Christian Sanner
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View article: Geometric phase amplification in a clock interferometer for enhanced metrology
Geometric phase amplification in a clock interferometer for enhanced metrology Open
High-precision measurements are crucial for testing the fundamental laws of nature and advancing the technological frontier. Clock interferometry, where particles with an internal clock are coherently split and recombined along two spatial…
View article: Geometric phase amplification in a clock interferometer for enhanced metrology
Geometric phase amplification in a clock interferometer for enhanced metrology Open
High-precision measurements are crucial for testing the fundamental laws of nature and for advancing the technological frontier. Clock interferometry, where particles with an internal clock are coherently split and recombined along two spa…
View article: High-fidelity imaging of a band insulator in a three-dimensional optical lattice clock
High-fidelity imaging of a band insulator in a three-dimensional optical lattice clock Open
Here, we report on the observation of a high-density, band insulating state in a three-dimensional optical lattice clock. Filled with a nuclear-spin-polarized degenerate Fermi gas of 87Sr, the three-dimensional (3D) lattice has one atom pe…
View article: Observation of mHz-level cooperative Lamb shifts in an optical atomic clock
Observation of mHz-level cooperative Lamb shifts in an optical atomic clock Open
We report on the direct observation of resonant electric dipole-dipole interactions in a cubic array of atoms in the many-excitation limit. The interactions, mediated by single-atom couplings to the shared electromagnetic vacuum, are shown…
View article: Replication Data for: Pauli blocking of atom-light scattering
Replication Data for: Pauli blocking of atom-light scattering Open
Replication Data for: Pauli blocking of atom-light scattering, Fig. 3, Fig. 4, Fig. S1
View article: Dipole-Dipole Frequency Shifts in Multilevel Atoms
Dipole-Dipole Frequency Shifts in Multilevel Atoms Open
Dipole-dipole interactions lead to frequency shifts that are expected to limit the performance of next-generation atomic clocks. In this work, we compute dipolar frequency shifts accounting for the intrinsic atomic multilevel structure in …
View article: Pauli blocking of atomic spontaneous decay
Pauli blocking of atomic spontaneous decay Open
Spontaneous decay of an excited atomic state is a fundamental process that originates from the interaction between matter and vacuum modes of the electromagnetic field. The rate of decay can thus be engineered by modifying the density of f…
View article: Improved Limits for Violations of Local Position Invariance from Atomic Clock Comparisons
Improved Limits for Violations of Local Position Invariance from Atomic Clock Comparisons Open
We compare two optical clocks based on the ^{2}S_{1/2}(F=0)→^{2}D_{3/2}(F=2) electric quadrupole (E2) and the ^{2}S_{1/2}(F=0)→^{2}F_{7/2}(F=3) electric octupole (E3) transition of ^{171}Yb^{+} and measure the frequency ratio ν_{E3}/ν_{E2}…
View article: Coherent Suppression of Tensor Frequency Shifts through Magnetic Field Rotation
Coherent Suppression of Tensor Frequency Shifts through Magnetic Field Rotation Open
We introduce a scheme to coherently suppress second-rank tensor frequency shifts in atomic clocks, relying on the continuous rotation of an external magnetic field during the free atomic state evolution in a Ramsey sequence. The method ret…
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: Direct comparisons of European primary and secondary frequency standards via satellite techniques
Direct comparisons of European primary and secondary frequency standards via satellite techniques Open
We carried out a 26-day comparison of five simultaneously operated optical clocks and six atomic fountain clocks located at INRIM, LNE-SYRTE, NPL and PTB by using two satellite-based frequency comparison techniques: broadband Two-Way Satel…
View article: Engineering Quantum States of Matter for Atomic Clocks in Shallow Optical Lattices
Engineering Quantum States of Matter for Atomic Clocks in Shallow Optical Lattices Open
We investigate the effects of stimulated scattering of optical lattice photons on atomic coherence times in a state-of-the art ^{87}Sr optical lattice clock. Such scattering processes are found to limit the achievable coherence times to le…
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…
View article: Optical clock intercomparison with $6\times 10^{-19}$ precision in one hour
Optical clock intercomparison with $6\times 10^{-19}$ precision in one hour Open
Improvements in atom-light coherence are foundational to progress in quantum information science, quantum optics, and precision metrology. Optical atomic clocks require local oscillators with exceptional optical coherence due to the challe…
View article: Two clock transitions in neutral Yb for the highest sensitivity to variations of fundamental constants
Two clock transitions in neutral Yb for the highest sensitivity to variations of fundamental constants Open
We propose a new frequency standard based on a $4f^{14} 6s6p~ ^3\!P_0 - 4f^{13} 6s^2 5d ~(J=2)$ transition in neutral Yb. This transition has a potential for high stability and accuracy and the advantage of the highest sensitivity among at…
View article: Two Clock Transitions in Neutral Yb for the Highest Sensitivity to Variations of the Fine-Structure Constant
Two Clock Transitions in Neutral Yb for the Highest Sensitivity to Variations of the Fine-Structure Constant Open
We propose a new frequency standard based on a 4f^{14}6s6p ^{3}P_{0}-4f^{13}6s^{2}5d (J=2) transition in neutral Yb. This transition has a potential for high stability and accuracy and the advantage of the highest sensitivity among atomic …
View article: Autobalanced Ramsey Spectroscopy
Autobalanced Ramsey Spectroscopy Open
We devise a perturbation-immune version of Ramsey's method of separated oscillatory fields. Spectroscopy of an atomic clock transition without compromising the clock's accuracy is accomplished by actively balancing the spectroscopic respon…
View article: Two clock transitions in neutral Yb for the highest sensitivity to variations of the fine-structure constant
Two clock transitions in neutral Yb for the highest sensitivity to variations of the fine-structure constant Open
We propose a new frequency standard based on a $4f^{14} 6s6p~ ^3\!P_0 - 4f^{13} 6s^2 5d ~(J=2)$ transition in neutral Yb. This transition has a potential for high stability and accuracy and the advantage of the highest sensitivity among at…