In this paper, the author proposes a new world view in which microscopic particles exhibit quantum random selectivity and macroscopic objects exhibit classical states, and discusses how macroscopic objects behave classical states, in which quantum entanglement plays an important role. In order to better analyze the role of quantum entanglement in transmitting information, this paper shows the irreversible and chain-like transmission of quantum entanglement. In addition, whether quantum entanglement poses a threat to special relativity is discussed. As a supplement, the conjecture of inverse causality transmission and the Tumulka's theory are introduced. In the last part of this article, the misunderstanding of quantum entanglement is pointed out from the author's point of view. It is concluded that all particles in the world are connected, either through quantum entanglement, or through entanglement of particles in the form of entanglement chains.
In this paper, the author proposes a new world view in which microscopic particles exhibit quantum random selectivity and macroscopic objects exhibit classical states, and discusses how macroscopic objects behave classical states, in which quantum entanglement plays an important role. In order to better analyze the role of quantum entanglement in transmitting information, this paper shows the irreversible and chain-like transmission of quantum entanglement. In addition, whether quantum entanglement poses a threat to special relativity is discussed. As a supplement, the conjecture of inverse causality transmission and the Tumulka's theory are introduced. In the last part of this article, the misunderstanding of quantum entanglement is pointed out from the author's point of view. It is concluded that all particles in the world are connected, either through quantum entanglement, or through entanglement of particles in the form of entanglement chains.
An exponential rise in the demand of secured information processing requires an alternative approach from the conventional classical world, and the present scientific community believes that one of the most distinctive physical resources of the quantum world is quantum entanglement. It is a unique correlation between the components of quantum multipartite systems, which has never been observed in the classical macroscopic world. It is a tool that not only explains the effectiveness and fruitfulness of quantum information processing compared to its classical counterpart but also becomes significant from the security point of view when quantum communication is considered. The most trusted and investigated resource till date is quantum entanglement, for the purpose of secured data communication. Similar to energy, quantum entanglement is a physical resource connected to the odd nonclassical connections that can occur between distant quantum systems. Using a pair of entangled quantum systems, it is feasible to carry out computing operations that are impractical for conventional systems. Quantum information theory is a broad study of the information processing capabilities of quantum systems.
The surprising aspects of quantum information are due to two distinctly non-classical features of the quantum world: first, different quantum states need not be orthogonal and, second, quantum states may be entangled. Non-orthogonality leads to the blurring of classical distinctions. On the other hand, entanglement leads via non-locality to teleportation and other ``entanglement-assisted'' forms of communication that go beyond what is classically possible. In this article we attempt to understand these new possibilities via an analysis of the significance of entanglement for the basic physical concepts of a ``particle'' and a ``localized physical system''. Classical particles can be individuated on the basis of qualitative differences in their sets of properties. But in entangled states the ``particle labels'' of the quantum formalism usually do not pick out such sets of individuating particle properties. It is sometimes nevertheless possible to think in terms of individual particles, which may be localized; but we argue that in general the structure of quantum mechanics is at odds with such a particle interpretation. This finally leads us to the conclusion that quantum mechanics is best seen as not belonging to the category of space-time theories, in which physical quantities are functions on space-time points. The resulting picture of the quantum world is relevant for our understanding of the way in which quantum theory is non-local, and it sheds light on the novel aspects of quantum information.
The subject of quantum computing brings together ideas from classical information theory, computer science, and quantum physics.This review aims to summarize not just quantum computing, but the whole subject of quantum information theory.Information can be identified as the most general thing which must propagate from a cause to an effect.It therefore has a fundamentally important role in the science of physics.However, the mathematical treatment of information, especially information processing, is quite recent, dating from the mid-20th century.This has meant that the full significance of information as a basic concept in physics is only now being discovered.This is especially true in quantum mechanics.The theory of quantum information and computing puts this significance on a firm footing, and has led to some profound and exciting new insights into the natural world.Among these are the use of quantum states to permit the secure transmission of classical information (quantum cryptography), the use of quantum entanglement to permit reliable transmission of quantum states (teleportation), the possibility of preserving quantum coherence in the presence of irreversible noise processes (quantum error correction), and the use of controlled quantum evolution for efficient computation (quantum computation).The common theme of all these insights is the use of quantum entanglement as a computational resource.
New experiments are revealing the power of large-scale quantum devices .
Entanglement is the counterintuitive idea that particles can have an intrinsic connection—a connection that endures no matter the distance between them. The phenomenon remains one of the most bizarre and least understood consequences of quantum mechanics. Measure the quantum properties of one of a pair of entangled particles, and the other changes instantaneously.
Researchers have pioneered ways to demonstrate quantum entanglement in mechanical systems. This artist’s conception of one experiment depicts an interferometer’s light field, which “carries” the entangled state. Image credit: Kavli Institute of Nanoscience, Delft University of Technology/Moritz Forsch.
