Iterative procedure for computing accessible information in quantum communication

Quantum communication leads to strong correlations, that can outperform classical ones. Complementary to previous works in this area, we investigate correlations in prepare-and-measure scenarios assuming a bound on the information content of the quantum communication, rather than on its Hilbert-space dimension. Specifically, we explore the extent of classical and quantum correlations given an upper bound on the one-shot accessible information. We provide a characterisation of the set of classical correlations and show that quantum correlations are stronger than classical ones. We also show that limiting information rather than dimension leads to stronger quantum correlations. Moreover, we present device-independent tests for placing lower bounds on the information given observed correlations. Finally, we show that quantum communication carrying log⁡d bits of information is at least as strong a resource as d-dimensional classical communication assisted by pre-shared entanglement.

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Separable states can be used to realize the fair quantum communication

International Journal of Quantum Information ◽

10.1142/s0219749919500047 ◽

2019 ◽

Vol 17 (01) ◽

pp. 1950004

Author(s):

Dong-Mei Gao ◽

Ying Xin ◽

Zai-Liang Ye ◽

Xiao-Yan Qiao

Keyword(s):

Channel Coding ◽

Quantum Communication ◽

Sufficient Conditions ◽

Basic Question ◽

Classical Correlation ◽

Quantum Communications ◽

Nonclassical State ◽

Accessible Information ◽

Essential Resource ◽

Classical Means

When Alice and Bob are never entangled with each other, can they share equal amount of information via noiseless channels? When the transfered subsystem B is classical, this basic question concerning communication capacity has a very satisfying answer: the amount of accessible information, as quantified by the classical correlation on B, is always equal. If the subsystem B is in a nonclassical state, the amount of accessible information, like their classical counterparts, is also well quantified by classical correlation, but the similarity ends here: the amount of accessible information from shared states may not be equal, because the subsystem B cannot be accessed perfectly by classical means. In this work, we show how to establish fair quantum communications. Our results give sufficient conditions for fair quantum communications and show that symmetric discord is the essential resource for this task. We further demonstrate that the fair quantum communication is fundamentally the same as the Shannon noisy channel coding theorem.

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Assessing impact of the provision of accessible information to families with Congenital Hyperinsulinism (CHI)

Endocrine Abstracts ◽

10.1530/endoabs.45.p58 ◽

2016 ◽

Author(s):

Lauren Trimarco ◽

Indi Banerjee ◽

Lindsey Rigby ◽

Louise Bowden ◽

Maria Salomon Estebanez ◽

...

Keyword(s):

Congenital Hyperinsulinism ◽

Accessible Information

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On the construction of orthogonal curvilinear grids for regional oceanic modeling: algorithm and user guide

Journal of Oceanological Research ◽

10.29006/1564-2291.jor-2020.48(4).3 ◽

2020 ◽

Vol 48 (4) ◽

pp. 45-111

Author(s):

A. F. Shepetkin

Keyword(s):

Inverse Problem ◽

Numerical Solution ◽

Elliptic Problem ◽

Software Package ◽

Conformal Transformation ◽

Iterative Procedure ◽

Geometric Shape ◽

Curvilinear Grids ◽

Grid Points ◽

Grid Nodes

A new algorithm for constructing orthogonal curvilinear grids on a sphere for a fairly general geometric shape of the modeling region is implemented as a “compile-once - use forever” software package. It is based on the numerical solution of the inverse problem by an iterative procedure -- finding such distribution of grid points along its perimeter, so that the conformal transformation of the perimeter into a rectangle turns this distribution into uniform one. The iterative procedure itself turns out to be multilevel - i.e. an iterative loop built around another, internal iterative procedure. Thereafter, knowing this distribution, the grid nodes inside the region are obtained solving an elliptic problem. It is shown that it was possible to obtain the exact orthogonality of the perimeter at the corners of the grid, to achieve very small, previously unattainable level of orthogonality errors, as well as make it isotropic -- local distances between grid nodes about both directions are equal to each other.

