Influence of phonon reservoir on photon blockade in a driven quantum dot-cavity system

• Published in: Journal of applied physics 2016-03, Vol.119 (10)
• Main Authors: Gao, Bo, Zhu, Jia-pei, Li, Gao-xiang
• Format: Article
• Language: English
• Subjects: Applied physics; CAVITIES; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CORRELATION FUNCTIONS; Electron phonon interactions; ELECTRON-PHONON COUPLING; EXCITATION; INTERFERENCE; PHONONS; PHOTONS; QUANTUM DOTS
• ISSN: 0021-8979; 1089-7550
• DOI: 10.1063/1.4943644

We theoretically investigate the influence of the phonon bath on photon blockade in a simultaneously driven dot-cavity system. An optimal condition for avoiding two-photon excitation of a cavity field is put forward which can be achieved by modulating the phase difference and the strengths of the driving fields. The second-order correlation function and the mean photon number of the cavity field are discussed. In the absence of phonon effect, the strong photon blockade in a moderate quantum dot (QD)-cavity coupling regime occurs, which can be attributed to the destructive quantum interference arisen from different transition paths induced by simultaneously driving the dressed QD-cavity system. The participation of acoustic-phonon reservoir produces new transition channels for the QD-cavity system, which leads to the damage of destructive interference. As a result, the photon blockade effect is hindered when taking the electron-phonon interaction into account. It is also found that the temperature of the phonon reservoir is disadvantageous for the generation of photon blockade.