Jennings, D orcid.org/0000-0003-1201-3725 and Leifer, M (2016) No return to classical reality. Contemporary Physics, 57 (1). pp. 60-82. ISSN 0010-7514
Abstract
At a fundamental level, the classical picture of the world is dead, and has been dead now for almost a century. Pinning down exactly which quantum phenomena are responsible for this has proved to be a tricky and controversial question, but a lot of progress has been made in the past few decades. We now have a range of precise statements showing that whatever the ultimate laws of nature are, they cannot be classical. In this article, we review results on the fundamental phenomena of quantum theory that cannot be understood in classical terms. We proceed by first granting quite a broad notion of classicality, describe a range of quantum phenomena (such as randomness, discreteness, the indistinguishability of states, measurement-uncertainty, measurement-disturbance, complementarity, non-commutativity, interference, the no-cloning theorem and the collapse of the wave-packet) that do fall under its liberal scope, and then finally describe some aspects of quantum physics that can never admit a classical understanding – the intrinsically quantum mechanical aspects of nature. The most famous of these is Bell’s theorem, but we also review two more recent results in this area. Firstly, Hardy’s theorem shows that even a finite-dimensional quantum system must contain an infinite amount of information, and secondly, the Pusey–Barrett–Rudolph theorem shows that the wave function must be an objective property of an individual quantum system. Besides being of foundational interest, results of this sort now find surprising practical applications in areas such as quantum information science and the simulation of quantum systems.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | quantum foundations; nonclassicality; statistical theories; wavefunction; quantum state |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Theoretical Physics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 12 Dec 2018 11:30 |
Last Modified: | 12 Dec 2018 11:30 |
Status: | Published |
Publisher: | Taylor & Francis |
Identification Number: | 10.1080/00107514.2015.1063233 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:139393 |