We report on the realization of large assembled arrays of more than 300 single $^{87}\mathrm{Rb}$ atoms trapped in optical tweezers in a cryogenic environment at $\ensuremath{\sim}4$ K. For arrays with ${N}_{\mathrm{a}}=324$ atoms, the assembly process results in defect-free arrays in $\ensuremath{\sim}37%$ of the realizations. To achieve this high assembling efficiency, we equalize the loading probability of the traps within the array using a closed-loop optimization of the power of each optical tweezer, based on the analysis of the fluorescence time traces of atoms loaded in the traps.We report on the realization of large assembled arrays of more than 300 single $^{87}\mathrm{Rb}$ atoms trapped in optical tweezers in a cryogenic environment at $\ensuremath{\sim}4$ K. For arrays with ${N}_{\mathrm{a}}=324$ atoms, the assembly process results in defect-free arrays in $\ensuremath{\sim}37%$ of the realizations. To achieve this high assembling efficiency, we equalize the loading probability of the traps within the array using a closed-loop optimization of the power of each optical tweezer, based on the analysis of the fluorescence time traces of atoms loaded in the traps.

arXiv:2207.06500Physical Review AAug 18, 202255 citations

Dynamics of trapped particles in optical tweezers

Thalyta Tavares Martins, Sérgio Ricardo Muniz

Jan 1, 20190 citations

Efficient single-atom transfer from an optical conveyor belt to a tightly confined optical tweezer

Lei Xu, Ling-Xiao Wang, Guang-Jie Chen +5 more

Efficient loading of single atoms into tightly confined traps is crucial for advancing quantum information processing and exploring atom-photon interactions. However, directly loading atoms from a magneto-optical trap (MOT) into static tweezers in cavity-based systems and hybrid atom-photon interfaces remains a challenge. Here, we demonstrate atom loading in a tightly confined optical tweezer 0.6mm away from MOT by an optical conveyor belt. By employing real-time feedback control of the atom number in the overlapping region between the conveyor belt and the tweezer, we enhance a single-atom loading probability to 77.6%. Our technique offers a versatile solution for deterministic single-atom loading in various experimental settings and paves the way for diverse applications based on hybrid photonic-atom structures.Efficient loading of single atoms into tightly confined traps is crucial for advancing quantum information processing and exploring atom-photon interactions. However, directly loading atoms from a magneto-optical trap (MOT) into static tweezers in cavity-based systems and hybrid atom-photon interfaces remains a challenge. Here, we demonstrate atom loading in a tightly confined optical tweezer 0.6mm away from MOT by an optical conveyor belt. By employing real-time feedback control of the atom number in the overlapping region between the conveyor belt and the tweezer, we enhance a single-atom loading probability to 77.6%. Our technique offers a versatile solution for deterministic single-atom loading in various experimental settings and paves the way for diverse applications based on hybrid photonic-atom structures.

