scholarly journals Quantum Darwinism, Decoherence, and the Randomness of Quantum Jumps

2014 ◽  
Author(s):  
Wojciech H. Zurek
Keyword(s):  
Quantum Jumps ◽  
Quantum Darwinism

Quantum jumps, Born’s rule, and objective classical reality via quantum Darwinism

2019 ◽  
pp. 292-325
Author(s):  
Wojciech Hubert Zurek
Keyword(s):  
Quantum Dynamics ◽  
Quantum States ◽  
Information Flows ◽  
Quantum Jumps ◽  
Born’S Rule ◽  
Quantum Universe ◽  
Quantum Darwinism ◽  
Pointer States ◽  
Entangled Quantum States

Emergence of the classical from the quantum substrate is a long-standing conundrum. The chapter describes its resolution based on three insights that stem from the recognition of the role of the environment. The chapter begins with the derivation of preferred states that define “events”, the essence of everyday classical reality. They arise from the tension between the unitary quantum dynamics and the nonlinear amplification inherent in replicating information. The resulting pointer states are consistent with these obtained via environment-induced superselection (einselection). They determine what can happen by defining events such as quantum jumps without appealing to Born’s rule for probabilities. Probabilities can be now deduced from envariance (a symmetry of entangled quantum states). With probabilities at hand one can quantify information flows accompanying decoherence. Effective amplification they represent explains perception of objective classical reality arising from within the quantum universe through redundancy of the pointer state records in their environment—through quantum Darwinism.

scholarly journals Quantum theory of the classical: quantum jumps, Born’s Rule and objective classical reality via quantum Darwinism

2018 ◽  
Vol 376 (2123) ◽  
pp. 20180107 ◽  
Author(s):  
Wojciech Hubert Zurek
Keyword(s):  
Statistical Physics ◽  
Foundations Of Quantum Mechanics ◽  
Information Flows ◽  
Quantum Jumps ◽  
Born’S Rule ◽  
Quantum Darwinism ◽  
Pointer States ◽  
Classical Quantum ◽  
Entangled Quantum States ◽  
Macroscopic Quantum Systems

The emergence of the classical world from the quantum substrate of our Universe is a long-standing conundrum. In this paper, I describe three insights into the transition from quantum to classical that are based on the recognition of the role of the environment. I begin with the derivation of preferred sets of states that help to define what exists—our everyday classical reality. They emerge as a result of the breaking of the unitary symmetry of the Hilbert space which happens when the unitarity of quantum evolutions encounters nonlinearities inherent in the process of amplification—of replicating information. This derivation is accomplished without the usual tools of decoherence, and accounts for the appearance of quantum jumps and the emergence of preferredpointer statesconsistent with those obtained via environment-induced superselection, oreinselection. The pointer states obtained in this way determine what can happen—define events—without appealing to Born’s Rule for probabilities. Therefore,pk=|ψk|2can now be deduced from the entanglement-assisted invariance, orenvariance—a symmetry of entangled quantum states. With probabilities at hand, one also gains new insights into the foundations of quantum statistical physics. Moreover, one can now analyse the information flows responsible for decoherence. These information flows explain how the perception of objective classical reality arises from the quantum substrate: the effective amplification that they represent accounts for the objective existence of the einselected states of macroscopic quantum systems through the redundancy of pointer state records in their environment—throughquantum Darwinism.This article is part of a discussion meeting issue ‘Foundations of quantum mechanics and their impact on contemporary society’.

scholarly journals Application of quantum Darwinism to a structured environment

2017 ◽  
Vol 96 (6) ◽  
Author(s):  
Graeme Pleasance ◽  
Barry M. Garraway
Keyword(s):  
Quantum Darwinism

“QUANTUM JUMPS” AND INDISTINGUISHABILITY

1989 ◽  
Vol 04 (19) ◽  
pp. 1839-1845 ◽  
Author(s):  
ADRIAN KENT
Keyword(s):  
Quantum Mechanics ◽  
Relativistic Quantum ◽  
Relativistic Quantum Mechanics ◽  
Model Parameters ◽  
Quantum Jumps ◽  
Cover Systems

Ghirardi, Rimini and Weber have presented a statistical modification of non-relativistic quantum mechanics which unifies the description of microscopic and macroscopic systems of distinct particles. We revise their proposal to cover systems of indistinguishable particles. Testable, mathematically precise, realist models of non-relativistic physics result. We give empirically derived bounds on the model parameters.

scholarly journals Reading a Qubit Quantum State with a Quantum Meter: Time Unfolding of Quantum Darwinism and Quantum Information Flux

2019 ◽  
Vol 26 (04) ◽  
pp. 1950023
Author(s):  
Salvatore Lorenzo ◽  
Mauro Paternostro ◽  
G. Massimo Palma
Keyword(s):  
Quantum Information ◽  
Harmonic Oscillator ◽  
Quantum System ◽  
Quantum State ◽  
Common Theme ◽  
Quantum Harmonic Oscillator ◽  
Collision Model ◽  
Single Qubit ◽  
Quantum Darwinism

Quantum non-Markovianity and quantum Darwinism are two phenomena linked by a common theme: the flux of quantum information between a quantum system and the quantum environment it interacts with. In this work, making use of a quantum collision model, a formalism initiated by Sudarshan and his school, we will analyse the efficiency with which the information about a single qubit gained by a quantum harmonic oscillator, acting as a meter, is transferred to a bosonic environment. We will show how, in some regimes, such quantum information flux is inefficient, leading to the simultaneous emergence of non-Markovian and non-darwinistic behaviours.

scholarly journals Quantum Darwinism in a structured spin environment

2021 ◽  
Vol 416 ◽  
pp. 127675
Author(s):  
Eoghan Ryan ◽  
Mauro Paternostro ◽  
Steve Campbell
Keyword(s):  
Quantum Darwinism
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