Subradiance of multilevel fermionic atoms in arrays with filling $n\ge 2$

Abstract

We investigate the subradiance properties of $n\ge 2$ multilevel fermionic atoms loaded into the lowest motional level of a single trap (e.g.~a single optical lattice site or an optical tweezer). As pointed out in our previous work [arXiv:1907.05541], perfectly dark subradiant states emerge from the interplay between fermionic statistics and dipolar interactions. While in [arXiv:1907.05541] we focused on the $n=2$ case, here we provide an in-depth analysis of the single-site dark states for generic filling $n$, and show a tight connection between generic dark states and total angular momentum eigenstates. We show how the latter can also be used to understand the full eigenstate structure of the single-site problem, which we analyze numerically. Apart from this, we discuss two possible schemes to coherently prepare dark states using either a Raman transition or an external magnetic field to lift the Zeeman degeneracy. Although the analysis focuses on the single-site problem, we show that multi-site dark states can be trivially constructed in any geometry out of product states of single-site dark states. Finally, we discuss some possible implementations with alkaline-earth(-like) atoms such as ${}^{171}$Yb or ${}^{87}$Sr loaded into optical lattices, where they could be used for potential applications in quantum metrology and quantum information.

arXiv comment15+8 pages, 9 figures

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• Optical Properties of Concentric Nanorings of Quantum Emitters
• Dynamics of spin-momentum entanglement from superradiant phase transitions
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