2,090 research outputs found
Quantum and Classical in Adiabatic Computation
Adiabatic transport provides a powerful way to manipulate quantum states. By
preparing a system in a readily initialised state and then slowly changing its
Hamiltonian, one may achieve quantum states that would otherwise be
inaccessible. Moreover, a judicious choice of final Hamiltonian whose
groundstate encodes the solution to a problem allows adiabatic transport to be
used for universal quantum computation. However, the dephasing effects of the
environment limit the quantum correlations that an open system can support and
degrade the power of such adiabatic computation. We quantify this effect by
allowing the system to evolve over a restricted set of quantum states,
providing a link between physically inspired classical optimisation algorithms
and quantum adiabatic optimisation. This new perspective allows us to develop
benchmarks to bound the quantum correlations harnessed by an adiabatic
computation. We apply these to the D-Wave Vesuvius machine with revealing -
though inconclusive - results
Non-Abelian Vortices of Higher Winding Numbers
We make a detailed study of the moduli space of winding number two (k=2)
axially symmetric vortices (or equivalently, of co-axial composite of two
fundamental vortices), occurring in U(2) gauge theory with two flavors in the
Higgs phase, recently discussed by Hashimoto-Tong (hep-th/0506022) and
Auzzi-Shifman-Yung (hep-th/0511150). We find that it is a weighted projective
space WCP^2_(2,1,1)=CP^2/Z_2. This manifold contains an A_1-type (Z_2) orbifold
singularity even though the full moduli space including the relative position
moduli is smooth. The SU(2) transformation properties of such vortices are
studied. Our results are then generalized to U(N) gauge theory with N flavors,
where the internal moduli space of k=2 axially symmetric vortices is found to
be a weighted Grassmannian manifold. It contains singularities along a
submanifold.Comment: 32 pages, 1 figure, the final version published in PR
The Role of Migration for Workplace Safety in Italy
Using microdata from the Labour Force Survey (2009–2019) and special Labour Force Surveys conducted in 2007, 2013, and 2020 in Italy, this study examines (i) whether immigrants are more likely than native-born workers to experience occupa- tional injuries and job-related health problems and (ii) the effects of immigration on the allocation of occupational risks. We also contribute to the literature in this context by considering differences between natives and immigrants that may exist outside indi- vidual characteristics (age, gender), such as education, the age at which immigrants entered Italy and the length of stay. We find that immigrants are involved in riskier and more unsafe tasks; moreover, immigration in the last decade has led to a reduction in the average physical burden of native-born workers. Our results have important policy implications because they might be weighed against the racist sentiments of the local community
Adequacy of hospitals in Rome to an unconventional event (CBRNe). TTX simulation and HTA
Background
Rome hosts thousands of sensible targets. Healthcare reaction has been guaranteed by 6 advanced Emergency Departments (EDs) and 7 basic ones. Everyday Rome hosts 6 millions of people/die, ± 2 million in particular occasions. About National Stockpile Antidotes (SNA), Rome hosts 3 warehouses. In case of events, stockpiles are activated with a long-time call; then stockpiles are charged in delivering trucks.
Methods
Study analyzes PEIMAF (State of emergency plans for massive influx of injures) of advanced EDs in Rome and their adequacy in a possible CBRNe attack. Hypothesis of C/N attack on Saint Peter's Square during Angelus on Wednesday (at 12.00 AM) or E attack in Trastevere on Saturday (at 9.00 PM). Analysis of activation of SNA and travel times between SNA warehouse and EDs. Comparison with French EDs during Paris attacks.
Results
EDs are chronically undermanned in ordinary conditions already, and would have issues in hosting a very large number of critical patients all at once. Some hospitals do not inform their workers about PEIMAF or they do not consider CBRNe emergencies in their PEIMAF, and even if it has been considered, hardly any simulation/exercitation is ever performed. Moreover, news of the CBRNe attack may not reach immediately the healthcare personal already at work in EDs; this is extremely problematic since they could be at major risk of contamination in case of CBRNe attacks. Furthermore, without a standardize protocol active in the whole city, no cross-hospital organization can be performed.
Conclusions
All data point towards the weakness and fragmentation of actual organizative system. Time of activation and charging are crucials for first aid efficacy and efficiency; a smart call system can reduce the activation time of SNA. A better organization of SNA in major Rome hospitals can reduce delivering time and help save more lives
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