Coherency and entanglement are the myths of quantum mechanics. Its important property, unrecognized until now, is inequality of forward and reversed processes. The existent experimental proofs and suggested experiments are discussed.
From its seemingly non-intuitive and puzzling nature, most evident in numerous EPR-like gedanken experiments to its almost ubiquitous presence in quantum technologies, entanglement is at the heart of modern quantum physics. First introduced by Erwin Schrödinger nearly a century ago, entanglement has remained one of the most fascinating ideas that came out of quantum mechanics. Here, we attempt to explain what makes entanglement fundamentally different from any classical phenomenon. To this end, we start with a historical overview of entanglement and discuss several hidden variables models that were conceived to provide a classical explanation and demystify quantum entanglement. We discuss some inequalities and bounds that are violated by quantum states thereby falsifying the existence of some of the classical hidden variables theories. We also discuss some exciting manifestations of entanglement, such as N00N states and the non-separable single particle states. We conclude by discussing some contemporary results regarding quantum correlations and present a future outlook for the research of quantum entanglement.
Quantum entanglement is a fundamental feature of quantum mechanics that refers to the correlation of properties of two or more quantum systems, even when they are separated by large distances. This phenomenon has been extensively studied and has led to a deeper understanding of quantum mechanics as well as potential applications in quantum computing and communication. This paper provides an analytical review of the current state of research on quantum entanglement. It covers the historical development of the concept, starting with the EPR paradox, the experimental tests of Bell's inequality, and the implications of quantum entanglement in quantum computing and communication. The paper also highlights the open questions and debates in the field of quantum entanglement. The paper concludes that while much research has been done on the topic, many questions remain unanswered and further research is needed to fully understand and harness the power of quantum entanglement.