Noise in One-Dimensional Measurement-Based Quantum Computing

Measurement-Based Quantum Computing (MBQC) is an alternative to the quantum circuit model, whereby the computation proceeds via measurements on an entangled resource state. Noise processes are a major experimental challenge to the construction of a quantum computer. Here, we investigate how noise processes affecting physical states affect the performed computation by considering MBQC on a one-dimensional cluster state. This allows us to break down the computation in a sequence of building blocks and map physical errors to logical errors. Next, we extend the Matrix Product State construction to mixed states (which is known as Matrix Product Operators) and once again map the effect of physical noise to logical noise acting within the correlation space. This approach allows us to consider more general errors than the conventional Pauli errors, and could be used in order to simulate noisy quantum computation.Comment: 16 page

Neural network modeling of memory deterioration in Alzheimer's disease

The clinical course of Alzheimer's disease (AD) is generally characterized by progressive gradual deterioration, although large clinical variability exists. Motivated by the recent quantitative reports of synaptic changes in AD, we use a neural network model to investigate how the interplay between synaptic deletion and compensation determines the pattern of memory deterioration, a clinical hallmark of AD. Within the model we show that the deterioration of memory retrieval due to synaptic deletion can be much delayed by multiplying all the remaining synaptic weights by a common factor, which keeps the average input to each neuron at the same level. This parallels the experimental observation that the total synaptic area per unit volume (TSA) is initially preserved when synaptic deletion occurs. By using different dependencies of the compensatory factor on the amount of synaptic deletion one can define various compensation strategies, which can account for the observed variation in the severity and progression rate of AD

Hosts and Guests: Surfers\u27 Experiences of Travel and Tourism in the First Wave of the Covid-19 Pandemic

In the first year of the COVID-19 pandemic, millions of people experienced travel disruptions and tourism destinations felt the economic sting of low visitor numbers. Using online interviews, this study followed 29 surfers over the course of 6 months to explore their experiences of the pandemic as travelers and hosts within tourism destinations in the US, Europe, Africa, the Middle East, Australia, the Caribbean, and Latin America. It examines the effect of the pandemic on their travel plans, travel experiences, and tourism destinations where they lived. Many participants experienced travel disruptions and had to go through different decision-making and behavioral processes when they did travel. They also had conflicting feelings about decreased numbers of tourists at the beginning of the pandemic and when tourists began to return. The results have implications for travel companies to maintain flexible policies and the need to diversify coastal economies and possibly implement more separation between tourists and residents

Susie on a Sunday

L.E. Usher is an Australian novelist whose books include Miss (1999), and The Sudden Spoon (2001). Her most recent novel Then Came October (based on the life of a Victorian murderess) will be published by Harbour Books, UK, in September 2008

Atmospheric cloud physics laboratory project study

Engineering studies were performed for the Zero-G Cloud Physics Experiment liquid cooling and air pressure control systems. A total of four concepts for the liquid cooling system was evaluated, two of which were found to closely approach the systems requirements. Thermal insulation requirements, system hardware, and control sensor locations were established. The reservoir sizes and initial temperatures were defined as well as system power requirements. In the study of the pressure control system, fluid analyses by the Atmospheric Cloud Physics Laboratory were performed to determine flow characteristics of various orifice sizes, vacuum pump adequacy, and control systems performance. System parameters predicted in these analyses as a function of time include the following for various orifice sizes: (1) chamber and vacuum pump mass flow rates, (2) the number of valve openings or closures, (3) the maximum cloud chamber pressure deviation from the allowable, and (4) cloud chamber and accumulator pressure

Risk Communication in the Tourism Industry

This chapter focuses on risk communication in the tourism sector. Tourism organizations must communicate with a variety of stakeholders when conveying messages about impending severe weather or disasters, which are increasing due climate change and sea level rise. There is also an increased need to distribute information to tourism stakeholders about preparing for, continuing service during, and recovering from, disasters. Stakeholders involved with the tourism industry include business owners, government officials and tourists, all of whom have differing degrees of vulnerability in a destination when a threat occurs. Different messages regarding disaster preparation and recovery must be communicated to the different stakeholders, and often industry associations or convention and visitors’ bureaus are responsible for relaying these messages. The chapter provides an overview of previous research on risk communication. The authors then detail a case study about improving risk communication and information among tourism stakeholders in coastal Virginia. The chapter concludes with lessons for public officials, destination management organizations, and tourism business owners to improve their risk communication

Exploring Event Satisfaction, Surfing Experiences and Destination Image at the World Championships of Surf Kayaking in Peru

Sporting events can be a way to bring economic income, increased visitation and greater visibility to a destination. Despite the increase in surf tourism research over the past two decades, few studies have explored competitive surfing events. The purpose of this study is to explore event satisfaction, surfing experiences, destination image and future behavioral intentions of competitors in the World Championships of Surf Kayaking. Researchers used an online survey to evaluate 41 competitors’ satisfaction with the event, experience in the destination and future behavioral intentions. With some exceptions, respondents were highly satisfied with the event, felt welcome in the surf, and had a positive image of Peru. Many of these factors were positively related to a high overall visit satisfaction and willingness to recommend the destination. The results have implications about competitor well-being for sporting event organizers and provide insights for surf destination marketers

Correspondence from E.B. Lovejoy, August 13, 1862

Correspondence from E.B. Lovejoy regarding absent soldiers from Androscoggin Countyhttps://digitalmaine.com/absent_soldiers/1005/thumbnail.jp