The ${}^1{\mathrm{S}}_0$-${}^3{\mathrm{P}}_2$ magnetic quadrupole transition in neutral strontium

Abstract

We present a detailed investigation of the ultranarrow magnetic-quadrupole ${}^1{\mathrm{S}}_0$-${}^3{\mathrm{P}}_2$ transition in neutral strontium and show how it can be made accessible for quantum simulation and quantum computation. By engineering the light shift in a one-dimensional optical lattice, we perform high-resolution spectroscopy and observe the characteristic absorption patterns for a magnetic quadrupole transition. We measure an absolute transition frequency of 446,647,242,704(2) kHz in ${}^{88}\mathrm{Sr}$ and an ${}^{88}\mathrm{Sr}$-${}^{87}\mathrm{Sr}$ isotope shift of +62.91(4) MHz. In a proof-of-principle experiment, we use this transition to demonstrate local addressing in an optical lattice with 532 nm spacing with a Rayleigh-criterion resolution of 494(45) nm. Our results pave the way for applications of the magnetic quadrupole transition as an optical qubit and for single-site addressing in optical lattices.

22 pages, 9 figures

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• Optical pumping of ${5s4d}^1{\mathrm{D}}_2$ strontium atoms for laser cooling and imaging
• Dynamic polarizabilities and triple magic trapping conditions for $5s^2{}^1{S}_0\to 5s5p{}^3{P}_{0,2}$ transitions of Cd atoms
• Realization of a fast triple-magic all-optical qutrit in strontium-88
• Plane-selective manipulations of nuclear spin qubits in a three-dimensional optical tweezer array
• Orders-of-magnitude improvement in precision spectroscopy of an inner-shell orbital clock transition in neutral ytterbium
• Collinear Three-Photon Excitation of a Strongly Forbidden Optical Clock Transition
• Differential polarizability at 1064 nm of the strontium intercombination transition
• Turquoise Magic Wavelength of the ${}^{87}$Sr Clock Transition