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Search Results: 1 - 10 of 395 matches for " Zafer Gedik "
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Stability of Flip and Exchange Symmetric Entangled State Classes under Invertible Local Operations
Zafer Gedik
Physics , 2009, DOI: 10.1016/j.optcom.2010.09.041
Abstract: Flip and exchange symmetric (FES) many-qubit states, which can be obtained from a state with the same symmetries by means of invertible local operations (ILO), constitute a one-parameter family of curves in the Hilbert space. Eigenstates of FES ILOs correspond to vectors that cannot be transformed to other FES states. This means equivalence classes of states under ILO can be determined in a systematic way for an arbitrary number of qubits. More important, for entangled states, at the boundaries of neighboring equivalence classes, one can show that when the fidelity between the final state after an ILO and a state of the neighboring class approaches unity, probability of success decreases to zero. Therefore, the classes are stable under ILOs.
Spin Bath Decoherence of Quantum Entanglement
Zafer Gedik
Physics , 2005, DOI: 10.1016/j.ssc.2006.02.004
Abstract: We study an analytically solvable model for decoherence of a two spin system embedded in a large spin environment. As a measure of entanglement, we evaluate the concurrence for the Bell states (Einstein-Podolsky-Rosen pairs). We find that while for two separate spin baths all four Bell states lose their coherence with the same time dependence, for a common spin bath, two of the states decay faster than the others. We explain this difference by the relative orientation of the individual spins in the pair. We also examine how the Bell inequality is violated in the coherent regime. Both for one bath and two bath cases, we find that while two of the Bell states always obey the inequality, the other two initially violates the inequality at early times.
Quantum Entanglement and Order Parameter in a Paired Finite Fermi System
Zafer Gedik
Physics , 2002, DOI: 10.1016/S0038-1098(02)00551-3
Abstract: We study the pairing correlations in a finite Fermi system from quantum entanglement point of view. We investigate the relation between the order parameter, which has been introduced recently to describe both finite and infinite superconductors, and the concurrence. For a proper definition of the concurrence, we argue that a possible generalization of spin flip transformation is time reversal operation. While for a system with indefinite number of particles concurrence is a good measure of entanglement, for a finite system it does not distinguish between normal and superconducting states. We propose that the expectation value of the radial operator for the total pseudospin can be used to identify entanglement of pairing.
Quantum Phase in Nanoscopic Superconductors
Zafer Gedik
Physics , 2003,
Abstract: Using the pseudospin representation and the SU(2) phase operators we introduce a complex parameter to characterize both infinite and finite superconducting systems. While in the bulk limit the parameter becomes identical to the conventional order parameter, in the nanoscopic limit its modulus reduces to the number parity effect parameter and its phase takes discrete values. We evaluate the Josephson coupling energy and show that in bulk superconductor it reproduces the conventional expression and in the nanoscopic limit it leads to quantized Josephson effect. Finally, we study the phase flow or dual Josephson effect in a superconductor with fixed number of electrons.
Perceptions of War and The Solutions of Mothers of Martyrs in Turkey
Esra Gedik
Fe Dergi : Feminist Ele?tiri , 2009,
Abstract: In this study, I want to evaluate mothers of martyrs’ perception of the war and solution while to protect its citizens is the state duty, with the assumption of questioning their son's death, whether they can transform being a mother of a martyr into anti-war women as women examples in the world we have seen. Obviously, as the martyr's mother, these women have acquired new identities. Nevertheless, how the above-mentioned attitude of questioning motherhood is limited by what the different discourses? As a result, these women, mothers of martyrs, are to remain silent. In this context, throughout my research, as previously mentioned, these women in Turkey have been represented, as a mother of a martyr, will be reviewed.
Eigenvalue Formulation of Quantum Mechanics Near Closed Timelike Curves
Z. Gedik
Physics , 2012,
Abstract: Einstein's field equations of gravitation are known to admit closed timelike curve (CTC) solutions. Deutsch approached the problem from the quantum information point of view and proposed a self-consistency condition. In this work, the Deutsch equation is formulated as an eigenvalue problem. The disappearance of entanglement between two qubits in an Einstein-Podolsky-Rosen (EPR) state near a CTC is demonstrated. The method is utilized to analyze the discontinuous evolution of two chronology respecting (CR) qubits near a CTC.
Automated Routing Control System of Local Area Network Segment  [PDF]
Zafer Al-Makhadmee
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53030

Automated Routing Control System supersedes the prior approach to LAN redundancy which provides two or more LANs and each has a network (LAN) controller coupled to data communication devices. Devices require some software to switch between the network (LAN) controllers to counter some network segment failures. This approach is proven to be very costly due to demands for off-the-shelf data communication devices with built-in LAN controller drivers [1]. Automated Routing Control System, is the ultimate solution to the growing demands for inexpensive (less costly) and less difficult approach which requires less modification rather than upgrade of network devices yet it minimizes data and information exchange losses and interruptions caused by connection failures within the network and lessens the task of managing a complex network having many segments rather than subnets under a centralized monitoring and management. Automated Routing Control System rather than mechanism is a realistic approach applied to meet the ever growing demands for reliability, high efficiency and availability within data and information exchange networks.

Nomograms as Predictive Tools for Prostate Cancer Patients Who Had Radical Prostatectomy  [PDF]
Saadettin Eskicorapci, Cenk Acar, Zafer Sinik, Zafer Aybek, Michael Kattanb
Open Journal of Urology (OJU) , 2011, DOI: 10.4236/oju.2011.13009
Abstract: Prostate cancer is the most common solid cancer for men in the developed countries. Radical prostatectomy is the most preferred treatment modality for localized prostate cancer. Individual decision making is necessary for each patient because of the diversities in the biological characteristics of the prostate cancer. The prediction of pathologic stage, prognosis and cancer specific mortality after curative therapy and quality of life issues are essential for counseling and tailoring treatment in possible candidates of radical prostatectomy. Several studies demonstrated that nomograms are the best predictive tools regarding the other prediction models. For better understanding the nomograms in radical prostatectomy patients, they should be classified according to categories for their use. PSA, Gleason grade and clinical stage are seemed to be the most important prognostic factors in patients who are candidates for radical prostatectomy. Additionally, the pathological parameters are remarkable prognostic criteria. The Partin tables for predicting the radical prostatectomy pathology and Kattan nomograms for predicting the biochemical recurrences free survival rates are the most frequently used nomograms. Today, these nomograms should not replace the clinical decisions but they give significant information for the patients’ prognosis, treatment selection and follow up.
Oscillation of Second-Order Sublinear Impulsive Differential Equations
A. Zafer
Abstract and Applied Analysis , 2011, DOI: 10.1155/2011/458275
Abstract: Oscillation criteria obtained by Kusano and Onose (1973) and by Belohorec (1969) are extended to second-order sublinear impulsive differential equations of Emden-Fowler type: ′′()
Stability of Difference Schemes for Fractional Parabolic PDE with the Dirichlet-Neumann Conditions
Zafer Cakir
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/463746
Abstract: The stable difference schemes for the fractional parabolic equation with Dirichlet and Neumannboundary conditions are presented. Stability estimates and almost coercive stability estimates with ln (1/(
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