Modification of atom scattering using an intercombination-line optical Feshbach resonance at large detuning

We report control of the scattering wave function by an optical Feshbach resonance effect using ytterbium atoms. The narrow intercombination line (1S0-3P1) is used for efficient control as proposed by Ciuryło et al. [Phys. Rev. A 71, 030701(R) (2005)10.1103/PhysRevA.71.030701]. The manipulation of the scattering wave function is monitored with the change of a photoassociation rate caused by another laser. The optical Feshbach resonance is especially efficient for isotopes with large negative scattering lengths such as 172Yb, and we have confirmed that the scattering phase shift divided by the wave number, which gives the scattering length in the zero energy limit, is changed by about 30 nm.We report control of the scattering wave function by an optical Feshbach resonance effect using ytterbium atoms. The narrow intercombination line (1S0-3P1) is used for efficient control as proposed by Ciuryło et al. [Phys. Rev. A 71, 030701(R) (2005)10.1103/PhysRevA.71.030701]. The manipulation of the scattering wave function is monitored with the change of a photoassociation rate caused by another laser. The optical Feshbach resonance is especially efficient for isotopes with large negative scattering lengths such as 172Yb, and we have confirmed that the scattering phase shift divided by the wave number, which gives the scattering length in the zero energy limit, is changed by about 30 nm.

Physical Review LettersNov 11, 2008172 citations

Classification of Feshbach resonances in electron-molecule scattering

David James Spence

Jan 1, 19761 citation

Controlling nuclear spin exchange via optical Feshbach resonances in Y171b

Iris Reichenbach, Paul S. Julienne, Ivan Deutsch

Nuclear spin exchange occurs in ultracold collisions of fermionic alkaline-earth-metal-like atoms due to a difference between $s$ - and $p$ -wave phase shifts. We study the use of an optical Feshbach resonance, excited on the ${^{1}S}_{0}\ensuremath{\rightarrow}{^{3}P}_{1}$ intercombination line of $^{171}\text{Y}\text{b}$ , to affect a large modification of the $s$ -wave scattering phase shift and thereby optically mediate nuclear exchange forces. We perform a full multichannel calculation of the photoassociation resonances and wave functions and from these calculate the real and imaginary parts of the scattering length. As a figure of merit of this interaction, we estimate the fidelity to implement a $\sqrt{\text{SWAP}}$ entangling quantum logic gate for two atoms trapped in the same well of an optical lattice. For moderate parameters one can achieve a gate fidelity of $\ensuremath{\sim}95%$ in a time of $\ensuremath{\sim}50\text{ }\ensuremath{\mu}\text{s}$.Nuclear spin exchange occurs in ultracold collisions of fermionic alkaline-earth-metal-like atoms due to a difference between $s$- and $p$-wave phase shifts. We study the use of an optical Feshbach resonance, excited on the ${^{1}S}_{0}\ensuremath{\rightarrow}{^{3}P}_{1}$ intercombination line of $^{171}\text{Y}\text{b}$, to affect a large modification of the $s$-wave scattering phase shift and thereby optically mediate nuclear exchange forces. We perform a full multichannel calculation of the photoassociation resonances and wave functions and from these calculate the real and imaginary parts of the scattering length. As a figure of merit of this interaction, we estimate the fidelity to implement a $\sqrt{\text{SWAP}}$ entangling quantum logic gate for two atoms trapped in the same well of an optical lattice. For moderate parameters one can achieve a gate fidelity of $\ensuremath{\sim}95%$ in a time of $\ensuremath{\sim}50\text{ }\ensuremath{\mu}\text{s}$.

arXiv:0905.4556Physical Review AAug 7, 200927 citations

Controlling Condensate Collapse and Expansion with an Optical Feshbach Resonance

Mi Yan, B. J. DeSalvo, B. Ramachandhran +2 more

We demonstrate control of the collapse and expansion of an (88)Sr Bose-Einstein condensate using an optical Feshbach resonance near the (1)S(0)-(3)P(1) intercombination transition at 689 nm. Significant changes in dynamics are caused by modifications of scattering length by up to ± 10a(bg), where the background scattering length of (88)Sr is a(bg) = -2a(0) (1a(0) = 0.053 nm). Changes in scattering length are monitored through changes in the size of the condensate after a time-of-flight measurement. Because the background scattering length is close to zero, blue detuning of the optical Feshbach resonance laser with respect to a photoassociative resonance leads to increased interaction energy and a faster condensate expansion, whereas red detuning triggers a collapse of the condensate. The results are modeled with the time-dependent nonlinear Gross-Pitaevskii equation.We demonstrate control of the collapse and expansion of an (88)Sr Bose-Einstein condensate using an optical Feshbach resonance near the (1)S(0)-(3)P(1) intercombination transition at 689 nm. Significant changes in dynamics are caused by modifications of scattering length by up to ± 10a(bg), where the background scattering length of (88)Sr is a(bg) = -2a(0) (1a(0) = 0.053 nm). Changes in scattering length are monitored through changes in the size of the condensate after a time-of-flight measurement. Because the background scattering length is close to zero, blue detuning of the optical Feshbach resonance laser with respect to a photoassociative resonance leads to increased interaction energy and a faster condensate expansion, whereas red detuning triggers a collapse of the condensate. The results are modeled with the time-dependent nonlinear Gross-Pitaevskii equation.

arXiv:0906.1837Physical Review LettersMar 20, 2013111 citations

Precision Measurements of Quantum Scattering Phase Shifts and Their Variation Through Feshbach Resonances

Aaron Bennett

Aug 21, 20151 citation

Nuclear spin exchange occurs in ultracold collisions of fermionic alkaline-earth-metal-like atoms due to a difference between

s

- and

p

-wave phase shifts. We study the use of an optical Feshbach resonance, excited on the ${^{1}S}_{0}\ensuremath{\rightarrow}{^{3}P}_{1}$ intercombination line of

^{171}\text{Y}\text{b}

, to affect a large modification of the

s

-wave scattering phase shift and thereby optically mediate nuclear exchange forces. We perform a full multichannel calculation of the photoassociation resonances and wave functions and from these calculate the real and imaginary parts of the scattering length. As a figure of merit of this interaction, we estimate the fidelity to implement a

\sqrt{\text{SWAP}}

entangling quantum logic gate for two atoms trapped in the same well of an optical lattice. For moderate parameters one can achieve a gate fidelity of $\ensuremath{\sim}95%$ in a time of $\ensuremath{\sim}50\text{ }\ensuremath{\mu}\text{s}$.