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[IEEE 2018 2nd International Conference on Trends in Electronics and Informatics (ICOEI) - Tirunelveli (2018.5.11-2018.5.12)] 2018 2nd International Conference on Trends in Electronics and Informatics (ICOEI) - SmartMobiCam: Towards a New Paradigm for Leveraging Smartphone Cameras and IaaS Cloud for Smart City Video Surveillance
摘要： Cloud and mobile computing domains have become quite popular these days. Besides, the ubiquitous smartphones are increasingly becoming a dominant platform for collaborative sensing, so we built an android application SmartMobiCam, which aids in forming the robust and scalable Smart city video surveillance system which is critical for upgrading the urban areas. The application obtains video feed, images and sound clips from the users and then uses cloud services for video enhancement and restoration of the content and provides it to all subscribers including police investigators. The application is explained with detailed architectural and technological choices. Performance analysis shows that the proposed application performs well and outperforms the traditional surveillance system.
关键词： waiting time,video enhancement,Smart city Surveillance,SmartMobiCam,Cloud Mobile Computing
更新于2025-09-23 15:22:29
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Photon Counting Statistics of a Microwave Cavity Coupled with Double Quantum Dots
摘要： The statistical properties of photon emission counting, especially the waiting time distributions (WTDs) and large deviation statistics, of a cavity coupled with the system of double quantum dots (DQDs) driven by an external microwave field were investigated with the particle-number-resolved master equation. The results show that the decay rate of the WTDs of the cavity for short and long time limits can be effectively tuned by the driving external field Rabi frequency, the frequency of the cavity photon, and the detuning between the microwave driving frequency and the energy-splitting of the DQDs. The photon emission energy current will flow from the thermal reservoir to the system of the DQDs when the average photon number of the cavity in a steady state is larger than that of the thermal reservoir; otherwise, the photon emission energy current will flow in the opposite direction. This also demonstrates that the effect of the DQDs can be replaced a thermal reservoir when the rate difference of a photon absorbed and emitted by DQDs is larger than zero; otherwise, it is irreplaceable. The results deepen our understanding of the statistical properties of photon emission counting. It has a promising application in the construction of nanostructured devices of photon emission on demand and of optoelectronic devices.
关键词： large deviation statistics,double quantum dots,waiting time distribution
更新于2025-09-12 10:27:22
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Counting statistics of dark-state transport through a carbon nanotube quantum dot
摘要： In a recent experiment [A. Donarini et al., Nat. Commun. 10, 381 (2019)], electronic transport through a carbon nanotube quantum dot was observed to be suppressed by the formation of a quantum-coherent “dark state.” In this paper we consider theoretically the counting statistics and waiting-time distribution of this dark-state-limited transport. We show that the statistics are characterized by giant super-Poissonian Fano factors and long-tailed waiting-time distributions, both of which are signatures of the bistability and extreme electron bunching caused by the dark state.
关键词： carbon nanotube quantum dot,super-Poissonian Fano factors,dark state,counting statistics,waiting-time distribution
更新于2025-09-12 10:27:22
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Distribution of waiting times between electron cotunneling events
摘要： In the resonant tunneling regime, sequential processes dominate single-electron transport through quantum dots or molecules that are weakly coupled to macroscopic electrodes. In the Coulomb blockade regime, however, cotunneling processes dominate. Cotunneling is an inherently quantum phenomenon and thus gives rise to interesting observations, such as an increase in the current shot noise. Since cotunneling processes are inherently fast compared to the sequential processes, it is of interest to examine the short time behavior of systems where cotunneling plays a role, and whether these systems display nonrenewal statistics. We consider three questions in this paper. Given that an electron has tunneled from the source to the drain via a cotunneling or sequential process, what is the waiting time until another electron cotunnels from the source to the drain? What are the statistical properties of these waiting time intervals? How does cotunneling affect the statistical properties of a system with strong inelastic electron-electron interactions? In answering these questions, we extend the existing formalism for waiting time distributions in single-electron transport to include cotunneling processes via an n-resolved Markovian master equation. We demonstrate that for a single resonant level, the analytic waiting time distribution including cotunneling processes yields information on individual tunneling amplitudes. For both a SRL and an Anderson impurity deep in the Coulomb blockade, there is a nonzero probability for two electrons to cotunnel to the drain with zero waiting time in between. Furthermore, we show that at high voltages, cotunneling processes slightly modify the nonrenewal behavior of an Anderson impurity with a strong inelastic electron-electron interaction.
关键词： waiting time distribution,quantum transport,electron cotunneling,Markovian master equation,Coulomb blockade
更新于2025-09-09 09:28:46