Non-classical correlations between photons and phonons
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CÂRLIG, Sergiu, MACOVEI, Mihai. Non-classical correlations between photons and phonons. 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. 63.
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Materials Science and Condensed Matter Physics
Editia 7, 2014
Conferința "Materials Science and Condensed Matter Physics"
7, Chișinău, Moldova, 16-19 septembrie 2014

Non-classical correlations between photons and phonons


Pag. 63-63

Cârlig Sergiu, Macovei Mihai
 
Institute of Applied Physics, Academy of Sciences of Moldova
 
Disponibil în IBN: 25 februarie 2019


Rezumat

The development of nanotechnologies naturally induces a great interest for nano-mechanical devices. They are particularly promising for ultra-low mass or ultra-small force determinations of order of 1 ’ 10 zg ( z = 10-21 ) or 1 ’ 10 zN, for instance. Furthermore, the combination of existing nano-scale devices and nano-mechanical resonators (NMR) may reveal additional new effects [1]. We discuss a laser-pumped two-level quantum dot, fixed on a semiconductor nano-beam inside an optical leaking resonator (see the Figure). Flexions modify the coupling potential and change the energy levels of the quantum dot. Therefore, there appears a coupling between quantum dot and vibrational phonons. Actually, the system is described using traditional approaches, e.g. the master equation formalism in the dipole, rotating -wave and Born - Markov approximations [2, 3]. In the case when the two-level dot‘s quantum dynamics is faster than others involved subsystems dynamics the whole system can be reduced to a two- mode problem – vibrational and optical ones. Although the environmental temperature directly affects the vibrational degrees of freedom, we found that implicitly it influences the optical degrees of freedom as well. This demonstrates the existence of correlations among these subsystems. Moreover, the corresponding Cauchy-Schwarz inequality violation indicates the quantum nature of those correlations [3]. Finally, there are several techniques for detecting tiny mechanical vibration which in tandem with usual schemes for photons detection may allow the measurement of quantum correlations discussed here.