Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

JSAP-OSA Joint Symposia

Phase separation of Rabi-coupled spin states in an 87Rb F = 1 BEC

Kosuke Shibata, Hitoshi Shibayama, Aki Torii, Ryota Suzuki, Hiroyuki Toda, Yujiro Eto, Masahiro O. Takahashi, Hiroki Saito, Takuya Hirano

Published Jan 1, 2017• 0 citations
Publisher

Abstract

A Bose-Einstein condensate (BEC) in cold atoms allows us to explore the nature of quantum phenomena in a controlled way. One of the most common tools for the control of a BEC system is an electromagnetic field. Particularly, the Rabi oscillations induced by light or RF pulses are often used for manipulation of the magnetic sublevels in atoms. The electromagnetic field can also change the interatomic interaction via the state mixing.

DOI
10.1364/jsap.2017.7p_a410_8

Related papers

Atom–molecule coherence in a Bose–Einstein condensate

Elizabeth A. Donley, N. R. Claussen, Sarah T. Thompson +1 more

Abstract Recent advances in the precise control of ultracold atomic systems have led to the realisation of Bose–Einstein condensates (BECs) and degenerate Fermi gases. An important challenge is to extend this level of control to more complicated molecular systems. One route for producing ultracold molecules is to form them from the atoms in a BEC. For example, a two-photon stimulated Raman transition in a 87Rb BEC has been used to produce 87Rb2 molecules in a single rotational-vibrational state1, and ultracold molecules have also been formed2 through photoassociation of a sodium BEC. Although the coherence properties of such systems have not hitherto been probed, the prospect of creating a superposition of atomic and molecular condensates has initiated much theoretical work3, 4, 5, 6, 7. Here we make use of a time-varying magnetic field near a Feshbach resonance8, 9, 10, 11, 12 to produce coherent coupling between atoms and molecules in a 85Rb BEC. A mixture of atomic and molecular states is created and probed by sudden changes in the magnetic field, which lead to oscillations in the number of atoms that remain in the condensate. The oscillation frequency, measured over a large range of magnetic fields, is in excellent agreement with the theoretical molecular binding energy, indicating that we have created a quantum superposition of atoms and diatomic molecules—two chemically different species.

WORLD SCIENTIFIC eBooks•Jan 1, 2008•1 citation

Interaction modulation in a long-lived Bose-Einstein condensate by rf coupling

Kosuke Shibata, Aki Torii, Hitoshi Shibayama +3 more

We demonstrate modulation of the effective interaction between the magnetic sublevels of the hyperfine spin $F=1$ in a $^{87}\mathrm{Rb}$ Bose-Einstein condensate by Rabi coupling with radio-frequency (rf) field. The use of the $F=1$ manifold enables us to observe the long-term evolution of the system owing to the absence of inelastic collisional losses. We observe that the evolution of the density distribution reflects the change in the effective interaction between atoms due to rf coupling. We also realize a miscibility-to-immiscibility transition in the magnetic sublevels of $m=\ifmmode\pm\else\textpm\fi{}1$ by quenching the rf field. Rf-induced interaction modulation in long-lived states as demonstrated here will facilitate the study of out-of-equilibrium quantum systems.

arXiv:1812.01284•Physical Review A•Jan 24, 2019•13 citations

Making, probing and understanding Bose-Einstein condensates

Wolfgang Ketterle, Dallin Durfee, Dan Stamper-Kurn

The realization of Bose-Einstein condensation (BEC) in dilute atomic gases [1, 2, 3, 4, 5] achieved several long-standing goals. First, neutral atoms were cooled into the lowest energy state, thus exerting ultimate control over the motion and position of atoms, limited only by Heisenberg’s uncertainty relation. Second, a coherent macroscopic sample of atoms all occupying the same quantum state was generated,

•Apr 2, 1999•251 citations

Bose-Einstein Condensate

Aranya B. Bhattacherjee

Bose-Einstein condensate (BEC) is a state of matter in which all the neutral atoms or subatomic particles are cooled down to a temperature very near to absolute zero. Quantum effects become apparent on a macroscopic scale at the critical temperature which leads to macroscopic quantum phenomena. The efforts made by Bose and Einstein introduced the novel idea of a Bose gas obeying the quantum statistics known as Bose-Einstein statistics. These statistics depict the distribution of identical particles having integral spin which are well-recognized as bosons. Cavity quantum optomechanics is an emerging field which controls the quantum mechanical interaction between electromagnetic radiation and bulk mechanical resonators. Cavity optomechanical system consisting of BEC has extremely high potential applications in the areas of quantum communications and quantum information processing. A strong quantum entanglement can be achieved between the mechanical mode of the BEC and the optical mode. One of the major limitations is that the apparatus involving BEC are extremely expensive and bulky.