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Comparison of Time spent between an electronic and a paper-based laboratory information system by laboratorians at a polyclinic in Greater Accra, Ghana: A time-motion study

10.31124/advance.12917756.v1 ◽

2020 ◽

Author(s):

Philip Boakye

Keyword(s):

Information System ◽

Negative Impact ◽

Laboratory Information System ◽

Time Motion ◽

Accessible Information ◽

Motion Study ◽

Significant Difference ◽

Significant Negative Impact ◽

Key Issues ◽

Motion Studies

The acceptance of electronic laboratory information system (LIS) is gradually increasing in developing countries. However, the issue of time effectiveness due to computerization is less clear as there is fewer accessible information. One of the key issues for laboratorians is their indecision with LISs’ would-be effect of time on their work. A polyclinic in Ghana was in the process of implementing electronic LIS. Several of the laboratorians did not have knowledge and skill in computing and there were disagreeing views on the time effectiveness of the LIS after implementation. The management of the polyclinic laboratory was concerned to assess time advantageousness of recording data when using the electronic LIS compared with paper-based LIS. <div><br></div><div>Five randomly selected laboratorians were provided two sheets of paper with tables to document the time they spent for both paper-based and electronic LIS. Data were collected for a total of 230 records,115 electronic LIS and 115 paper-based LIS. The t-test (mean-comparison test) was computed to compare the means of both electronic and paperbased LIS times. </div><div><br></div><div>There was a statistical significant difference in the time spent between electronic and paper-based LIS. The time spent between paper-based and electronic LIS was 0.41 minutes (95% CI 0.15 to 0.66) longer than in electronic LIS. </div><div><br></div><div>LIS can be adopted in polyclinics without having significant negative impact on time spent between electronic and paper-based LIS. More time–motion studies that include laboratorians are however necessary in order to get a more complete picture of time spent between electronic and paper-based LIS. </div>

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Transportation Economic and Land Use System

Transportation Research Record Journal of the Transportation Research Board ◽

10.3141/1617-12 ◽

1998 ◽

Vol 1617 (1) ◽

pp. 84-89 ◽

Cited By ~ 1

Author(s):

Louis J. Pignataro ◽

Joseph Wen ◽

Robert Burchell ◽

Michael L. Lahr ◽

Ann Strauss-Wieder

Keyword(s):

Land Use ◽

Information System ◽

Management Tool ◽

Improvement Program ◽

Transportation Projects ◽

Accessible Information ◽

Surface Transportation ◽

Land Use System ◽

Land Use Effects ◽

Computer Based

The purpose of the Transportation Economic and Land Use System (TELUS) is to convert the transportation improvement program (TIP) into a management tool. Accordingly, the system provides detailed and easily accessible information on transportation projects in the region, as well as their interrelationships and impacts. By doing so, TELUS enables public-sector agencies to meet organizational, Intermodal Surface Transportation Efficiency Act, state, and other mandates more effectively. The objectives are accomplished by providing the computer-based capability to analyze, sort, combine, and track transportation projects in or under consideration for a TIP; assessing the interrelationships among significant transportation projects; estimating the regional economic and land use effects of transportation projects; and presenting project information in an easily understood format, including geographic information system formats.

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The invisible hole of information on SMB's cybersecurity

Online Journal of Applied Knowledge Management ◽

10.36965/ojakm.2019.7(1)14-26 ◽

2019 ◽

Vol 7 (1) ◽

pp. 14-26

Author(s):

Ruti Gafni ◽

Tal Pavel

Keyword(s):

Mass Communication ◽

Cyber Attacks ◽

Communication Media ◽

Specific Information ◽

Exploratory Research ◽

Cyber Attack ◽

Public Attention ◽

Cyber Threats ◽

Accessible Information ◽

Types Of Information

Small and Medium Businesses (SMB) use Internet and computer-based tools in their daily processes, sometimes without being aware to the cyber threats, or without knowing how to be prepared in case of a cyber-attack, although they are a major target for cyber-attacks. Specific information about cybersecurity needed by SMBs, in order to cope with cyber threats, is not always available or easily accessible. In this study, a vast search of different types of information about SMBs’ cybersecurity was performed, in order to find whether a hole of accessible information exists in this area. This exploratory research covered general mass communication media channels, technological and professional cybersecurity websites, and academic journals, and found that indeed very few studies, articles and news items were published in this matter. Leveraging knowledge and awareness, diminishing the shame for reporting cyber-attacks, and increasing mass communication media interest and public attention, may be activities to cover this “invisible hole”.

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