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SM ISO690:2012 CÂRLIG, Sergiu, MACOVEI, Mihai. Correlated quantum cooling of a nanomechanical resonator. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 78. |
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Materials Science and Condensed Matter Physics Editia 7, 2014 |
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Conferința "Materials Science and Condensed Matter Physics" 7, Chișinău, Moldova, 16-19 septembrie 2014 | |||||
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Pag. 78-78 | |||||
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Nanomechanical resonators (NMR) are indispensable elements for ultra-sensitive measurements and their investigations have a constant increasing interest [1]. Here, we discuss a regime when cooling of a nanomechanical resonator is correlated with emission processes of a pumped quantum dot which is fixed on it (see the Figure). Therefore, the maximum number of detected photons corresponds to the minimum number of phonons. The investigated system consists of a two-level quantum dot pumped by an external laser field, and fixed on a nano-beam suspended inside a cavity. If the quantum dot dynamic is faster than cavity or beam dynamics, respectively, then laser photon and phonon absorptions are accompanied by the emission of a photon in the cavity mode. Therefore, the detection of photons leaking from the cavity implies NMR cooling. Particularly, we have obtained the analytical expressions for the mean numbers of photons and phonons basing on the master equation formalism, and described the method‘s efficiency. Furthermore, we found efficient cooling even at higher environmental temperatures [2]. |
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