Apple Academic Press eBooks•May 10, 2020•2 citations

Electromagnetically induced transparency in a spin-orbit coupled Bose-Einstein condensate

Zhengfeng Hu, Chengpu Liu, Jinming Liu +1 more

The artificial field can be generated by properly arranging pulsed magnetic fields interacting with a Bose-Einstein condensate (BEC), which can be widely used to simulate the phenomena of traditional condensed matter physics, such as spin-orbit (SO) coupling and the neutral atom spin Hall effect. The introduction of SO coupling in a BEC will alter its optical properties. Eletromagnetically induced transparency (EIT) is a powerful tool that can change and detect the properties of an atomic medium in a nondestructive way. It is important and interesting to study EIT properties and to investigate the effects of SO coupling on EIT. In this paper, we investigate EIT in a SO-coupled BEC. Not only is the transparency existing, but the real and imaginary parts of the susceptibility have an additional red frequency shift, which is linearly proportional to the strength of the SO coupling. By using this unconventional, sensitive EIT spectrum, SO coupling can be detected and its strength can be accurately measured according to the frequency shift.

Optics Express•Jul 25, 2018•8 citations

From Superfluid to Insulator: Bose–Einstein Condensate Undergoes a Quantum Phase Transition

Barbara Goss Levi

The atoms in a BEC assemble gregariously into a coherent whole, but in a periodic potential that’s sufficiently strong, they can separate into an array of isolated atoms.

Physics Today•Mar 1, 2002•2 citations
A Bose-Einstein condensate (BEC) in cold atoms allows us to explore the nature of quantum phenomena in a controlled way. One of the most common tools for the control of a BEC system is an electromagnetic field. Particularly, the Rabi oscillations induced by light or RF pulses are often used for manipulation of the magnetic sublevels in atoms. The electromagnetic field can also change the interatomic interaction via the state mixing.
Abstract Recent advances in the precise control of ultracold atomic systems have led to the realisation of Bose–Einstein condensates (BECs) and degenerate Fermi gases. An important challenge is to extend this level of control to more complicated molecular systems. One route for producing ultracold molecules is to form them from the atoms in a BEC. For example, a two-photon stimulated Raman transition in a 87Rb BEC has been used to produce 87Rb2 molecules in a single rotational-vibrational state1, and ultracold molecules have also been formed2 through photoassociation of a sodium BEC. Although the coherence properties of such systems have not hitherto been probed, the prospect of creating a superposition of atomic and molecular condensates has initiated much theoretical work3, 4, 5, 6, 7. Here we make use of a time-varying magnetic field near a Feshbach resonance8, 9, 10, 11, 12 to produce coherent coupling between atoms and molecules in a 85Rb BEC. A mixture of atomic and molecular states is created and probed by sudden changes in the magnetic field, which lead to oscillations in the number of atoms that remain in the condensate. The oscillation frequency, measured over a large range of magnetic fields, is in excellent agreement with the theoretical molecular binding energy, indicating that we have created a quantum superposition of atoms and diatomic molecules—two chemically different species.
We demonstrate modulation of the effective interaction between the magnetic sublevels of the hyperfine spin F=1F=1F=1 in a 87Rb^{87}\mathrm{Rb}87Rb Bose-Einstein condensate by Rabi coupling with radio-frequency (rf) field. The use of the F=1F=1F=1 manifold enables us to observe the long-term evolution of the system owing to the absence of inelastic collisional losses. We observe that the evolution of the density distribution reflects the change in the effective interaction between atoms due to rf coupling. We also realize a miscibility-to-immiscibility transition in the magnetic sublevels of $m=\ifmmode\pm\else\textpm\fi{}1$ by quenching the rf field. Rf-induced interaction modulation in long-lived states as demonstrated here will facilitate the study of out-of-equilibrium quantum systems.
Bose-Einstein condensate (BEC) is a state of matter in which all the neutral atoms or subatomic particles are cooled down to a temperature very near to absolute zero. Quantum effects become apparent on a macroscopic scale at the critical temperature which leads to macroscopic quantum phenomena. The efforts made by Bose and Einstein introduced the novel idea of a Bose gas obeying the quantum statistics known as Bose-Einstein statistics. These statistics depict the distribution of identical particles having integral spin which are well-recognized as bosons. Cavity quantum optomechanics is an emerging field which controls the quantum mechanical interaction between electromagnetic radiation and bulk mechanical resonators. Cavity optomechanical system consisting of BEC has extremely high potential applications in the areas of quantum communications and quantum information processing. A strong quantum entanglement can be achieved between the mechanical mode of the BEC and the optical mode. One of the major limitations is that the apparatus involving BEC are extremely expensive and bulky.
The artificial field can be generated by properly arranging pulsed magnetic fields interacting with a Bose-Einstein condensate (BEC), which can be widely used to simulate the phenomena of traditional condensed matter physics, such as spin-orbit (SO) coupling and the neutral atom spin Hall effect. The introduction of SO coupling in a BEC will alter its optical properties. Eletromagnetically induced transparency (EIT) is a powerful tool that can change and detect the properties of an atomic medium in a nondestructive way. It is important and interesting to study EIT properties and to investigate the effects of SO coupling on EIT. In this paper, we investigate EIT in a SO-coupled BEC. Not only is the transparency existing, but the real and imaginary parts of the susceptibility have an additional red frequency shift, which is linearly proportional to the strength of the SO coupling. By using this unconventional, sensitive EIT spectrum, SO coupling can be detected and its strength can be accurately measured according to the frequency shift.