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Interaction-induced decay of a heteronuclear two-atom system.

Xu P, Yang J, Liu M, He X, Zeng Y, Wang K, Wang J, Papoular DJ, Shlyapnikov GV, Zhan M - Nat Commun (2015)

Bottom Line: One of the key quantities is the inelastic relaxation (decay) time when one of the atoms or both are in a higher hyperfine state.This experimental method allows us to single out a particular relaxation process thus provides an extremely clean platform for collisional physics studies.Our results have also implications for engineering of quantum states via controlled collisions and creation of two-qubit quantum gates.

View Article: PubMed Central - PubMed

Affiliation: 1] State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, and Wuhan National Laboratory for Optoelectronics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China [2] Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China.

ABSTRACT
Two-atom systems in small traps are of fundamental interest for understanding the role of interactions in degenerate cold gases and for the creation of quantum gates in quantum information processing with single-atom traps. One of the key quantities is the inelastic relaxation (decay) time when one of the atoms or both are in a higher hyperfine state. Here we measure this quantity in a heteronuclear system of (87)Rb and (85)Rb in a micro optical trap and demonstrate experimentally and theoretically the presence of both fast and slow relaxation processes, depending on the choice of the initial hyperfine states. This experimental method allows us to single out a particular relaxation process thus provides an extremely clean platform for collisional physics studies. Our results have also implications for engineering of quantum states via controlled collisions and creation of two-qubit quantum gates.

No MeSH data available.


Related in: MedlinePlus

Calculated rate constants.(a–c) The rate constants αA, αB and αC are calculated at temperatures ranging from 0 to 100 μK, respectively. The black solid curves show the total rate constant, and the red dashed, blue dotted and dark cyan dash–dotted curves show the s-wave, p-wave and d-wave contributions, respectively.
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f6: Calculated rate constants.(a–c) The rate constants αA, αB and αC are calculated at temperatures ranging from 0 to 100 μK, respectively. The black solid curves show the total rate constant, and the red dashed, blue dotted and dark cyan dash–dotted curves show the s-wave, p-wave and d-wave contributions, respectively.

Mentions: In Fig. 6 we present the calculated rate constants at temperatures from 0 to 100 μK and specify the s-wave, p-wave and d-wave contributions (the latter is below 1% at temperatures of our experiment, but at T=100 μK it is 4–5% for the A and B processes, and 10% for the C process). As one can see, the s-wave contribution slowly decreases with increasing temperature. However, the p-wave contribution significantly grows with T, which is expected. The role of the p-wave scattering is especially important for the C process, where it starts to dominate over the s-wave scattering already at T∼15 μK. As a result, the total αC significantly increases with temperature. For the A and B processes the total α does not change much with increasing T as the decrease in the s-wave contribution is compensated by the p-wave contribution.


Interaction-induced decay of a heteronuclear two-atom system.

Xu P, Yang J, Liu M, He X, Zeng Y, Wang K, Wang J, Papoular DJ, Shlyapnikov GV, Zhan M - Nat Commun (2015)

Calculated rate constants.(a–c) The rate constants αA, αB and αC are calculated at temperatures ranging from 0 to 100 μK, respectively. The black solid curves show the total rate constant, and the red dashed, blue dotted and dark cyan dash–dotted curves show the s-wave, p-wave and d-wave contributions, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4525158&req=5

f6: Calculated rate constants.(a–c) The rate constants αA, αB and αC are calculated at temperatures ranging from 0 to 100 μK, respectively. The black solid curves show the total rate constant, and the red dashed, blue dotted and dark cyan dash–dotted curves show the s-wave, p-wave and d-wave contributions, respectively.
Mentions: In Fig. 6 we present the calculated rate constants at temperatures from 0 to 100 μK and specify the s-wave, p-wave and d-wave contributions (the latter is below 1% at temperatures of our experiment, but at T=100 μK it is 4–5% for the A and B processes, and 10% for the C process). As one can see, the s-wave contribution slowly decreases with increasing temperature. However, the p-wave contribution significantly grows with T, which is expected. The role of the p-wave scattering is especially important for the C process, where it starts to dominate over the s-wave scattering already at T∼15 μK. As a result, the total αC significantly increases with temperature. For the A and B processes the total α does not change much with increasing T as the decrease in the s-wave contribution is compensated by the p-wave contribution.

Bottom Line: One of the key quantities is the inelastic relaxation (decay) time when one of the atoms or both are in a higher hyperfine state.This experimental method allows us to single out a particular relaxation process thus provides an extremely clean platform for collisional physics studies.Our results have also implications for engineering of quantum states via controlled collisions and creation of two-qubit quantum gates.

View Article: PubMed Central - PubMed

Affiliation: 1] State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, and Wuhan National Laboratory for Optoelectronics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China [2] Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China.

ABSTRACT
Two-atom systems in small traps are of fundamental interest for understanding the role of interactions in degenerate cold gases and for the creation of quantum gates in quantum information processing with single-atom traps. One of the key quantities is the inelastic relaxation (decay) time when one of the atoms or both are in a higher hyperfine state. Here we measure this quantity in a heteronuclear system of (87)Rb and (85)Rb in a micro optical trap and demonstrate experimentally and theoretically the presence of both fast and slow relaxation processes, depending on the choice of the initial hyperfine states. This experimental method allows us to single out a particular relaxation process thus provides an extremely clean platform for collisional physics studies. Our results have also implications for engineering of quantum states via controlled collisions and creation of two-qubit quantum gates.

No MeSH data available.


Related in: MedlinePlus