Learn More
A quantum simulator is a well-controlled quantum system that can follow the evolution of a prescribed model whose behaviour may be difficult to determine. A good example is the simulation of a set of interacting spins, where phase transitions between various spin orders can underlie poorly understood concepts such as spin liquids. Here we simulate the(More)
Homeless youth are prone to HIV due to their engagement in high risk behavior. Many agencies conduct interventions to educate/train a select group of homeless youth about HIV prevention practices and rely on word-of-mouth spread of information through their social network. Previous work in strategic selection of intervention participants does not handle(More)
A study was made of complex usages of language in the spontaneous conversation of 30 4-year-old girls, their mothers and their teachers, at home and at school. There were significant social class differences in frequency, but almost all the usages appeared in the talk of almost all the mothers and children at least once. The working class girls' language(More)
Crystals of trapped atomic ions are among the most promising platforms for the quantum simulation of many-body quantum physics. Here, we describe recent developments in the simulation of quantum magnetic spin models with trapped 171 Yb + ions, and discuss the possibility of scaling the system to a level of complexity where classical computation becomes(More)
Radio-recordings were made of the conversation of 30 girls, aged just under four, at school with their teachers and at home with their mothers. Half the girls were middle class and half working class. The frequency and type of question asked by the children and the frequency and type of answer given by the adults were analysed. Particular attention was paid(More)
A study was made of the "cognitive demands" made of children during spontaneous conversations with their teachers at nursery school and their mothers at home. Social class differences were small compared with home/school differences. Teachers' talk contained a higher proportion of cognitive demands and "testing" demands than did mothers' talk; however, the(More)
Homeless youth are prone to Human Immunodeficiency Virus (HIV) due to their engagement in high risk behavior such as unprotected sex, sex under influence of drugs, etc. Many non-profit agencies conduct interventions to educate and train a select group of homeless youth about HIV prevention and treatment practices and rely on word-of-mouth spread of(More)