Probing Interactions between Ultracold Fermions

Abstract

At ultracold temperatures, the Pauli exclusion principle suppresses collisions between identical fermions. This has motivated the development of atomic clocks using fermionic isotopes. However, by probing an optical clock transition with thousands of lattice-confined, ultracold fermionic Sr atoms, we have observed density-dependent collisional frequency shifts. These collision effects have been measured systematically and are supported by a theoretical description attributing them to inhomogeneities in the probe excitation process that render the atoms distinguishable. This work has also yielded insights for zeroing the clock density shift.

accepted to Science

References in corpus (13)

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• Compact, thermal-noise-limited optical cavity for diode laser stabilization at 1 x 10-15
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• Effect of cold collisions on spin coherence and resonance shifts in a magnetically trapped ultra-cold gas
• Nuclear Spin Effects in Optical Lattice Clocks
• Observation of p-wave Threshold Law Using Evaporatively Cooled Fermionic Atoms
• The absolute frequency of the 87Sr optical clock transition
• Spectroscopic insensitivity to cold collisions in a two-state mixture of fermions
• Coherent optical phase transfer over a 32-km fiber with 1-s instability at $10^{-17}$
• Properties of metastable alkaline-earth-metal atoms calculated using an accurate effective core potential
• Hyperfine quenching of the metastable ${}^3{P}_{0,2}$ states in divalent atoms
• High-accuracy relativistic many-body calculations of van der Waals coefficients C_6 for alkaline-earth atoms

Cited by in corpus (56)

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• Colloquium: Physics of optical lattice clocks
• Matter-wave Atomic Gradiometer Interferometric Sensor (MAGIS-100)
• Comparison of Two Independent Sr Optical Clocks with 1e-17 Stability at 10^3 s
• A quantum many-body spin system in an optical lattice clock
• Suppression of collisional shifts in a strongly interacting lattice clock
• Rabi Spectroscopy and Excitation Inhomogeneity in a 1D Optical Lattice Clock
• Bose-Einstein condensation of alkaline earth atoms: ${}^{40}${Ca}
• Lattice Induced Frequency Shifts in Sr Optical Lattice Clocks at the $10^{-17}$ Level
• Systematic study of Optical Feshbach Resonances in an ideal gas
• Spin-Orbit Coupling Induced Coherent Production of Feshbach Molecules in a Degenerate Fermi Gas
• The 87-Sr optical frequency standard at PTB
• Quantum correlations and entanglement in far-from-equilibrium spin systems
• Collisional losses, decoherence, and frequency shifts in optical lattice clocks with bosons
• p-Wave cold collisions in an optical lattice clock
• Decoherence and Collisional Frequency Shifts of Trapped Bosons and Fermions
• Probing many-body interactions in an optical lattice clock
• Absolute frequency measurement of the 1S0 - 3P0 transition of 171Yb
• Inelastic collisions and density-dependent excitation suppression in a ${}^{87}$Sr optical lattice clock
• Hamiltonian engineering of spin-orbit coupled fermions in a Wannier-Stark optical lattice clock
• Cold collision shift cancelation and inelastic scattering in a Yb optical lattice clock
• Many-body treatment of the collisional frequency shift in fermionic atoms
• A strontium optical lattice clock with $1\times 10^{-17}$ uncertainty and measurement of its absolute frequency
• A high stability semiconductor laser system for a ${}^{88}$Sr-based optical lattice clock
• Engineering spin squeezing in a 3D optical lattice with interacting spin-orbit-coupled fermions
• Clock spectroscopy of interacting bosons in deep optical lattices
• Cavity-enhanced optical lattices for scaling neutral atom quantum technologies to higher qubit numbers
• Entanglement-Enhanced Optical Atomic Clocks
• Generalized Hyper-Ramsey Resonance with separated oscillating fields
• Clock shifts of optical transitions in ultracold atomic gases
• Doubly Modulated Optical Lattice Clock Interference and Topology
• Spin waves and Collisional Frequency Shifts of a Trapped-Atom Clock
• Dynamical quantum correlations of Ising models on an arbitrary lattice and their resilience to decoherence
• Resolved atomic interaction sidebands in an optical clock transition
• Universal Features of the Excitation Spectrum in Generalized Gibbs Distribution Ensemble
• S-Wave Collisional Frequency Shift of a Fermion Clock
• Fermion bag approach to the sign problem in strongly coupled lattice QED with Wilson fermions
• Improved Frequency Ratio Measurement with 87Sr and 171Yb Optical Lattice Clocks at NMIJ
• Cancellation of Collisional Frequency Shifts in Optical Lattice Clocks with Rabi Spectroscopy
• Pauli blocking of stimulated emission in a degenerate Fermi gas
• Application of lasers to ultracold atoms and molecules
• Thermodynamics of low-dimensional trapped Fermi gases
• Simulating heavy fermion physics in optical lattice: Periodic Anderson model with harmonic trapping potential
• Two-orbital physics of high spin fermionic alkaline earth atoms confined in a one-dimensional chain
• Collisionally Induced Atomic Clock Shifts and Correlations
• Beyond the Spin Model Approximation for Ramsey Spectroscopy
• Rabi spectroscopy of three-dimensional optical lattice clocks
• Magic density in a self-rephasing ensemble of trapped ultracold atoms
• Non-linear Relaxation of Interacting Bosons Coherently Driven on a Narrow Optical Transition
• Simulation of optical lattice trap loading from a cold atomic ensemble
• Interaction-enhanced double resonance in cold gases
• $SU(N)\to SU(2)$ symmetry breaking in quantum antiferromagnets
• Experimental study of magnetically insensitive transitions in ultracold Fermi gas of ${}^{40}$K