arXiv:2507.21456Physical Review AppliedJul 13, 20260 citations

Light-assisted collisions and time-of-flight experiments in optical tweezers

Mark J. Brown, Cindy A. Regal, José Paulo D'Incao +2 more

Bulletin of the American Physical SocietyJun 1, 20210 citations

A dual-region ytterbium tweezer apparatus with an in-vacuum nanofiber cavity

Shunichiro Hashimoto, Hideki Ozawa, Yusuke Hisai +2 more

We present a dual-region experimental apparatus for trapping single atoms of the fermionic isotope ytterbium-171 ( ${}^{171}\mathrm{Yb}$ ) with optical tweezers in a science chamber containing an in-vacuum nanofiber cavity. A source region is located approximately $240\,\mathrm{mm}$ from the science chamber, preserving optical access around the chamber for high-numerical-aperture tweezer optics. A pulsed transport sequence based on longitudinal moving molasses launches atomic pulses toward the science chamber, where they are decelerated and recaptured in a magneto-optical trap. We subsequently load single atoms into a $2\times2$ tweezer array located approximately $50\,\mathrm{μm}$ from the nanofiber and measure a $1/e$ lifetime of $9.5(7)\,\mathrm{s}$ . These results demonstrate that the dual-region architecture provides sufficient ${}^{171}\mathrm{Yb}$ atoms for single-atom tweezer operation near an in-vacuum nanofiber cavity.We present a dual-region experimental apparatus for trapping single atoms of the fermionic isotope ytterbium-171 (${}^{171}\mathrm{Yb}$) with optical tweezers in a science chamber containing an in-vacuum nanofiber cavity. A source region is located approximately $240\,\mathrm{mm}$ from the science chamber, preserving optical access around the chamber for high-numerical-aperture tweezer optics. A pulsed transport sequence based on longitudinal moving molasses launches atomic pulses toward the science chamber, where they are decelerated and recaptured in a magneto-optical trap. We subsequently load single atoms into a $2\times2$ tweezer array located approximately $50\,\mathrm{μm}$ from the nanofiber and measure a $1/e$ lifetime of $9.5(7)\,\mathrm{s}$. These results demonstrate that the dual-region architecture provides sufficient ${}^{171}\mathrm{Yb}$ atoms for single-atom tweezer operation near an in-vacuum nanofiber cavity.

quant-pharXiv:2609.25245Sep 23, 20260 citations

Efficient loading of a single neutral atom into an optical microscopic tweezer

Jun He, Bei Liu, Wen-Ting Diao +3 more

A single atom in a magneto–optical trap (MOT) with trap size (hundreds of micrometers) can be transferred into an optical microscopic tweezer with a probability of ~ 100%. The ability to transfer a single atom into two traps back and forth allows us to study the loading process. The loading probability is found to be insensitive to the geometric overlap of the MOT and the tweezer. It is therefore possible to perform simultaneously loading of a single atom into all sites of the tweezer array for many qubits. In particular, we present a simulation of the one-dimensional and two-dimensional arrays of an optical microscopic tweezer. We find the same qualitative behavior for all of the trap parameters.A single atom in a magneto–optical trap (MOT) with trap size (hundreds of micrometers) can be transferred into an optical microscopic tweezer with a probability of ~ 100%. The ability to transfer a single atom into two traps back and forth allows us to study the loading process. The loading probability is found to be insensitive to the geometric overlap of the MOT and the tweezer. It is therefore possible to perform simultaneously loading of a single atom into all sites of the tweezer array for many qubits. In particular, we present a simulation of the one-dimensional and two-dimensional arrays of an optical microscopic tweezer. We find the same qualitative behavior for all of the trap parameters.

Chinese Physics BMar 31, 20152 citations

We report on the realization of large assembled arrays of more than 300 single

^{87}\mathrm{Rb}

atoms trapped in optical tweezers in a cryogenic environment at $\ensuremath{\sim}4$ K. For arrays with

{N}_{\mathrm{a}}=324

atoms, the assembly process results in defect-free arrays in $\ensuremath{\sim}37%$ of the realizations. To achieve this high assembling efficiency, we equalize the loading probability of the traps within the array using a closed-loop optimization of the power of each optical tweezer, based on the analysis of the fluorescence time traces of atoms loaded in the traps.

We present a dual-region experimental apparatus for trapping single atoms of the fermionic isotope ytterbium-171 (

{}^{171}\mathrm{Yb}

) with optical tweezers in a science chamber containing an in-vacuum nanofiber cavity. A source region is located approximately

240\,\mathrm{mm}

from the science chamber, preserving optical access around the chamber for high-numerical-aperture tweezer optics. A pulsed transport sequence based on longitudinal moving molasses launches atomic pulses toward the science chamber, where they are decelerated and recaptured in a magneto-optical trap. We subsequently load single atoms into a

2\times2

tweezer array located approximately

50\,\mathrm{μm}

from the nanofiber and measure a

1/e

lifetime of

9.5(7)\,\mathrm{s}

. These results demonstrate that the dual-region architecture provides sufficient

{}^{171}\mathrm{Yb}

atoms for single-atom tweezer operation near an in-vacuum nanofiber cavity.