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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

The decay under different conditions.(a,b) Survival probability P versus time t for the B and A collisions, respectively. The black squares are experimental data collected at the trap depth U0=0.6 mK, with each point being the result from 300 repeated measurements. The solid curves show a fit by the formula P=w exp(−t/τ)+w0, and the error in the decay time indicates the s.d. when using the fit of P(t) by the exponential formula. In (a) The measurements are done for the survival probability of 85Rb after kicking out 87Rb, and the initial temperatures are T87=35±3 μK and T85=15±1 μK. In (b) 85Rb is kicked out, and the survival probability of 87Rb is measured with the initial temperatures T87=47±3 μK and T85=27±2 μK.
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f3: The decay under different conditions.(a,b) Survival probability P versus time t for the B and A collisions, respectively. The black squares are experimental data collected at the trap depth U0=0.6 mK, with each point being the result from 300 repeated measurements. The solid curves show a fit by the formula P=w exp(−t/τ)+w0, and the error in the decay time indicates the s.d. when using the fit of P(t) by the exponential formula. In (a) The measurements are done for the survival probability of 85Rb after kicking out 87Rb, and the initial temperatures are T87=35±3 μK and T85=15±1 μK. In (b) 85Rb is kicked out, and the survival probability of 87Rb is measured with the initial temperatures T87=47±3 μK and T85=27±2 μK.

Mentions: We also test that the result for τ does not depend on whether we kick out 85Rb or 87Rb for measuring P(t). Comparing Fig. 2c with Fig. 3a it is easy to conclude that not only relaxation times are very close to each other (see also Table 1) but also the functions P(t). We then vary the temperature for the A collisional process to test the dependence of τ on the effective volume (density) of atoms in the trap. As expected, the time τ increases with temperature and one can see this from the comparison of the results in Figs 2b and 3b.


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)

The decay under different conditions.(a,b) Survival probability P versus time t for the B and A collisions, respectively. The black squares are experimental data collected at the trap depth U0=0.6 mK, with each point being the result from 300 repeated measurements. The solid curves show a fit by the formula P=w exp(−t/τ)+w0, and the error in the decay time indicates the s.d. when using the fit of P(t) by the exponential formula. In (a) The measurements are done for the survival probability of 85Rb after kicking out 87Rb, and the initial temperatures are T87=35±3 μK and T85=15±1 μK. In (b) 85Rb is kicked out, and the survival probability of 87Rb is measured with the initial temperatures T87=47±3 μK and T85=27±2 μK.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: The decay under different conditions.(a,b) Survival probability P versus time t for the B and A collisions, respectively. The black squares are experimental data collected at the trap depth U0=0.6 mK, with each point being the result from 300 repeated measurements. The solid curves show a fit by the formula P=w exp(−t/τ)+w0, and the error in the decay time indicates the s.d. when using the fit of P(t) by the exponential formula. In (a) The measurements are done for the survival probability of 85Rb after kicking out 87Rb, and the initial temperatures are T87=35±3 μK and T85=15±1 μK. In (b) 85Rb is kicked out, and the survival probability of 87Rb is measured with the initial temperatures T87=47±3 μK and T85=27±2 μK.
Mentions: We also test that the result for τ does not depend on whether we kick out 85Rb or 87Rb for measuring P(t). Comparing Fig. 2c with Fig. 3a it is easy to conclude that not only relaxation times are very close to each other (see also Table 1) but also the functions P(t). We then vary the temperature for the A collisional process to test the dependence of τ on the effective volume (density) of atoms in the trap. As expected, the time τ increases with temperature and one can see this from the comparison of the results in Figs 2b and 3b.

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