scholarly journals Quantifying Decoherence via Increases in Classicality

Entropy ◽  
2021 ◽  
Vol 23 (12) ◽  
pp. 1594
Author(s):  
Shuangshuang Fu ◽  
Shunlong Luo
Keyword(s):  
Information Acquisition ◽  
Open Systems ◽  
Superposition Principle ◽  
Information Leakage ◽  
Direct Consequence ◽  
Information Theoretic ◽  
Classical Transition ◽  
Quantum Mutual Information ◽  
System Information ◽  
Century Development

As a direct consequence of the interplay between the superposition principle of quantum mechanics and the dynamics of open systems, decoherence is a recurring theme in both foundational and experimental exploration of the quantum realm. Decoherence is intimately related to information leakage of open systems and is usually formulated in the setup of “system + environment” as information acquisition of the environment (observer) from the system. As such, it has been mainly characterized via correlations (e.g., quantum mutual information, discord, and entanglement). Decoherence combined with redundant proliferation of the system information to multiple fragments of environment yields the scenario of quantum Darwinism, which is now a widely recognized framework for addressing the quantum-to-classical transition: the emergence of the apparent classical reality from the enigmatic quantum substrate. Despite the half-century development of the notion of decoherence, there are still many aspects awaiting investigations. In this work, we introduce two quantifiers of classicality via the Jordan product and uncertainty, respectively, and then employ them to quantify decoherence from an information-theoretic perspective. As a comparison, we also study the influence of the system on the environment.

Robust variations of secret sharing through noisy quantum channel

2014 ◽  
Vol 14 (7&8) ◽  
pp. 589-607
Author(s):  
Xiu-Bo Chen ◽  
Gang Xu ◽  
Yuan Su ◽  
Yi-Xian Yang
Keyword(s):  
Secret Sharing ◽  
Quantum Channel ◽  
Security Analysis ◽  
Information Leakage ◽  
Quantum Secret Sharing ◽  
The Other ◽  
Information Theoretic ◽  
Information Theoretic Security ◽  
Fundamental Requirement ◽  
Noisy Quantum Channel

In this paper, the perfect secret sharing in quantum cryptography is investigated. On one hand, the security of a recent protocol [Adhikari et al. Quantum Inform. \& Comput. 12 (2012) 0253-0261] is re-examined. We find that it violates the requirement of information theoretic security in the secret sharing and suffers from the information leakage. The cryptanalysis including several specific attack strategies are given, which shows that a dishonest participant can steal half or all of the secrets without being detected. On the other hand, we design a new quantum secret sharing protocol. The security of protocol is rigorously proved. It meets the fundamental requirement of information theoretic security. Furthermore, the security analysis including both the outside attacks and participant attacks is given in details. It is shown that our proposed protocol can achieve perfect secret sharing.

scholarly journals CORRELATIONS IN QUANTUM PHYSICS

2012 ◽  
Vol 27 (01n03) ◽  
pp. 1345017 ◽  
Author(s):  
ROSS DORNER ◽  
VLATKO VEDRAL
Keyword(s):  
Quantum Physics ◽  
Quantum Measurements ◽  
Harmonic Oscillators ◽  
Theoretic Analysis ◽  
Information Theoretic ◽  
Coupled Harmonic Oscillators ◽  
Quantum Mutual Information ◽  
Classical Correlations ◽  
The Difference ◽  
Thermodynamic Transformations

We provide a historical perspective of how the notion of correlations has evolved within quantum physics. We begin by reviewing Shannon's information theory and its first application in quantum physics, due to Everett, in explaining the information conveyed during a quantum measurement. This naturally leads us to Lindblad's information theoretic analysis of quantum measurements and his emphasis of the difference between the classical and quantum mutual information. After briefly summarizing the quantification of entanglement using these ideas, we arrive at the concept of quantum discord, which naturally captures the boundary between entanglement and classical correlations. Finally we discuss possible links between discord, which the generation of correlations in thermodynamic transformations of coupled harmonic oscillators.

