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marvian-mashhad--milad
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Analysis of Quantum Secret Sharing Protocols
, M.Sc. Thesis Sharif University of Technology ; Aref, Mohammad Reza (Supervisor) ; Karimipour, Vahid (Supervisor)
Abstract
Quantum cryptography can provide complete security. Using the quantum mechanics postulates, we can achieve a provable security which is not possible in classical cryptography. When the first completely secure protocol for distributing key was introduced, it turned a great deal of attention toward quantum cryptography and researcher focused on finding quantum mechanical counterpart of other classical cryptographic protocols. Among these protocols, quantum secret sharing is one of the most useful and important ones. In this thesis, first we introduce the basic postulates of quantum mechanics. Then, we introduce some known quantum secret sharing protocols and discuss their properties and...
Secure data transmission using qubits
, Article 6th IEEE International Conference on Computer and Information Technology, CIT 2006, Seoul, 20 September 2006 through 22 September 2006 ; 2006 ; 076952687X (ISBN); 9780769526874 (ISBN) ; Hosseini Khayat, S ; Sharif University of Technology
2006
Abstract
A quantum protocol for secure transmission of data using qubits is presented. This protocol sends one qubit in a round-trip to transmit one bit of data. The protocol offers an improvement over the BB84 QKD protocol. BB84, in conjunction with one-time pad encryption, has been shown to be unconditionally secure. However its security relies on the assumption that the qubit source device does not emit multiple replicas of the same qubit for each transmitted bit. If this happens a multi-qubit emission attack can be launched. In addition, BB84 cannot be used to send predetermined bit strings as it generates a random bit string in the process. Our protocol does not have the above drawbacks, but...
Threshold distances for transmission of EPR pairs through Pauli channels
, Article Physics Letters, Section A: General, Atomic and Solid State Physics ; Volume 355, Issue 2 , 2006 , Pages 81-86 ; 03759601 (ISSN) ; Karimipour, V ; Marvian, I ; Sharif University of Technology
Elsevier
2006
Abstract
Assuming that Pauli channels simulate the effect of optical fibers on polarization entangled photons we theoretically find the threshold distance beyond which such pairs loose their entanglement. From the current experimental data and by taking into account all other loss factors, like absorption, we give estimates for these threshold distances. © 2006 Elsevier B.V. All rights reserved
Feedback acquisition and reconstruction of spectrum-sparse signals by predictive level comparisons
, Article IEEE Signal Processing Letters ; Volume 25, Issue 4 , 2018 , Pages 496-500 ; 10709908 (ISSN) ; Gazor, S ; Rahnavard, N ; Marvasti, F ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
In this letter, we propose a sparsity promoting feedback acquisition and reconstruction scheme for sensing, encoding and subsequent reconstruction of spectrally sparse signals. In the proposed scheme, the spectral components are estimated utilizing a sparsity-promoting, sliding-window algorithm in a feedback loop. Utilizing the estimated spectral components, a level signal is predicted and sign measurements of the prediction error are acquired. The sparsity promoting algorithm can then estimate the spectral components iteratively from the sign measurements. Unlike many batch-based compressive sensing algorithms, our proposed algorithm gradually estimates and follows slow changes in the...
Does the short-term boost of renewable energies guarantee their stable long-term growth? Assessment of the dynamics of feed-in tariff policy
, Article Renewable Energy ; Volume 159 , October , 2020 , Pages 1252-1268 ; Hamed Shakouri, G ; Mashayekhi, A. N ; Kazemi, A ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Feed-in tariff (FiT) is one of the most efficient ways that many governments throughout the world use to stimulate investment in renewable energies (REs) technology. For governments, financial management of the policy could be challenging as it needs a considerable amount of budget to support RE producers during the long remuneration period. In this paper, it has been illuminated that the early growth of REs capacity could be a temporary boost. And the socio-economic structure of the system will backlash the policy if some social mechanisms are not considered. Social tolerance for paying REs tax and potential investors’ trust emanated from budget-related mechanisms -which have rarely been...