Tham khảo tài liệu 'applications of high tc superconductivity part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Some Contemporary and Prospective Applications of High Temperature Superconductors 29 Fig. 10. The intrinsic Josephson plasma resonance frequency versus temperature curves and fitting functions for both the optimally and over oxygen doped mercury cuprates. above 77K. So it has been concluded that the excess oxygen only affects the starting temperature of emission of coherent terahertz wave in the superconducting system. 4. Intrinsic Quantum Bit Qubit operations with mercury cuprate high temperature superconductors Introduction to quantum computers and qubit In recent years quantum computers have an increasing attention due to their both high speed and memory capacity. As is known that quantum computers are completely different from the classical computers which are based on the standard semiconductor transistor technology. While classical bit is used in the classical computers the quantum bit namely qubit which can carry two quantum states at the same time is used in the quantum computers. Quantum computers are operated by some quantum mechanical phenomena such as quantum superposition quantum entanglement and quantum teleportation. A quantum computer maintains a sequence of qubits. A single qubit is represented by 10 n or crucially any quantum superposition of these states. The quantum superposition of these orthogonal states is defined by k C1I0 c2 1 5 The squares of the complex coefficients c12 and c22 represent the probabilities for finding the particle in the corresponding states. Pair of qubits can be in any quantum superposition of 4 30 Applications of High-Tc Superconductivity 22 states and three qubits in any superposition of 8 23 states etc. While for the classical computer one of these states has the probability of 1 for the quantum computer the sum of the probabilities of these states equals to 1 . In this point of view quantum superposition allows a particle to be in two or more quantum states at the same time. So that the quantum computation is a
