Should institutions of higher learning make service a graduation requirement?

Even if initially this does not sound appealing, required service will show young people some realities and will also make them feel very good about themselves

Probing Quantum Interference Effects in the Work Distribution

What is the role of coherence in determining the distribution of work done on a quantum system? We approach this question from an operational perspective and consider a setup in which the internal energy of a closed system is recorded by a quantum detector before and after the system is acted upon by an external drive. We find that the resulting work distribution depends on the initial state of the detector as well as on the choice of the final measurement. We consider two complementary measurement schemes, both of which show clear signatures of quantum interference. We specifically discuss how to implement these schemes in the circuit QED architecture, using an artificial atom as the system and a quantized mode of the electromagnetic field as the detector. Different measurement schemes can be realized by preparing the field either in a superposition of Fock states or in a coherent state and exploiting state-of-the art techniques for the characterization of microwave radiation at the quantum level. More generally, the single bosonic mode we utilize is arguably the minimal quantum detector capable of capturing the complementary aspects of the work distribution discussed here.Comment: 12 pages, 3 figure

Full distribution of work done on a quantum system for arbitrary initial states

We propose a novel approach to define and measure the statistics of work, internal energy and dissipated heat in a driven quantum system. In our framework the presence of a physical detector arises naturally and work and its statistics can be investigated in the most general case. In particular, we show that the quantum coherence of the initial state can lead to measurable effects on the moments of the work done on the system. At the same time, we recover the known results if the initial state is a statistical mixture of energy eigenstates. Our method can also be applied to measure the dissipated heat in an open quantum system. By sequentially coupling the system to a detector, we can track the energy dissipated in the environment while accessing only the system degrees of freedom.Comment: 8 pages, 2 figures. Title change

Which European model for elderly care? Equity and cost-effectiveness in home based care in three European countries

Long term care for the elderly is growing apace in developed economies. As growth is forcing change in existing production and delivery systems of elderly care services, the question arises as to how different systems compare in terms of cost-effectiveness, equity or quality. Based on an in depth survey carried out in Denmark, Ireland and Italy – the GALCA survey – this articles compares prevailing arrangements of home based long-term care in these three countries, focussing on the overall cost-effectiveness of the provisions as well as on employment equity for the care workers. Comparison between alternative types of provisions within each country suggests that home based care is generally, although not consistently, more cost-effective than care within institutions. Comparison of home care provisions across the three countries suggests that the Italian and the Danish systems are the most cost effective, but the Danish system is more equitable, overall. These latter findings are partly explained by progressive replacement in Italy of unpaid family carers with low cost immigrant workers directly employed by the families and often cohabiting with the elderly, the migrant-in-the-family model of long term care. This new model has spread across Southern Europe and raises complex issues of equity and sustainability from an employment perspective.elderly care; long term care; cost-effectiveness; migration; welfare

Which European model for elderly care? Equity and cost-effectiveness in home based care in three European countries

Long term care for the elderly is growing apace in developed economies. As growth is forcing change in existing production and delivery systems of elderly care services, the question arises as to how different systems compare in terms of cost-effectiveness, equity or quality. Based on an in depth survey carried out in Denmark, Ireland and Italy – the GALCA survey – this articles compares prevailing arrangements of home based long-term care in these three countries, focussing on the overall cost-effectiveness of the provisions as well as on employment equity for the care workers. Comparison between alternative types of provisions within each country suggests that home based care is generally, although not consistently, more cost-effective than care within institutions. Comparison of home care provisions across the three countries suggests that the Italian and the Danish systems are the most cost effective, but the Danish system is more equitable, overall. These latter findings are partly explained by progressive replacement in Italy of unpaid family carers with low cost immigrant workers directly employed by the families and often cohabiting with the elderly, the migrant-in-the-family model of long term care. This new model has spread across Southern Europe and raises complex issues of equity and sustainability from an employment perspective.ederly care, cost-effectiveness, migration, welfare

A Microwave Josephson Refrigerator

We present a microwave quantum refrigeration principle based on the Josephson effect. When a superconducting quantum interference device (SQUID) is pierced by a time-dependent magnetic flux, it induces changes in the macroscopic quantum phase and an effective finite bias voltage appears across the SQUID. This voltage can be used to actively cool well below the lattice temperature one of the superconducting electrodes forming the interferometer. The achievable cooling performance combined with the simplicity and scalability intrinsic to the structure pave the way to a number of applications in quantum technology.Comment: 6 pages, 3 figure

Radiation comb generation with extended Josephson junctions

We propose the implementation of a Josephson radiation comb generator (JRCG) based on an extended Josephson junction subject to a time dependent magnetic field. The junction critical current shows known diffraction patterns and determines the position of the critical nodes when it vanishes. When the magnetic flux passes through one of such critical nodes, the superconducting phase must undergo a $\pi$-jump to minimize the Josephson energy. Correspondingly a voltage pulse is generated at the extremes of the junction. Under periodic driving this allows us to produce a comb-like voltage pulses sequence. In the frequency domain it is possible to generate up to hundreds of harmonics of the fundamental driving frequency, thus mimicking the frequency comb used in optics and metrology. We discuss several implementations through a rectangular, cylindrical and annular junction geometries, allowing us to generate different radiation spectra and to produce an output power up to $10$~pW at $50$~GHz for a driving frequency of $100$~MHz.Comment: 4+ pages, 4 color figure