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<p>This textbook introduces major topics that include quantum bits, superposition, entanglement, logic gates, quantum search algorithm, quantum Fourier transform, inverse quantum Fourier transform, Shor’s order-finding algorithm and phase estimation. Everyone can write algorithms and programs in the cloud making using IBM’s quantum computers that support IBM Q Experience which contains the composer, open quantum assembly language, simulators and real quantum devices. Furthermore, this book teaches you how to use open quantum assembly language to write quantum programs for dealing with complex problems. Through numerous examples and exercises, readers will learn how to write a quantum program with open quantum assembly language for solving any problem from start to complete. </p><p>This book includes six main chapters: </p><p>·<b>Quantum Bits and Quantum Gates</b>—learn what quantum bits are, how to declare and measure them, what quantum gates are and how they work on a simulator or a real device in the cloud. </p>·<b>Boolean Algebra and its Applications</b>—learn how to decompose <b>CCNOT</b> gate into six <b>CNOT</b> gates and nine gates of one bit and how to use <b>NOT </b>gates, <b>CNOT</b> gates and <b>CCNOT</b> gates to implement logic operations including <b>NOT</b>, <b>OR</b>, <b>AND</b>, <b>NOR</b>, <b>NAND</b>, <b>Exclusive</b>-<b>OR</b> (<b>XOR</b>) and <b>Exclusive</b>-<b>NOR</b> (<b>XNOR</b>). <p></p>·<b>Quantum Search Algorithm and its Applications</b>—learn core concepts of quantum search algorithm and how to write quantum programs to implement core concepts of quantum search algorithm for solving two famous <b>NP-complete </b>problems that are the satisfiability problem in <i>n</i> Boolean variables and <i>m</i> clauses and the clique problem in a graph with <i>n</i> vertices and <i>q</i> edges. <p></p>·<b>Quantum Fourier Transform and its Applications</b>—learn core concepts of quantum Fourier transform and inverse quantum Fourier transform and how t