Non-classical properties and generation schemes of superposition of multiple-photon-added two-mode squeezed vacuum state

In this paper, we study some non-classical properties and propose the generation schemes of the superposition of multiple-photon-added two-mode squeezed vacuum state (SMPA-TMSVS). Based on the   Wigner function, we clarify that this state is a non-Gaussian state, while the original two-mode squeezed vacuum state (TMSVS) is a Gaussian state. Besides, the SMPA-TMSVS is sum squeezing, as well as difference squeezing. In particular, the manifestation of the sum squeezing and the difference squeezing in the SMPA-TMSVS becomes more pronounced when increasing parameters r and e. In addition, by exploiting the schemes of photon-added superposition in the usual order, we give some schemes that the SMPA-TMSVS can be generated with the higher-order photon-added superposition by using some optical devices

ROBUST DYNAMIC ID-BASED REMOTE MUTUAL AUTHENTICATION SCHEME

Dynamic ID based authentication scheme is more and more important in insecure wireless environment and system. Two of kinds of attack that authentication schemes must resist are stealing identity and reflection attack which is a potential way of attacking a challenge- response authentication system using the same protocol in both direc­tions. It must be guaranteed to prevent attackers from reusing informa­tion from authentication phase and the scheme of Yoon and Yoo satisfies those requirements. However, their scheme can not resist insider and impersonation attack by using lost or stolen smart card. In this paper, we demonstrate that Yoon and Yoo’s scheme is still vulnerable to those attacks. Then, we present an improvement to their scheme in order to isolate such problems

QUANTUM TELEPORTATION OF ENTANGLED STATES VIA GENERALIZED PHOTON-ADDED PAIR COHERENT STATE

In this paper, we study the quantum teleportation of an unknown atomic state based on the two-photon Jaynes-Cummings model, consisting of an effective two-level atom with a two-mode field in the generalized photon-added pair coherent state (GPAPCS). By applying the detecting method, we use a scheme that includes two two-level atoms and a cavity field to teleport the unknown atomic state from a sender to a receiver. The results show that the number of photons added to the field and the intensity of the initial field influence the average fidelity and success probability of the teleportation process. The time-evolution dependence of the average fidelity is also considered and compared for the field in the pair coherent state and in the GPAPCS

CÁC TÍNH CHẤT ĐỘNG LƯỢNG TỬ CỦA TRẠNG THÁI KẾT HỢP BỘ BA THÊM PHOTON TRONG MÔ HÌNH JAYNES-CUMMINGS HAI MODE

In this paper, we studied the quantum dynamic properties via the two-mode Jaynes-Cummings (JC) model where an effective two-level atom interacts with a field in a photon-added trio coherent state (PATCS). The quantum dynamic properties of the atom and the field were investigated via the photon distribution function, the second-order correlation function of the same and different modes, and the probability of finding the atom in the excited state in the cavity. The results show the dynamic properties of the atom and the non-classical ones of the field in the PATCS. In addition to the factors that affect these dynamic properties, such as the original field strength, the role of adding photons to the modes of the field in the PATCS is important when compared with the field in the original state as the trio coherent state.Trong bài báo này, chúng tôi nghiên cứu các tính chất động lượng tử thông qua mô hình Jaynes-Cummings (JC) hai mode, trong đó một nguyên tử hai mức hiệu dụng tương tác với trường ở trạng thái kết hợp bộ ba thêm photon (PATCS). Các tính chất động lượng tử của nguyên tử và trường ở PATCS đã được khảo sát thông qua các hàm phân bố photon, các hàm tương quan bậc hai cùng mode và khác mode và hàm xác suất tìm nguyên tử ở trạng thái kích thích trong hốc cộng hưởng. Các kết quả khảo sát đã chỉ ra các tính chất động của nguyên tử và tính phi cổ điển của trường ở PATCS. Ngoài các yếu tố ảnh hưởng đến các tính chất động trên như cường độ trường ban đầu thì vai trò của việc thêm photon vào các mode của trường ở PATCS là rất quan trọng khi so sánh với trường ở trạng thái gốc ban đầu là trạng thái kết hợp bộ ba

Entanglement Criterion for Bipartite Quantum States: Applications

In this paper, we use a criterion provided by E. Shchukin and W. Vogel [Phys. Rev. Lett. 95, 230502 (2005)] for determining when a bipartite quantum state is entangled. We first show that the entanglement criterion is necessary and sufficient condition for the partial transposition of the bipartite quantum states. Furthermore, previously known entanglement criteria are proved to be special cases of this criterion. We then apply the entanglement criterion to determine entangled property of several non-classical two-mode states. Finally, we provide the conclusion about this criterion

Identify aerodynamic derivatives of the airplane attitude channel using a spiking neural network

The paper proposes a method for identifying aerodynamic coefficient derivatives of aircraft attitude channel using spiking neural network (SNN) and Gauss-Newton algorithm based on data obtained from actual flights. Using SNN combination with Gauss-Newton iterative calculation algorithm allows the identification of aerodynamic coefficient derivatives in a nonlinear model for aerodynamic parameters with higher accuracy and faster calculation time. The paper proposes an algorithm to train the SNN multi-layer network by Normalized Spiking Error Back Propagation (NSEBP), in which, in the forward propagation period, the time of output spikes is calculating by solving quadratic equations instead of detection by traditional methods. The phase of propagation of errors backward uses the step-by-step calculation instead of the conventional gradient calculation method. The identification results are compared with the results when using the RBN network to prove the algorithm efficienc