One of the most emerging techniques now a day is web service. The web service (WS) is provided by an international standard called World Wide Web Consortium (W3C). The communication between the systems in the network is enhanced by this service. Cloud computing (CC) provides better improvement in the functionality of WS. The CC hides the complex information's such as storage, network, and host details from the customers and gives easier environment to work. Even though several systems such as Amazon EC2, Microsoft Azure, and Google Application Engine (GAE) etc have evolved over time .They have its own challenges and issues. This survey gives an overview regarding some issues in cloud computing.
Quantum computing is a fascinating topic, and the authors attempt to give a detailed explanation about the history of quantum computing, double slit experiment, introduction about quantum computers, quantum super position, quantum entanglement, overview about quantum supremacy, building quantum computing, single bit gates, multi-bit gates, model of quantum computing with applications, and case study. The quantum computing was developed using quantum algorithms and quantum devices. Firstly, the quantum algorithms are developed as mathematical models, and the performance is evaluated through simulations, algebraic algorithms (cryptography, Diffie-Hellman, shor algorithm, for RSA) and amplitude amplification (database searching, pattern matching, etc.). Secondly, the quantum devices are the original physical devices built with optical connections instead of electrical connections. The qubit control uses the microwave for superconducting, laser, quantum dots, and photonics (optical instrument).
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