Spin decoupling and line narrowing are observed for the first time in an optical transition, $^{3}H_{4}\ensuremath{\leftrightarrow}^{1}D_{2}$ of ${\mathrm{Pr}}^{3+}$ in La ${\mathrm{F}}_{3}$ at 2\ifmmode^\circ\else\textdegree\fi{}K, with use of optical free-induction decay. The $^{19}\mathrm{F}$ nuclei, when irradiated by an appropriate rf field, undergo forced precession about an effective field at the magic angle in the rotating frame. The fluctuating $^{19}\mathrm{F}$ - $^{19}\mathrm{F}$ dipolar interaction is thereby quenched and the optical linewidth drops from \ensuremath{\sim}10 to \ensuremath{\sim}2 kHz, as predicted in a theory of spin diffusion.Spin decoupling and line narrowing are observed for the first time in an optical transition, $^{3}H_{4}\ensuremath{\leftrightarrow}^{1}D_{2}$ of ${\mathrm{Pr}}^{3+}$ in La${\mathrm{F}}_{3}$ at 2\ifmmode^\circ\else\textdegree\fi{}K, with use of optical free-induction decay. The $^{19}\mathrm{F}$ nuclei, when irradiated by an appropriate rf field, undergo forced precession about an effective field at the magic angle in the rotating frame. The fluctuating $^{19}\mathrm{F}$-$^{19}\mathrm{F}$ dipolar interaction is thereby quenched and the optical linewidth drops from \ensuremath{\sim}10 to \ensuremath{\sim}2 kHz, as predicted in a theory of spin diffusion.

Physical Review LettersDec 17, 197966 citations

Collective inhibition of light scattering from atoms into an optical cavity at a magic frequency

Á. Kurkó, B. Gábor, D. Varga +8 more

We report on the observation of a new magic frequency within the hyperfine structure of the D2 line of ${}^{87}$ Rb atoms at which the scattering of light into a high-finesse cavity is suppressed by an interplay between quantum interference and the strong collective coupling of atoms to the cavity. Scattering from a cloud of laser-driven cold atoms into the cavity was measured in a polarization sensitive way. We have found that both the Rayleigh and Raman scattering processes into the near-resonant cavity modes are extinguished at 185 MHz below the F=2 $\leftrightarrow$ F'=3 transition frequency. This coincidence together with the shape of the observed spectral dip imply that the effect relies on a quantum interference in the polariton excitations of the strongly coupled combined atom-photon system. We have also demonstrated the existence of a magic frequency around -506 MHz, where only the Raman scattering is suppressed due to a quantum interference effect at the single-atom level.We report on the observation of a new magic frequency within the hyperfine structure of the D2 line of ${}^{87}$Rb atoms at which the scattering of light into a high-finesse cavity is suppressed by an interplay between quantum interference and the strong collective coupling of atoms to the cavity. Scattering from a cloud of laser-driven cold atoms into the cavity was measured in a polarization sensitive way. We have found that both the Rayleigh and Raman scattering processes into the near-resonant cavity modes are extinguished at 185 MHz below the F=2$\leftrightarrow$F'=3 transition frequency. This coincidence together with the shape of the observed spectral dip imply that the effect relies on a quantum interference in the polariton excitations of the strongly coupled combined atom-photon system. We have also demonstrated the existence of a magic frequency around -506 MHz, where only the Raman scattering is suppressed due to a quantum interference effect at the single-atom level.

quant-pharXiv:2601.08978Jan 15, 20260 citations

Probing quantum effects in lithium

Rong Zhang, Shanti Deemyad

Bulletin of the American Physical SocietyMar 6, 20180 citations

Tunable Interactions in Quantum Degenerate Lithium

Kevin E. Strecker

Bulletin of the American Physical SocietyJan 1, 20041 citation

Optical Lattice Experiments with Lithium-7

Ivana Dimitrova, William D. M. Lunden, Niklas Jepsen +3 more

Bulletin of the American Physical SocietyJun 12, 20150 citations

Spin decoupling and line narrowing are observed for the first time in an optical transition, $^{3}H_{4}\ensuremath{\leftrightarrow}^{1}D_{2}$ of

{\mathrm{Pr}}^{3+}

in La

{\mathrm{F}}_{3}

at 2\ifmmode^\circ\else\textdegree\fi{}K, with use of optical free-induction decay. The

^{19}\mathrm{F}

nuclei, when irradiated by an appropriate rf field, undergo forced precession about an effective field at the magic angle in the rotating frame. The fluctuating

^{19}\mathrm{F}

^{19}\mathrm{F}

dipolar interaction is thereby quenched and the optical linewidth drops from \ensuremath{\sim}10 to \ensuremath{\sim}2 kHz, as predicted in a theory of spin diffusion.

We report on the observation of a new magic frequency within the hyperfine structure of the D2 line of

{}^{87}

Rb atoms at which the scattering of light into a high-finesse cavity is suppressed by an interplay between quantum interference and the strong collective coupling of atoms to the cavity. Scattering from a cloud of laser-driven cold atoms into the cavity was measured in a polarization sensitive way. We have found that both the Rayleigh and Raman scattering processes into the near-resonant cavity modes are extinguished at 185 MHz below the F=2

\leftrightarrow

F'=3 transition frequency. This coincidence together with the shape of the observed spectral dip imply that the effect relies on a quantum interference in the polariton excitations of the strongly coupled combined atom-photon system. We have also demonstrated the existence of a magic frequency around -506 MHz, where only the Raman scattering is suppressed due to a quantum interference effect at the single-atom level.