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Memory and Entanglement Assisted Secure Quantum Key Distribution
, M.Sc. Thesis Sharif University of Technology ; Salehi, Jawad (Supervisor)
Abstract
Two major category of protocols suggested for quantum key distribution (QKD) are prepare and measure protocols and entanglement based protocols. One of the most challenging problem of these two categories is that they are not immune against attacks to measurement devices. For addressing this problem, measurement device independent protocol (MDI-QKD) was proposed in 2012; in which measurement device can be in hands of untrusted party. The idea of MDI-QKD is based on time-reversed EPR protocol. Still low secure key exchange rate has provoked many efforts, one of these efforts was to improve the key rate by means of quantum memories. In this thesis different proposed structures for memory...
Statistical distribution of intensity fluctuations for underwater wireless optical channels in the presence of air bubbles
, Article IWCIT 2016 - Iran Workshop on Communication and Information Theory, 3 May 2016 through 4 May 2016 ; 2016 ; 9781509019229 (ISBN) ; Khorramshahi, P ; Tashakori, A ; Chizari, A ; Shahsavari, S ; Abdollahramezani, S ; Fazelian, M ; Bahrani, S ; Salehi, J. A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
In this paper, we experimentally investigate the statistical distribution of intensity fluctuations for underwater wireless optical channels under different channel conditions, namely fresh and salty underwater channels with and without air bubbles. To do so, we first measure the received optical signal with a large number of samples. Based on the normalized acquired data the channel coherence time and the fluctuations probability density function (PDF) are obtained for different channel scenarios. Our experimental results show that salt attenuates the received signal while air bubbles mainly introduce severe intensity fluctuations. Moreover, we observe that log-normal distribution precisely...
Mining DNA sequences based on spatially coded technique using spatial light modulator
, Article IWCIT 2016 - Iran Workshop on Communication and Information Theory, 3 May 2016 through 4 May 2016 ; 2016 ; 9781509019229 (ISBN) ; Abdollahramezani, S ; Bahrani, S ; Chizari, A ; Jamali, M. V ; Khorramshahi, P ; Tashakori, A ; Shahsavari, S ; Salehi, J. A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
In this paper, we present an optical computing method for string data alignment applicable to genome information analysis. By applying moire technique to spatial encoding patterns of deoxyribonucleic acid (DNA) sequences, association information of the genome and the expressed phenotypes could more effectively be extracted. Such moire fringes reveal occurrence of matching, deletion and insertion between DNA sequences providing useful visualized information for prediction of gene function and classification of species. Furthermore, by applying a cylindrical lens, a new technique is proposed to map two-dimensional (2D) association information to a one-dimensional (1D) column of pixels, where...