A concise, non-technical exploration of quantum entanglement—the enigma Albert Einstein called ‘spooky action at a distance’—and how it contradicts our 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.

From 2004 to 2006 the Osage Nation conducted a contentious governmental reform process in which sharply differing visions arose over the new government's goals, the Nation's own history, and what it means to be Osage. The primary debates were focused on biology, culture, natural resources, and sovereignty. Osage anthropologist Jean Dennison documents the reform process in order to reveal the lasting effects of colonialism and to illuminate the possibilities for indigenous sovereignty. In doing so, she brings to light the many complexities of defining indigenous citizenship and governance in the twenty-first century. By situating the 2004-6 Osage Nation reform process within its historical and current contexts, Dennison illustrates how the Osage have creatively responded to continuing assaults on their nationhood. A fascinating account of a nation in the midst of its own remaking, Colonial Entanglement presents a sharp analysis of how legacies of European invasion and settlement in North America continue to affect indigenous people's views of selfhood and nationhood.

Investigates how data production and consumption territorialize the physical landscape filtered through Ireland’s role in global communications and, as told by the Irish Pavilion at the 2021 Venice Architecture Biennale, features an installation that focuses on the materiality of data infrastructure in space. As our everyday lives become increasingly entangled with data technologies, the book addresses the utopian fantasy that surrounds the Cloud, as transcending physical presence or resourcing. By bringing the physical infrastructure around data, and its impact on the environment under the spotlight, it hopes to reframe how we understand data production and highlight the myth that information technologies are hidden and without major material manifestations on the landscape. The context for the book is Ireland which has a significant historical role in the evolution of global communications and data infrastructure. In 1866, the world’s first transatlantic telegraph cable landed on the West coast of Ireland. In 1901, the inventor of the radio Guglielmo Marconi transmitted some of the world’s first wireless radio messages from Ireland across the Atlantic Ocean to Newfoundland. Today, Dublin has overtaken London as the data centre hub of Europe, hosting 25% of all available European server space. And by the year 2027, data centres are forecast to consume a third of Ireland’s total electricity demand. The book aims to raise awareness around the hardware of the global internet and Cloud services, which is interwoven with the Irish landscape—made manifest through the vast constellation of data centres, fibre optic cable networks, and energy grids that have come to populate its cities and suburbs over recent decades. The publication accompanies and supports Entanglement, the Irish Pavilion at the 17th Venice Architecture Biennale by archiving the production of the pavilion filtered through a series of poetic excerpts that describe the form, components, content and furniture that make up the installation. At the same time the book is conceived as more than just a catalog by positioning some of the cultural and spatial implications of data technologies in Ireland within a more universal context through contributions by ANNEX, the team selected to produce the pavilion, as well as invited contributors from the disciplines of Media Theory; Journalism; Computer Science, Geography; History and Architecture.

A memory-impaired time traveller attempts to correct a tragic mistake he made in 1977 when, panicked, he abandoned his brother on a frozen lake in Baltimore. Decades later, in 2011, a novelist researching at the Centre for Time in Sydney becomes romantically involved with a philosopher from New Zealand. Another eight years on, and a writer at a lake retreat in New Zealand in 2019 obsesses over the disintegration of his marriage following another tragedy. Are these separate stories, or are they one? Is the time traveller actually travelling? Can the past be changed? As the answers to these questions slowly emerge, the three tales become entangled, along with the usual abstractions: love, desperation and physics.

Entanglement was initially thought by some to be an oddity restricted to the realm of thought experiments. However, Bell’s inequality delimiting local - havior and the experimental demonstration of its violation more than 25 years ago made it entirely clear that non-local properties of pure quantum states are more than an intellectual curiosity. Entanglement and non-locality are now understood to ?gure prominently in the microphysical world, a realm into which technology is rapidly hurtling. Information theory is also increasingly recognized by physicists and philosophers as intimately related to the foun- tions of mechanics. The clearest indicator of this relationship is that between quantum information and entanglement. To some degree, a deep relationship between information and mechanics in the quantum context was already there to be seen upon the introduction by Max Born and Wolfgang Pauli of the idea that the essence of pure quantum states lies in their provision of probabilities regarding the behavior of quantum systems, via what has come to be known as the Born rule. The signi?cance of the relationship between mechanics and information became even clearer with Leo Szilard’s analysis of James Clerk Maxwell’s infamous demon thought experiment. Here, in addition to examining both entanglement and quantum infor- tion and their relationship, I endeavor to critically assess the in?uence of the study of these subjects on the interpretation of quantum theory.

In The Age of Entanglement, Louisa Gilder brings to life one of the pivotal debates in twentieth century physics. In 1935, Albert Einstein famously showed that, according to the quantum theory, separated particles could act as if intimately connected–a phenomenon which he derisively described as “spooky action at a distance.” In that same year, Erwin Schrödinger christened this correlation “entanglement.” Yet its existence was mostly ignored until 1964, when the Irish physicist John Bell demonstrated just how strange this entanglement really was. Drawing on the papers, letters, and memoirs of the twentieth century’s greatest physicists, Gilder both humanizes and dramatizes the story by employing the scientists’ own words in imagined face-to-face dialogues. The result is a richly illuminating exploration of one of the most exciting concepts of quantum physics.

Entanglement and (de-)coherence arguably define the central issues of concern in present day quantum information theory. Entanglement being a consequence of the quantum mechanical superposition principle for composite systems, a better understanding of the environment-induced destruction of coherent superposition states is required to devise novel strategies for harvesting quantum interference phenomena. The present book collects a series of advanced lectures on the theoretical foundations of this active research field, from mathematical aspects underlying quantum topology to mesoscopic transport theory. All lectures start out from an elementary level and proceed along a steep learning curve. This makes the material particularly suitable for student seminars on the more fundamental theoretical aspects of quantum information, and equally useful as supplementary reading for advanced lectures on this topic.