Detection of spin coherence in cold atoms via Faraday rotation fluctuations
We report noninvasive detection of spin coherence in a collection of Raman-driven cold atoms using dispersive Faraday rotation fluctuation measurements, which opens possibilities of probing spin correlations in quantum gases and other similar systems. We demonstrate five orders of magnitude enhancem...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2021-12-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.3.043171 |
| _version_ | 1797210870935191552 |
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| author | Maheswar Swar Dibyendu Roy Subhajit Bhar Sanjukta Roy Saptarishi Chaudhuri |
| author_facet | Maheswar Swar Dibyendu Roy Subhajit Bhar Sanjukta Roy Saptarishi Chaudhuri |
| author_sort | Maheswar Swar |
| collection | DOAJ |
| description | We report noninvasive detection of spin coherence in a collection of Raman-driven cold atoms using dispersive Faraday rotation fluctuation measurements, which opens possibilities of probing spin correlations in quantum gases and other similar systems. We demonstrate five orders of magnitude enhancement of the measured signal strength as compared to traditional spin noise spectroscopy with thermal atoms in equilibrium. Our observations are in good agreement with the comprehensive theoretical modeling of the driven atoms at various temperatures. The extracted spin relaxation rate of cold rubidium atoms with atom number density ∼10^{9}/cm^{3} is of the order of 3×10^{3}s^{−1} at 150 μK, two orders of magnitude less than 3×10^{5}s^{−1} of that of a thermal atomic vapor with atom number density ∼10^{12}/cm^{3} at 373 K. |
| first_indexed | 2024-04-24T10:17:28Z |
| format | Article |
| id | doaj.art-9a18662526fd4c7e84be363a0043b6db |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:17:28Z |
| publishDate | 2021-12-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-9a18662526fd4c7e84be363a0043b6db2024-04-12T17:16:15ZengAmerican Physical SocietyPhysical Review Research2643-15642021-12-013404317110.1103/PhysRevResearch.3.043171Detection of spin coherence in cold atoms via Faraday rotation fluctuationsMaheswar SwarDibyendu RoySubhajit BharSanjukta RoySaptarishi ChaudhuriWe report noninvasive detection of spin coherence in a collection of Raman-driven cold atoms using dispersive Faraday rotation fluctuation measurements, which opens possibilities of probing spin correlations in quantum gases and other similar systems. We demonstrate five orders of magnitude enhancement of the measured signal strength as compared to traditional spin noise spectroscopy with thermal atoms in equilibrium. Our observations are in good agreement with the comprehensive theoretical modeling of the driven atoms at various temperatures. The extracted spin relaxation rate of cold rubidium atoms with atom number density ∼10^{9}/cm^{3} is of the order of 3×10^{3}s^{−1} at 150 μK, two orders of magnitude less than 3×10^{5}s^{−1} of that of a thermal atomic vapor with atom number density ∼10^{12}/cm^{3} at 373 K.http://doi.org/10.1103/PhysRevResearch.3.043171 |
| spellingShingle | Maheswar Swar Dibyendu Roy Subhajit Bhar Sanjukta Roy Saptarishi Chaudhuri Detection of spin coherence in cold atoms via Faraday rotation fluctuations Physical Review Research |
| title | Detection of spin coherence in cold atoms via Faraday rotation fluctuations |
| title_full | Detection of spin coherence in cold atoms via Faraday rotation fluctuations |
| title_fullStr | Detection of spin coherence in cold atoms via Faraday rotation fluctuations |
| title_full_unstemmed | Detection of spin coherence in cold atoms via Faraday rotation fluctuations |
| title_short | Detection of spin coherence in cold atoms via Faraday rotation fluctuations |
| title_sort | detection of spin coherence in cold atoms via faraday rotation fluctuations |
| url | http://doi.org/10.1103/PhysRevResearch.3.043171 |
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