scholarly journals Signaling receptor localization maximizes cellular information acquisition in spatially-structured, natural environments

2021 ◽  
Author(s):  
Zitong Jerry Wang ◽  
Matt Thomson
Keyword(s):  
Information Acquisition ◽  
Spatial Organization ◽  
Natural Environments ◽  
Information Theoretic ◽  
Surface Receptors ◽  
Receptor Localization ◽  
Feedback Scheme ◽  
A Cell ◽  
Sense And Respond ◽  
Signaling Receptors

Cells in natural environments like tissue or soil sense and respond to extracellular ligands with intricately structured and non-monotonic spatial distributions that are sculpted by processes such as fluid flow and substrate adhesion. Nevertheless, traditional approaches to studying cell sensing assume signals are either uniform or monotonic, neglecting spatial structures of natural environments. In this work, we show that spatial sensing and navigation can be optimized by adapting the spatial organization of signaling pathways to the spatial structure of the environment. By viewing cell surface receptors as a sensor network, we develop an information theoretic framework for computing the optimal spatial organization of a sensing system for a given spatial signaling environment. Applying the framework to simulated environments, we find that spatial receptor localization maximizes information acquisition in many natural contexts, including tissue and soil. Receptor localization extends naturally to produce a dynamic protocol for redistributing signaling receptors during cell navigation and can be implemented in a cell using a feedback scheme. In a simulated tissue environment, dynamic receptor localization boosts navigation efficiency by 30-fold. Broadly, our framework readily adapts to studying how the spatial organization of signaling components other than receptors can be modulated to improve cellular information processing.

scholarly journals Information sharing and leakage in the two-echelon supply chain

2019 ◽  
Author(s):  
Jingru Wang ◽  
Zhiyuan Zhen ◽  
Qiang Yan
Keyword(s):  
Supply Chain ◽  
Information Sharing ◽  
Information Acquisition ◽  
Information Leakage ◽  
High Signal ◽  
Market Demand ◽  
Retail Competition ◽  
Ex Post ◽  
Private Signals ◽  
Demand Information

We consider ex post demand information sharing and leakage in a two-echelon supply chain consisting of one supplier and two retailers competing in quantities. The incumbent retailer has an advantage to acquire information about the market at a cost. If he invests in information acquisition, he privately acquires a signal about the market demand. We examine the incumbent’s incentive of information acquisition and sharing, and the upstream supplier’s information leakage strategy. We confirm that the incumbent’s information acquisition and sharing decisions depend on whether the information acquisition is observable. When it is observable, the incumbent fully shares his private signals even though the shared high signal may hurt him. However, when it is unobservable, the incumbent can share the favorable signal (low signal) and withhold the unfavorable signal (high signal). Moreover, we also find that the supplier will always leak the signal to the entrant no matter what signal she acquires. In addition, we demonstrate under the information sharing and leakage strategy, it may benefit the whole supply chain when the retail competition intensity is not very large.

The Implementation of Workshop Production Information Acquisition System Based on RFID and ZigBee

2014 ◽  
Vol 556-562 ◽  
pp. 6324-6327 ◽  
Author(s):  
Qing Hua Zhang ◽  
Jing Cheng ◽  
Guo Quan Cheng ◽  
Zhuan Wang ◽  
Da Zhang
Keyword(s):  
Real Time ◽  
Information Acquisition ◽  
Communication Protocol ◽  
Acquisition System ◽  
Server Side ◽  
Zigbee Technology ◽  
Information Demand ◽  
System Information

As requirements for the acquisition of workshop production information tends to be more instant and reliable, this paper proposed a workshop production information acquisition system based on RFID and ZigBee technology. After analyzing the system information demand, this paper designs the system physical structures, communication protocol, tag encoding and software hierarchy. Finally, designs and implements the server-side and terminal-side system which can make information acquisition more real-time and make the production more efficient.

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