Open
We present a mathematical framework adapted to the comparison of atomic\nclocks remotely connected by a complex network of optical or microwave links.\nThis framework facilitates the computation of frequency ratios using a generic\nset of …
View article: Optical frequency ratio of a <sup>171</sup>Yb<sup>+</sup> single-ion clock and a <sup>87</sup>Sr lattice clock
Optical frequency ratio of a <sup>171</sup>Yb<sup>+</sup> single-ion clock and a <sup>87</sup>Sr lattice clock Open
We report direct measurements of the frequency ratio of the 642 THz electric octupole transition in 171 Yb + and the 429 THz transition in 87 Sr. A series of 107 measurements has been perfo…
View article: Simple and compact diode laser system stabilized to Doppler-broadened iodine lines at 633 nm
Simple and compact diode laser system stabilized to Doppler-broadened iodine lines at 633 nm Open
We present a compact iodine-stabilized laser system at 633 nm, based on a distributed-feedback laser diode. Within a footprint of , the system provides 5 mW of frequency-stabilized light from a single-mode fiber. Its performance was evalua…
View article: Coherent Excitation of the Highly Forbidden Electric Octupole Transition in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:msup><mml:mrow><mml:mi>Yb</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>172</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>
Coherent Excitation of the Highly Forbidden Electric Octupole Transition in Open
We report on the first coherent excitation of the highly forbidden S21/2?F27/2 electric octupole (E3) transition in a single trapped Yb+172 ion, an isotope without nuclear spin. Using the transition in Yb+171 as a reference, we determine t…
View article: Search for transient variations of the fine structure constant and dark matter using fiber-linked optical atomic clocks
Search for transient variations of the fine structure constant and dark matter using fiber-linked optical atomic clocks Open
We search for transient variations of the fine structure constant using data from a European network of fiber-linked optical atomic clocks. By searching for coherent variations in the recorded clock frequency comparisons across the network…
View article: End-to-end topology for fiber comb based optical frequency transfer at the 10<sup>−21</sup> level: erratum
End-to-end topology for fiber comb based optical frequency transfer at the 10<sup>−21</sup> level: erratum Open
In this erratum we correct errors in the scaling and caption of Fig. 4 in the original manuscript [1].
View article: Phase noise of frequency doublers in optical clock lasers
Phase noise of frequency doublers in optical clock lasers Open
Frequency doublers are widely used in high-resolution spectroscopy to shift the operation wavelength of a laser to a more easily accessible or otherwise preferable spectral region. We investigate the use of a periodically-poled lithium nio…
View article: Search for transient variations of the fine structure constant and dark\n matter using fiber-linked optical atomic clocks
Search for transient variations of the fine structure constant and dark\n matter using fiber-linked optical atomic clocks Open
We search for transient variations of the fine structure constant using data\nfrom a European network of fiber-linked optical atomic clocks. By searching for\ncoherent variations in the recorded clock frequency comparisons across the\nnetw…