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Practical Design for Improving the Sensitivity to Search for Dark Matter Axions with Rydberg Atoms |
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| Authors: | M Shibata T Arai A Fukuda H Funahashi T Haseyama S Ikeda K Imai Y Isozumi T Kato Y Kido A Matsubara S Matsuki T Mizusaki R Nakanishi T Nishimura D Ohsawa A Sawada Y Takahashi M Tosaki S Yamada K Yamamoto |
| Affiliation: | (1) KEK, Tsukuba 305-0801, Japan;(2) Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8502, Japan;(3) Osaka Electro-Communication University, Osaka 572-8530, Japan;(4) Japan Laser Corporation, Co. Ltd, Shinjuku, Tokyo 169-0051, Japan;(5) Department of Physics, Kyoto University, Kyoto 606-8502, Japan;(6) Radioisotope Research Center, Kyoto University, Kyoto 606-8501, Japan;(7) Department of Physics, Ritsumeikan University, Shiga 525-8577, Japan;(8) Research Organization of Science and Engineering, Ritsumeikan University, Shiga 525-8577, Japan;(9) Kamioka Observatory, ICRR, University of Tokyo, Kamioka 506-1025, Japan;(10) Department of Nuclear Engineering, Kyoto University, Kyoto 606-8501, Japan |
| Abstract: | A microwave single-photon detector was developed with highly-excited alkaline Rydberg-atoms in a cooled resonant cavity to search for dark matter axions. This detector belongs to a microwave single-photon counter, thus being free from the standard quantum limit (SQL). High sensitivity of the present detector system was demonstrated by measuring the thermal blackbody radiations in the cavity at temperatures as low as 70 mK where the sensitivity is below the SQL. The detection sensitivity of the present system is mainly limited by stray electric fields present in the detection region. Practical design of a new experimental scheme with a guiding electric field through the atomic-beam trajectory is here presented and discussed to avoid the effect of stray electric field and thus to improve the detection sensitivity. |
| Keywords: | Microwave single-photon detector Rydberg atoms Dark matter axions Cryogenic particle detector |
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