Bulletin of the American Physical Society

Spectroscopy of the Cs 6s-5d quadrupole transition for qubit measurements

Tian Xia, Alex Carr, Gang Li, Siyuan Zhang, Mark E. Saffman

Published Jun 7, 2012• 1 citation

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Bulletin of the American Physical Society

Spectroscopy of the Cs 6s-5d quadrupole transition for qubit measurements

Tian Xia, Alex Carr, Gang Li, Siyuan Zhang, Mark E. Saffman

Published Jun 7, 2012• 1 citation

OpenAlex

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Mladen Movre, Cedomil Vadla, Vlasta Horvatić

Applying the cw laser absorption and fluorescence method the cross sections for the fine-structure mixing and quenching of the caesium 5D J states have been measured in pure caesium vapour. Caesium atoms were optically excited to the 5D 5/2 state via the quadrupole-allowed 6S 1/2 →5D 5/2 transition. The ground-state caesium density N 0 , obtained from the absorption at the pumped quadrupole transition, and the fluorescence intensity I 689 of the sensitized 5D 3/2 →6S 1/2 emission were measured simultaneously in the range 3×10 14 cm -3 ⩽ N 0 ⩽1×10 16 cm -3 at constant temperature T = 585 K. It was found that the quantity N 0 2 / I 689 exhibited a parabolic dependence on N 0 , confirming that the quenching of the Cs 5D J states is due to collisions with Cs ground-state atoms, not molecules. The coefficients of the second-order polynomial fitted through the measured data yielded the cross sections σ 5/2→3/2 = (57±19)×10 -16 cm 2 and σ D = (35±10)×10 -16 cm 2 for the Cs 5D J fine-structure mixing and quenching, respectively, due to collisions with caesium ground-state atoms. Using recently calculated Cs*+Cs potentials we performed an analysis which shows good agreement between the measured values and the theoretical predictions.Applying the cw laser absorption and fluorescence method the cross sections for the fine-structure mixing and quenching of the caesium 5D J states have been measured in pure caesium vapour. Caesium atoms were optically excited to the 5D 5/2 state via the quadrupole-allowed 6S 1/2 →5D 5/2 transition. The ground-state caesium density N 0 , obtained from the absorption at the pumped quadrupole transition, and the fluorescence intensity I 689 of the sensitized 5D 3/2 →6S 1/2 emission were measured simultaneously in the range 3×10 14 cm -3 ⩽ N 0 ⩽1×10 16 cm -3 at constant temperature T = 585 K. It was found that the quantity N 0 2 / I 689 exhibited a parabolic dependence on N 0 , confirming that the quenching of the Cs 5D J states is due to collisions with Cs ground-state atoms, not molecules. The coefficients of the second-order polynomial fitted through the measured data yielded the cross sections σ 5/2→3/2 = (57±19)×10 -16 cm 2 and σ D = (35±10)×10 -16 cm 2 for the Cs 5D J fine-structure mixing and quenching, respectively, due to collisions with caesium ground-state atoms. Using recently calculated Cs*+Cs potentials we performed an analysis which shows good agreement between the measured values and the theoretical predictions.

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B. V. Dobrydnev, Mark D. Havey

An earlier study of the 6s ${\mathrm{}}^{2}$ ${\mathit{S}}_{1/2}$ \ensuremath{\rightarrow}5d ${\mathrm{}}^{2}$ ${\mathit{D}}_{\mathit{j}}$ \ensuremath{\rightarrow}11p ${\mathrm{}}^{2}$ ${\mathit{P}}_{3/2}$ two-photon, dipole-quadrupole transition in Cs is extended by including the effect of an external static electric field. The dependence of the absorption spectrum on the relative polarizations of the two light sources is found to be greatly modified by a moderately sized electric field, the predominant effect being mixing of the resonant 6p ${\mathrm{}}^{2}$ ${\mathit{P}}_{\mathit{j}}$ levels into the ground 6s ${\mathrm{}}^{2}$ ${\mathit{S}}_{1/2}$ level. Compact theoretical expressions, parametrized in terms of the electric-field strength and the relative transition matrix elements through the 5d ${\mathrm{}}^{2}$ ${\mathit{D}}_{\mathit{j}}$ multiplet levels, are given. Results are presented for the electric-field dependence of a linear depolarization ratio, which is very sensitive to these quantities. \textcopyright{} 1996 The American Physical Society.An earlier study of the 6s${\mathrm{}}^{2}$${\mathit{S}}_{1/2}$\ensuremath{\rightarrow}5d${\mathrm{}}^{2}$${\mathit{D}}_{\mathit{j}}$\ensuremath{\rightarrow}11p${\mathrm{}}^{2}$${\mathit{P}}_{3/2}$ two-photon, dipole-quadrupole transition in Cs is extended by including the effect of an external static electric field. The dependence of the absorption spectrum on the relative polarizations of the two light sources is found to be greatly modified by a moderately sized electric field, the predominant effect being mixing of the resonant 6p${\mathrm{}}^{2}$${\mathit{P}}_{\mathit{j}}$ levels into the ground 6s${\mathrm{}}^{2}$${\mathit{S}}_{1/2}$ level. Compact theoretical expressions, parametrized in terms of the electric-field strength and the relative transition matrix elements through the 5d${\mathrm{}}^{2}$${\mathit{D}}_{\mathit{j}}$ multiplet levels, are given. Results are presented for the electric-field dependence of a linear depolarization ratio, which is very sensitive to these quantities. \textcopyright{} 1996 The American Physical Society.

Physical Review ANov 1, 19962 citations

An earlier study of the 6s

{\mathrm{}}^{2}

{\mathit{S}}_{1/2}

\ensuremath{\rightarrow}5d

{\mathrm{}}^{2}

{\mathit{D}}_{\mathit{j}}

\ensuremath{\rightarrow}11p

{\mathrm{}}^{2}

{\mathit{P}}_{3/2}

two-photon, dipole-quadrupole transition in Cs is extended by including the effect of an external static electric field. The dependence of the absorption spectrum on the relative polarizations of the two light sources is found to be greatly modified by a moderately sized electric field, the predominant effect being mixing of the resonant 6p

{\mathrm{}}^{2}

{\mathit{P}}_{\mathit{j}}

levels into the ground 6s

{\mathrm{}}^{2}

{\mathit{S}}_{1/2}

level. Compact theoretical expressions, parametrized in terms of the electric-field strength and the relative transition matrix elements through the 5d

{\mathrm{}}^{2}

{\mathit{D}}_{\mathit{j}}

multiplet levels, are given. Results are presented for the electric-field dependence of a linear depolarization ratio, which is very sensitive to these quantities. \textcopyright{} 1996 The American Physical Society.