16,788 research outputs found
Quantum Dynamics Simulation with Classical Oscillators
In a previous paper [J.S.Briggs and A.Eisfeld, Phys.Rev.A 85, 052111] we
showed that the time-development of the complex amplitudes of N coupled quantum
states can be mapped by the time development of positions and velocities of N
coupled classical oscillators. Here we examine to what extent this mapping can
be realised to simulate the "quantum" properties of entanglement and qubit
manipulation. By working through specific examples, e.g. of quantum gate
operation, we seek to illuminate quantum/classical differences which hitherto
have been treated more mathematically. In addition we show that important
quantum coupled phenomena, such as the Landau-Zener transition and the
occurrence of Fano resonances can be simulated by classical oscillators
Theoretical Determination of the Boundary of the Geomagnetic Field in a Steady Solar Wind
Theoretical determination of the boundary of the geomagnetic field in a steady solar win
Able and gifted: judging by appearances?
In this article I reflect upon an aspect of my research involving Year 6 pupils identified by their teachers as ‘able’ or ‘gifted’ in mathematics, using ‘able’ to refer to high achievers and ‘gifted’ to exceptionally high achievers. I discuss the differences I observed between the able and gifted when solving mathematical tasks, and consider what these differences may mean for professionals involved in identifying gifted pupils. I speculate that teachers’ judgements are highly influenced by those aspects of achievement that are readily visible, such as answering questions quickly, and discuss the potential problems associated with judging by appearances
Doing gender and development: understanding empowerment and local gender relations
A major dilemma in Gender and Development (GAD) work is why it is that sometimes women may feel better off colluding with gendered structures that ensure their continued subordination rather than seeking approaches that will allow them to break free of this. Kandiyoti (1988 Gender and Society 2 274-90) has identified this apparent collusion as 'patriarchal bargains', which offer women greater advantages than they perceive can be achieved by challenging the prevailing order. Such women are therefore reluctant to engage in empowering activities that may challenge their gendered bargain. This paper explains this dilemma in the context of GAD work undertaken with Bedouin women in Southern Egypt
The nodal structure of doubly-excited resonant states of helium
The authors examine the nodal structure of accurate helium wavefunctions calculated by direct diagonalization of the full six-dimensional problem. It is shown that for fixed interelectronic distance R (or hyperspherical radius R) the symmetric doubly-excited resonant states have well defined lambda , mu nodal structure indicating a near separability in prolate spheroidal coordinates. For fixed lambda , however, a clear mixing of R, mu nodes is demonstrated. This corresponds to a breakdown of the adiabatic approximation and can be understood in terms of the classical two-electron motion
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