1,336 research outputs found
The Growth of Oligarchy in a Yard-Sale Model of Asset Exchange: A Logistic Equation for Wealth Condensation
The addition of wealth-attained advantage (WAA) to the Yard-Sale Model (YSM)
of asset exchange has been demonstrated to induce wealth condensation. In a
model of WAA for which the bias is a continuous function of the wealth
difference of the transacting agents, the condensation was shown to arise from
a second-order phase transition to a coexistence regime. In this paper, we
present the first analytic time-dependent results for this model, by showing
that the condensed wealth obeys a logistic equation in time.Comment: 15 pages, 2 figure
Theories of Reference: What Was the Question?
The new theory of reference has won popularity. However, a number of noted philosophers have also attempted to reply to the critical arguments of Kripke and others, and aimed to vindicate the description theory of reference. Such responses are often based on ingenious novel kinds of descriptions, such as rigidified descriptions, causal descriptions, and metalinguistic descriptions. This prolonged debate raises the doubt whether different parties really have any shared understanding of what the central question of the philosophical theory of reference is: what is the main question to which descriptivism and the causal-historical theory have presented competing answers. One aim of the paper is to clarify this issue. The most influential objections to the new theory of reference are critically reviewed. Special attention is also paid to certain important later advances in the new theory of reference, due to Devitt and others
Cross-level Validation of Topological Quantum Circuits
Quantum computing promises a new approach to solving difficult computational
problems, and the quest of building a quantum computer has started. While the
first attempts on construction were succesful, scalability has never been
achieved, due to the inherent fragile nature of the quantum bits (qubits). From
the multitude of approaches to achieve scalability topological quantum
computing (TQC) is the most promising one, by being based on an flexible
approach to error-correction and making use of the straightforward
measurement-based computing technique. TQC circuits are defined within a large,
uniform, 3-dimensional lattice of physical qubits produced by the hardware and
the physical volume of this lattice directly relates to the resources required
for computation. Circuit optimization may result in non-intuitive mismatches
between circuit specification and implementation. In this paper we introduce
the first method for cross-level validation of TQC circuits. The specification
of the circuit is expressed based on the stabilizer formalism, and the
stabilizer table is checked by mapping the topology on the physical qubit
level, followed by quantum circuit simulation. Simulation results show that
cross-level validation of error-corrected circuits is feasible.Comment: 12 Pages, 5 Figures. Comments Welcome. RC2014, Springer Lecture Notes
on Computer Science (LNCS) 8507, pp. 189-200. Springer International
Publishing, Switzerland (2014), Y. Shigeru and M.Shin-ichi (Eds.
Baron Guillaume Dupuytren: when brilliance combats professionalism.
Baron Guilluame Dupuytren was a French anatomist and surgeon who practiced during the 1800s and is considered by some to be the most brilliant and gifted surgeons of his time. His contributions to the field of surgery are quite extensive, yet his eccentric personality and attitude toward his colleagues, students, and patients raises a very interesting question: could Dr. Dupuytren (Fig. 1) and his many contributions to the field of surgery have thrived in today’s era of professionalism? The concept of professionalism is emphasized to medical students starting from day one of their medical training. How would Dr. Dupuytren, an esteemed anatomist, react to the idea that students are introduced to the idea of professionalism before entering the cadaver laboratory
Characteristics of Mesospheric Temperature and Gravity Waves over Chile in 2020-2021
Gravity waves (GWs) are often confused with gravitational waves in the fabric of space time. However, there is a clear distinction between them. Gravity wave is a term used by the atmospheric research field to describe perturbations in the atmosphere. Gravity pulls the perturbations down and causes oscillations, these present in the form of waves. The best visualization is to think of ripples on a pond, as the ripple reaches its peak gravity pulls the ripple down and creates an oscillating effect
Quantum information transport to multiple receivers
The importance of transporting quantum information and entanglement with high
fidelity cannot be overemphasized. We present a scheme based on adiabatic
passage that allows for transportation of a qubit, operator measurements and
entanglement, using a 1-D array of quantum sites with a single sender (Alice)
and multiple receivers (Bobs). Alice need not know which Bob is the receiver,
and if several Bobs try to receive the signal, they obtain a superposition
state which can be used to realize two-qubit operator measurements for the
generation of maximally entangled states.Comment: Modified in view of referee's comments, new author added, natural
scheme for operator measurements identified, hence W state preparation
replaced with GHZ state preparation via operator measurements. 4 pages, 3
figure
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