Atom chips are a reliable and versatile tool for the production and control of Bose-Einstein Condensates (BECs). They also offer the possibility of realising new, chip-based quantum devices. We have recently produced BECs on an atom chip fabricated with silver foil. Because of its high current capacity, our chip can produce moderately tight traps at distances further from the chip surface, avoiding losses and fragmentation of condensates seen on other experiments. We will also report on our progress towards efficient atom detection using a STIRAP based photoionisation scheme.Atom chips are a reliable and versatile tool for the production and control of Bose-Einstein Condensates (BECs). They also offer the possibility of realising new, chip-based quantum devices. We have recently produced BECs on an atom chip fabricated with silver foil. Because of its high current capacity, our chip can produce moderately tight traps at distances further from the chip surface, avoiding losses and fragmentation of condensates seen on other experiments. We will also report on our progress towards efficient atom detection using a STIRAP based photoionisation scheme.

Jan 1, 20050 citations

Low-dimensional BEC

Francisco J. Sevilla, M. Grether, Mauricio Fortes +4 more

arXiv:cond-mat/0006458Journal of Low Temperature PhysicsDec 1, 20009 citations

Ups and downs in a BEC

Anonymous

PhysicsAug 16, 20100 citations

Miniature Bose–Einstein condensate system design based on a transparent atom chip

Jun Jie Cheng, Xiaolin Li, Jingfang Zhang +4 more

Abstract We propose a new miniature Bose–Einstein condensate (BEC) system based on a transparent atom chip with a compact external coil structure. A standard six-beam macroscopic magneto-optical trap (MOT) is able to be created near the chip surface due to the chip’s transparency. A novel wire pattern consisting of a double-z wire and a z-shaped wire is designed on the transparent atom chip. With a vertical bias magnetic field, the double-z wire can create the quadrupole magnetic field of an intermediate chip MOT, which is suitable for transporting atoms from the macroscopic MOT to the chip z-wire trap efficiently. The compact external coil structure is designed with a rectangular frameless geometry consisting of only four coil pairs and its volume is less than 0.3 liters. The maximum system power consumption during the BEC generation procedure is about 45 W. The miniature system is evaluated, and about 3 × 10 6 atoms can be loaded into the chip z-wire trap. The miniature chip BEC system has the advantages of small volume and low power consumption, and it has great potential for practical applications of BEC.Abstract We propose a new miniature Bose–Einstein condensate (BEC) system based on a transparent atom chip with a compact external coil structure. A standard six-beam macroscopic magneto-optical trap (MOT) is able to be created near the chip surface due to the chip’s transparency. A novel wire pattern consisting of a double-z wire and a z-shaped wire is designed on the transparent atom chip. With a vertical bias magnetic field, the double-z wire can create the quadrupole magnetic field of an intermediate chip MOT, which is suitable for transporting atoms from the macroscopic MOT to the chip z-wire trap efficiently. The compact external coil structure is designed with a rectangular frameless geometry consisting of only four coil pairs and its volume is less than 0.3 liters. The maximum system power consumption during the BEC generation procedure is about 45 W. The miniature system is evaluated, and about 3 × 10 6 atoms can be loaded into the chip z-wire trap. The miniature chip BEC system has the advantages of small volume and low power consumption, and it has great potential for practical applications of BEC.

Journal of Physics B Atomic Molecular and Optical PhysicsJul 22, 20163 citations

The BEC–BCS Crossover

R. Combescot

Cambridge University Press eBooksMar 10, 20220 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}