For practical quantum computing, it will be necessary to detect the fluorescence from trapped ions using microscale ion trap chips. We describe the first design, fabrication and assembly of a set of diffractive optics for intimate integration into the trap chip and for coupling this fluorescence into multimode fibers. The design is complicated by the constraints of the ion trap environment. In addition, the choice of available materials is restricted to those compatible with ultrahigh vacuum. The completed optics-ion trap assembly has successfully demonstrated ion trapping, as well as ion shuttling, with no necessary modifications to the trapping and shuttling voltage levels.For practical quantum computing, it will be necessary to detect the fluorescence from trapped ions using microscale ion trap chips. We describe the first design, fabrication and assembly of a set of diffractive optics for intimate integration into the trap chip and for coupling this fluorescence into multimode fibers. The design is complicated by the constraints of the ion trap environment. In addition, the choice of available materials is restricted to those compatible with ultrahigh vacuum. The completed optics-ion trap assembly has successfully demonstrated ion trapping, as well as ion shuttling, with no necessary modifications to the trapping and shuttling voltage levels.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEJul 1, 20101 citation

Integrated Technologies for Chip-Scale Trapped-Ion Quantum Control

Robert McConnell, Suraj Bramhavar, Colin Bruzewicz +10 more

Bulletin of the American Physical SocietyJun 6, 20170 citations

Quantum Computing With Trapped Ions: An overview

Wen-Han Png, Ting Hsu, Tze-Wei Liu +2 more

An array of trapped atomic ions that are laser cooled and isolated in an ultrahigh-vacuum environment presents one of the most advanced physical platforms for realizing a practical quantum computer. Small-scale ion quantum computers up to tens of ions have been built and achieved the highest fidelities on elementary quantum operations and overall quantum volume (QV). This article provides an overview of the elements of trapped-ion quantum computing (TIQC), current achievements in the field, and future perspectives.An array of trapped atomic ions that are laser cooled and isolated in an ultrahigh-vacuum environment presents one of the most advanced physical platforms for realizing a practical quantum computer. Small-scale ion quantum computers up to tens of ions have been built and achieved the highest fidelities on elementary quantum operations and overall quantum volume (QV). This article provides an overview of the elements of trapped-ion quantum computing (TIQC), current achievements in the field, and future perspectives.

IEEE Nanotechnology MagazineJun 16, 202210 citations

Design and control of microfabricated ion traps for quantum computing

Zak David Romaszko

Jun 29, 20200 citations

Atom-chip Bose-Einstein condensation in a portable vacuum cell

Shengwang Du, Matthew B. Squires, Yutaka Imai +6 more

A $^{87}\mathrm{Rb}$ Bose-Einstein condensate (BEC) is produced in a portable atom-chip system less than $30\ifmmode\times\else\texttimes\fi{}30\ifmmode\times\else\texttimes\fi{}15\phantom{\rule{0.3em}{0ex}}\mathrm{cm}$, where the ultrahigh vacuum is maintained by a small, $8\phantom{\rule{0.3em}{0ex}}\mathrm{L}∕\mathrm{s}$ , ion pump and nonevaporable getter. An aluminum nitride chip with lithographically patterned copper is used to seal the vacuum system, provide the electrical feedthroughs, and create the magnetic trap potentials. All cooling and trapping processes occur $0.6--2.5\phantom{\rule{0.3em}{0ex}}\mathrm{mm}$ from ambient laboratory air. A condensate of about 2000 $^{87}\mathrm{Rb}$ atoms in $F=2,{m}_{F}=2$ is achieved after $4.21\phantom{\rule{0.3em}{0ex}}\mathrm{s}$ of rf forced evaporation. A magneto-optical trap lifetime of $30\phantom{\rule{0.3em}{0ex}}\mathrm{s}$ indicates the vacuum near the chip surface is about ${10}^{\ensuremath{-}10}\phantom{\rule{0.3em}{0ex}}\text{torr}$. This work suggests that a chip-based BEC-compatible vacuum system can occupy a volume of less than $0.5\phantom{\rule{0.3em}{0ex}}\mathrm{L}$ .A $^{87}\mathrm{Rb}$ Bose-Einstein condensate (BEC) is produced in a portable atom-chip system less than $30\ifmmode\times\else\texttimes\fi{}30\ifmmode\times\else\texttimes\fi{}15\phantom{\rule{0.3em}{0ex}}\mathrm{cm}$, where the ultrahigh vacuum is maintained by a small, $8\phantom{\rule{0.3em}{0ex}}\mathrm{L}∕\mathrm{s}$, ion pump and nonevaporable getter. An aluminum nitride chip with lithographically patterned copper is used to seal the vacuum system, provide the electrical feedthroughs, and create the magnetic trap potentials. All cooling and trapping processes occur $0.6--2.5\phantom{\rule{0.3em}{0ex}}\mathrm{mm}$ from ambient laboratory air. A condensate of about 2000 $^{87}\mathrm{Rb}$ atoms in $F=2,{m}_{F}=2$ is achieved after $4.21\phantom{\rule{0.3em}{0ex}}\mathrm{s}$ of rf forced evaporation. A magneto-optical trap lifetime of $30\phantom{\rule{0.3em}{0ex}}\mathrm{s}$ indicates the vacuum near the chip surface is about ${10}^{\ensuremath{-}10}\phantom{\rule{0.3em}{0ex}}\text{torr}$. This work suggests that a chip-based BEC-compatible vacuum system can occupy a volume of less than $0.5\phantom{\rule{0.3em}{0ex}}\mathrm{L}$.

Physical Review ANov 10, 2004122 citations

^{87}\mathrm{Rb}

Bose-Einstein condensate (BEC) is produced in a portable atom-chip system less than $30\ifmmode\times\else\texttimes\fi{}30\ifmmode\times\else\texttimes\fi{}15\phantom{\rule{0.3em}{0ex}}\mathrm{cm}$, where the ultrahigh vacuum is maintained by a small,

8\phantom{\rule{0.3em}{0ex}}\mathrm{L}∕\mathrm{s}

, ion pump and nonevaporable getter. An aluminum nitride chip with lithographically patterned copper is used to seal the vacuum system, provide the electrical feedthroughs, and create the magnetic trap potentials. All cooling and trapping processes occur

0.6--2.5\phantom{\rule{0.3em}{0ex}}\mathrm{mm}

from ambient laboratory air. A condensate of about 2000

^{87}\mathrm{Rb}

atoms in

F=2,{m}_{F}=2

is achieved after

4.21\phantom{\rule{0.3em}{0ex}}\mathrm{s}

of rf forced evaporation. A magneto-optical trap lifetime of

30\phantom{\rule{0.3em}{0ex}}\mathrm{s}

indicates the vacuum near the chip surface is about ${10}^{\ensuremath{-}10}\phantom{\rule{0.3em}{0ex}}\text{torr}$. This work suggests that a chip-based BEC-compatible vacuum system can occupy a volume of less than

0.5\phantom{\rule{0.3em}{0ex}}\mathrm{L}