We study light-assisted collisions in an ensemble containing a small number ($\ensuremath{\sim}$3) of cold ${}^{87}$ Rb atoms trapped in a microscopic dipole trap. Using our ability to operate with one atom exactly in the trap, we measure the one-body heating rate associated with a near-resonant laser excitation, and we use this measurement to extract the two-body loss rate associated with light-assisted collisions when a few atoms are present in the trap. Our measurements indicate that the two-body loss rate can reach surprisingly large values $\ensuremath{\beta}>{10}^{\ensuremath{-}8}$ cm ${}^{3}$ s${}^{\ensuremath{-}1}$ and varies rapidly with the trap depth and the parameters of the excitation light.We study light-assisted collisions in an ensemble containing a small number ($\ensuremath{\sim}$3) of cold ${}^{87}$Rb atoms trapped in a microscopic dipole trap. Using our ability to operate with one atom exactly in the trap, we measure the one-body heating rate associated with a near-resonant laser excitation, and we use this measurement to extract the two-body loss rate associated with light-assisted collisions when a few atoms are present in the trap. Our measurements indicate that the two-body loss rate can reach surprisingly large values $\ensuremath{\beta}>{10}^{\ensuremath{-}8}$ cm${}^{3}$ s${}^{\ensuremath{-}1}$ and varies rapidly with the trap depth and the parameters of the excitation light.

arXiv:1107.5781Physical Review AJun 25, 201259 citations

ENTANGLEMENT IN MANY-BODY QUANTUM PHYSICS

Frank Verstraete

Recent Progress in Many-Body TheoriesJun 1, 20080 citations

Quantitative Probes of Entanglement Using Collisional Microscopy

Craig Price, Qi Liu, Nathan Gemelke

Bulletin of the American Physical SocietyJun 9, 20150 citations

Large light-assisted collision rates between cold atoms in a microscopic dipole trap

Andreas Fuhrmanek, Ronan Bourgain, Yvan R. P. Sortais +1 more

We study light-assisted collisions in an ensemble containing a small number (~3) of cold Rb87 atoms trapped in a microscopic dipole trap. Using our ability to operate with one atom exactly in the trap, we measure the one-body heating rate associated to a near-resonant laser excitation, and we use this measurement to extract the two-body loss rate associated to light-assisted collisions when a few atoms are present in the trap. Our measurements indicate that the two-body loss rate can reach surprisingly large values beta>10^{-8} cm^{3}.s^{-1} and varies rapidly with the trap depth and the parameters of the excitation light.We study light-assisted collisions in an ensemble containing a small number (~3) of cold Rb87 atoms trapped in a microscopic dipole trap. Using our ability to operate with one atom exactly in the trap, we measure the one-body heating rate associated to a near-resonant laser excitation, and we use this measurement to extract the two-body loss rate associated to light-assisted collisions when a few atoms are present in the trap. Our measurements indicate that the two-body loss rate can reach surprisingly large values beta>10^{-8} cm^{3}.s^{-1} and varies rapidly with the trap depth and the parameters of the excitation light.

Jul 28, 20110 citations

Three-Body Problem in a Dilute Bose-Einstein Condensate

Thorsten Köhler

We derive the explicit three-body contact potential for a dilute condensed Bose gas from microscopic theory. The three-body coupling constant exhibits the general form predicted by Wu [Phys. Rev. 115, 1390 (1959)]] and is determined in terms of the amplitudes of two- and three-body collisions in vacuum. In the present form, the coupling constant becomes accessible to quantitative studies which should provide the crucial link between few-body collisions and the stability of condensates with attractive two-body forces.We derive the explicit three-body contact potential for a dilute condensed Bose gas from microscopic theory. The three-body coupling constant exhibits the general form predicted by Wu [Phys. Rev. 115, 1390 (1959)]] and is determined in terms of the amplitudes of two- and three-body collisions in vacuum. In the present form, the coupling constant becomes accessible to quantitative studies which should provide the crucial link between few-body collisions and the stability of condensates with attractive two-body forces.

arXiv:cond-mat/0209431Physical Review LettersNov 1, 2002128 citations

Solving Many-Body Problems with a Quantum Microscope

Anonymous

PhysicsJun 14, 20171 citation

We study light-assisted collisions in an ensemble containing a small number ($\ensuremath{\sim}$3) of cold

{}^{87}

Rb atoms trapped in a microscopic dipole trap. Using our ability to operate with one atom exactly in the trap, we measure the one-body heating rate associated with a near-resonant laser excitation, and we use this measurement to extract the two-body loss rate associated with light-assisted collisions when a few atoms are present in the trap. Our measurements indicate that the two-body loss rate can reach surprisingly large values $\ensuremath{\beta}>{10}^{\ensuremath{-}8}$ cm

{}^{3}

s${}^{\ensuremath{-}1}$ and varies rapidly with the trap depth and the parameters of the excitation light.