6,594 research outputs found
Post hoc verification of quantum computation
With recent progress on experimental quantum information processing, an
important question has arisen as to whether it is possible to verify arbitrary
computation performed on a quantum processor. A number of protocols have been
proposed to achieve this goal, however all are interactive in nature, requiring
that the computation be performed in an interactive manner with back and forth
communication between the verifier and one or more provers. Here we propose two
methods for verifying quantum computation in a non-interactive manner based on
recent progress in the understanding of the local Hamiltonian problem. Provided
that the provers compute certain witnesses for the computation, this allows the
result of a quantum computation to be verified after the fact, a property not
seen in current verification protocols.Comment: 4 pages, 2 figure
Coulomb analogy for nonhermitian degeneracies near quantum phase transitions
Degeneracies near the real axis in a complex-extended parameter space of a
hermitian Hamiltonian are studied. We present a method to measure distributions
of such degeneracies on the Riemann sheet of a selected level and apply it in
classification of quantum phase transitions. The degeneracies are shown to
behave similarly as complex zeros of a partition function.Comment: 4 page
Effects of the California High School Exit Exam on Student Persistence, Achievement, and Graduation
Analyzes the impact of the exit exam requirement on student persistence, achievement, and graduation by race/ethnicity and gender and the factors behind the differential effects. Considers implications for the fairness and effectiveness of the exams
Advanced Medical Imaging in Privately Insured Patients Recent Trends in Utilization and Payments
Boston University Health Policy Institut
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