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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

Spin-relaxation measurement.We first prepare a single 87Rb atom in the state F1=1 (black squares) or F1=2 (red circles). After a time t we kick out atoms that are populated in the state F1=2 by using a resonant laser and then detect the survival probability of single atoms. Each data is averaged over 300 single atoms. The solid curves show a fit by the exponential formula: dP/dt∝exp(∓t/τr −t/τs), where the sign − is related to the black curve, the sign + to the red one, and the single-atom loss time is τs=11,000 ms. The fitted spin-relaxation time is τr=1,100±150 ms.
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f4: Spin-relaxation measurement.We first prepare a single 87Rb atom in the state F1=1 (black squares) or F1=2 (red circles). After a time t we kick out atoms that are populated in the state F1=2 by using a resonant laser and then detect the survival probability of single atoms. Each data is averaged over 300 single atoms. The solid curves show a fit by the exponential formula: dP/dt∝exp(∓t/τr −t/τs), where the sign − is related to the black curve, the sign + to the red one, and the single-atom loss time is τs=11,000 ms. The fitted spin-relaxation time is τr=1,100±150 ms.

Mentions: We do not include single-atom loss in the rate equations, as the related loss time is about 11 s and it changes the simulated survival probability by <2% even at times t approaching 1,000 ms. For the time of single-atom spin relaxation we did an independent measurement, and the measured value is τr=1,100±150 ms (see Fig. 4).


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)

Spin-relaxation measurement.We first prepare a single 87Rb atom in the state F1=1 (black squares) or F1=2 (red circles). After a time t we kick out atoms that are populated in the state F1=2 by using a resonant laser and then detect the survival probability of single atoms. Each data is averaged over 300 single atoms. The solid curves show a fit by the exponential formula: dP/dt∝exp(∓t/τr −t/τs), where the sign − is related to the black curve, the sign + to the red one, and the single-atom loss time is τs=11,000 ms. The fitted spin-relaxation time is τr=1,100±150 ms.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: Spin-relaxation measurement.We first prepare a single 87Rb atom in the state F1=1 (black squares) or F1=2 (red circles). After a time t we kick out atoms that are populated in the state F1=2 by using a resonant laser and then detect the survival probability of single atoms. Each data is averaged over 300 single atoms. The solid curves show a fit by the exponential formula: dP/dt∝exp(∓t/τr −t/τs), where the sign − is related to the black curve, the sign + to the red one, and the single-atom loss time is τs=11,000 ms. The fitted spin-relaxation time is τr=1,100±150 ms.
Mentions: We do not include single-atom loss in the rate equations, as the related loss time is about 11 s and it changes the simulated survival probability by <2% even at times t approaching 1,000 ms. For the time of single-atom spin relaxation we did an independent measurement, and the measured value is τr=1,100±150 ms (see Fig. 4).

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