Buening, G. Kleine; Will, J.; Ertmer, W.; Rasel, E.; Arlt, J.; Klempt, C.; et al.: Extended Coherence Time on the Clock Transition of Optically Trapped Rubidium. In: Physical Review Letters 106 (2011), Nr. 24, 240801. DOI:
https://doi.org/10.1103/PhysRevLett.106.240801
Zusammenfassung: |
Optically trapped ensembles are of crucial importance for frequency measurements and quantum memories but generally suffer from strong dephasing due to inhomogeneous density and light shifts. We demonstrate a drastic increase of the coherence time to 21 s on the magnetic field insensitive clock transition of Rb-87 by applying the recently discovered spin self-rephasing [C. Deutsch et al., Phys. Rev. Lett. 105, 020401 (2010)]. This result confirms the general nature of this new mechanism and thus shows its applicability in atom clocks and quantum memories. A systematic investigation of all relevant frequency shifts and noise contributions yields a stability of 2: 4 X 10(-11) tau(-1/2), where tau is the integration time in seconds. Based on a set of technical improvements, the presented frequency standard is predicted to rival the stability of microwave fountain clocks in a potentially much more compact setup.
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Lizenzbestimmungen: |
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Publikationstyp: |
Article |
Publikationsstatus: |
publishedVersion |
Erstveröffentlichung: |
2011 |
Schlagwörter (englisch): |
A-stability, Clock transition, Coherence time, Dephasing, Frequency measurements, Frequency shift, General nature, Inhomogeneous density, Integration time, Light shift, New mechanisms, Noise contributions, Quantum memories, Systematic investigations, Technical improvement, entanglement
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Fachliche Zuordnung (DDC): |
530 | Physik
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