Such strange phenomena typically have been relegated to the subatomic. But recently, physicists have taken entanglement and other quantum effects to new extremes by observing them in large systems including clouds of atoms, quantum drums, wires, and etched silicon chips. Device by device, they are bringing the quantum world into new territory—the macroscopic world.
This work is driving new applications. Some experimental quantum computers use loops of superconducting wire as qubits, storing quantum information. Large quantum objects have already been used to help detect gravitational waves; they could appear in next-generation devices such as ultrasensitive sensors and encryption systems. These innovations, though, reach beyond cutting-edge tech. Building bigger and bigger quantum objects even raises the possibility of exploring some of the most pervasive unsolved mysteries at the intersection between quantum and classical worlds—and between quantum mechanics and gravity.
Ever since Austrian physicist Erwin Schrodinger first described wave–particle duality 90 years ago (1), physicists have been probing the boundary between the observable, predictable macroscopic world and the one where probabilistic quantum rules dominate. In the quantum world, a particle exists as a wave representing the probabilities of its location. Once measured, however, the particle is found at a point …
Information and computation theory have undergone a spurt of new growth, and a renewal of their historic connection to basic physics, as they have expanded to treat the intact transmission and processing of quantum states, and the interaction of such 'quantum information' with traditional forms of information. We may wonder why this did not happen earlier, as quantum principles have long been accepted as fundamental to all of physics. Perhaps the founders of information and computation theory, such as Shannon, Turing and von Neumann, were too accustomed to thinking of information processing in macroscopic terms, not yet having before them the powerful examples of the genetic code and ever-shrinking microelectronics. Be that as it may, information until recently has largely been thought of in classical terms, with quantum mechanics playing a supporting role in the design of the equipment to process it, and setting limits on the rate at which it could be sent through certain channels. Now we know that a fully quantum theory of information and information processing offers, among other benefits, a brand of cryptography whose security rests on fundamental physics, and a reasonable hope of constructing quan- tum computers that could dramatically speed up the solution of certain mathematical problems. These benefits depend on distinc- tively quantum properties such as uncertainty, interference and entanglement. At a more fundamental level, it has become clear that an information theory based on quantum principles extends and completes classical information theory, just as complex numbers extend and complete the reals. Besides quantum generalizations of classical notions such as sources, channels and codes, the new theory includes two complementary, quantifiable kinds of information— classical information and quantum entanglement. Classical infor- mation can be copied at will, but can only be transmitted forward in time, to a receiver in the sender's forward light cone. Entanglement in contrast, cannot be copied, but can connect any two points in space-time. Conventional data processing operations destroy entanglement, but quantum operations can create it and use it for various purposes, such as speeding up certain classical computa- tions and assisting in the transmission of classical information or intact quantum states. Part of the new quantum information theory is the qualitative and quantitative study of entanglement, and its interactions with classical information. Any means, such as an optical fibre, of delivering quantum systems more or less intact from one place to another, may be viewed as a quantum channel. Unlike classical channels, which are well characterized by a single capacity, quantum channels have several distinct capacities, depending on what one is trying to use them for, and what auxiliary resources are brought into play. New effects involving quantum information continue to be discovered, not only in the traditional areas of computation, channel capacity, and cryptography, but in areas such as commu- nication complexity and game theory.
Given review is denoted to an important problem, connected with physical processes in the intermediate zone between microand macrocosmic. It is kept a row of new and original results. First of all, we come from the new view to the whole complex problem in the intermediate zone. The classical quantum mechanics describes the processes in microcosmic only and even is not tortured to touch complex evolutionary phenomena's in the intermediate world. As an effect, playing in her a central role the principle of Born on a probably interpretation of wave functions at all is not motivated and is received as some postulate. We come from а view, that is necessary consider real physical processes on scattering of wave packages in scales of the intermediate zone. Such physical approach shows degree of approximation and insufficiency of the Born principle. We present the method of description of such evolution, based on the nonlinear differential equation. Some Markov chain characteristics are make more precised and is formulated important for the given problems a characteristic of monotonic behavior of probability. Using one fine inequality, we are studied an evolution of relative entropy in the classical theory. Then we study the phenomena of irreversibility in quantum problems. Original derivation of the Lindblad equation for a wave density function is presented and, moreover, for the first time this equation is given physical motivation. We developed a deep analogy between classical Markov processes and process to evolutions, described by the Lindblad equation. Differential equation system, more general, than the known equation of evolution of Leggett and Caldeira, is derived. Quantum systems without inverse their in.uences upon surrounding background (that really for high temperatures) are considered. Quantum di.usion of single particles is studied also in detail. The famous paradox of Shredinger cat is discussed. A special role of the external world for phenomena with the quantum irreversibility is underlined. Against the opinion of Kadomtsev and Menskii, in equilibrium medium no need to postulate and consider processes with collapse of the wave functions. Is it pointed out, that the Heisenberg uncertainty relation not always gives usually understood restriction on making of an average of commuting values. Some prospects in the problem quantum irreversibility are planed.