Jed Brody – författare

An exploration of quantum entanglement and the ways in which it contradicts our everyday assumptions about the ultimate nature of reality.Quantum physics is notable for its brazen defiance of common sense. (Think of Schrödinger's Cat, famously both dead and alive.) An especially rigorous form of quantum contradiction occurs in experiments with entangled particles. Our common assumption is that objects have properties whether or not anyone is observing them, and the measurement of one can't affect the other. Quantum entanglement—called by Einstein “spooky action at a distance”—rejects this assumption, offering impeccable reasoning and irrefutable evidence of the opposite. Is quantum entanglement mystical, or just mystifying? In this volume in the MIT Press Essential Knowledge series, Jed Brody equips readers to decide for themselves. He explains how our commonsense assumptions impose constraints—from which entangled particles break free.Brody explores such concepts as local realism, Bell's inequality, polarization, time dilation, and special relativity. He introduces readers to imaginary physicists Alice and Bob and their photon analyses; points out that it's easier to reject falsehood than establish the truth; and reports that some physicists explain entanglement by arguing that we live in a cross-section of a higher-dimensional reality. He examines a variety of viewpoints held by physicists, including quantum decoherence, Niels Bohr's Copenhagen interpretation, genuine fortuitousness, and QBism. This relatively recent interpretation, an abbreviation of “quantum Bayesianism,” holds that there's no such thing as an absolutely accurate, objective probability “out there,” that quantum mechanical probabilities are subjective judgments, and there's no “action at a distance,” spooky or otherwise.

An engaging and accessible presentation of the most famous algorithms and applications of quantum computingThe Joy of Quantum Computing introduces quantum computing succinctly, and with minimal mathematical formalism. Engagingly written—a feast for the reader’s inner nerd—it presents the most famous algorithms and applications of quantum computing and quantum information science, including the “killer apps,” Grover’s search algorithm, and Shor’s factoring algorithm. The only prerequisite is precalculus; readers need no knowledge of quantum physics. Matrices are relegated to the (completely optional) final two chapters. The book shows readers that quantum information science is about more than just high-speed calculations and data security. It is also about the fundamental meaning of quantum mechanics and the ultimate nature of reality.The Joy of Quantum Computing is suitable for classroom use or independent study by questing autodidacts.• Offers detailed explanations of quantum circuits, quantum algorithms, and quantum mysteries• Explains how to apply quantum information science to cryptography (and how Shor’s algorithm menaces classical cryptography)• Introduces the mystifying topics of quantum teleportation and the no-cloning theorem• Discusses Bell inequalities, which permit experimental tests of philosophical assumptions• Presents a simple model of quantum decoherence, shedding light on Schrödinger’s mysterious cat

An engaging and accessible presentation of the most famous algorithms and applications of quantum computingThe Joy of Quantum Computing introduces quantum computing succinctly, and with minimal mathematical formalism. Engagingly written—a feast for the reader’s inner nerd—it presents the most famous algorithms and applications of quantum computing and quantum information science, including the “killer apps,” Grover’s search algorithm, and Shor’s factoring algorithm. The only prerequisite is precalculus; readers need no knowledge of quantum physics. Matrices are relegated to the (completely optional) final two chapters. The book shows readers that quantum information science is about more than just high-speed calculations and data security. It is also about the fundamental meaning of quantum mechanics and the ultimate nature of reality.The Joy of Quantum Computing is suitable for classroom use or independent study by questing autodidacts.• Offers detailed explanations of quantum circuits, quantum algorithms, and quantum mysteries• Explains how to apply quantum information science to cryptography (and how Shor’s algorithm menaces classical cryptography)• Introduces the mystifying topics of quantum teleportation and the no-cloning theorem• Discusses Bell inequalities, which permit experimental tests of philosophical assumptions• Presents a simple model of quantum decoherence, shedding light on Schrödinger’s mysterious cat