This course introduces the fundamental concepts of quantum communication and computing. Starting from an experimental basis, we will motivate why the classical theory of probability is not able to model certain real physical systems. We will present a generalization of the concept of probability that allows us to model these experiments, as well as their (unexpected) consequences. The new quantum theory of probability will then be used to analyze several simple problems, including the transmission of information, the distribution of quantum entanglement and the teleportation protocol. Finally, the current state of the technology and its future perspectives will be discussed.
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Contents
Unit 1. Introduction: bits versus qubits
1.1. What is a qubit?
1.2. Probability theory
1.3. Bell's theorem
Unit 2. Axioms of quantum mechanics
2.1. Principles of quantum mechanics
2.2. Combined systems: quantum entanglement
2.3. Temporal evolution of a quantum system
2.4. Simulating quantum systems
Unit 3. Quantum communications
3.1. Classical versus quantum information
3.2. Transmission of information over quantum channels
3.3. Teleportation and other communication protocols
3.4. Secure links and quantum cryptography
Unit 4. Quantum computing
4.1. Quantum computers and quantum gates
4.2. Quantum circuits and algorithms
4.3. Programming a quantum computer
4.4. Present and future of quantum computing