16,227 research outputs found
Noise suppression in inverse weak value based phase detection
We examine the effect of different sources of technical noise on inverse weak
value-based precision phase measurements. We find that this type of measurement
is similarly robust to technical noise as related experiments in the weak value
regime. In particular, the measurements considered here are robust to additive
Gaussian white noise and angular jitter noise commonly encountered in optical
experiments. Additionally, we show the same techniques used for precision phase
measurement can be used with the same technical advantages for optical
frequency measurements.Comment: 6 pages, 4 figure
Maximum stabilizer dimension for nonproduct states
Composite quantum states can be classified by how they behave under local
unitary transformations. Each quantum state has a stabilizer subgroup and a
corresponding Lie algebra, the structure of which is a local unitary invariant.
In this paper, we study the structure of the stabilizer subalgebra for n-qubit
pure states, and find its maximum dimension to be n-1 for nonproduct states of
three qubits and higher. The n-qubit Greenberger-Horne-Zeilinger state has a
stabilizer subalgebra that achieves the maximum possible dimension for pure
nonproduct states. The converse, however, is not true: we show examples of pure
4-qubit states that achieve the maximum nonproduct stabilizer dimension, but
have stabilizer subalgebra structures different from that of the n-qubit GHZ
state.Comment: 6 page
Werner state structure and entanglement classification
We present applications of the representation theory of Lie groups to the
analysis of structure and local unitary classification of Werner states,
sometimes called the {\em decoherence-free} states, which are states of
quantum bits left unchanged by local transformations that are the same on each
particle. We introduce a multiqubit generalization of the singlet state, and a
construction that assembles these into Werner states.Comment: 9 pages, 2 figures, minor changes and corrections for version
Fatal injuries to car occupants: analysis of health and population data
Although this report was commissioned by the Department for Transport (DfT), the findings and recommendations are those of the authors and do not necessarily represent the views of the DfT. While the DfT has made every effort to ensure the information in this document is accurate, DfT does not guarantee the accuracy, completeness or usefulness of that information; and it cannot accept liability for any loss or damages of any kind resulting from reliance on the information or guidance this document contains
Classification of nonproduct states with maximum stabilizer dimension
Nonproduct n-qubit pure states with maximum dimensional stabilizer subgroups
of the group of local unitary transformations are precisely the generalized
n-qubit Greenberger-Horne-Zeilinger states and their local unitary equivalents,
for n greater than or equal to 3 but not equal to 4. We characterize the Lie
algebra of the stabilizer subgroup for these states. For n=4, there is an
additional maximal stabilizer subalgebra, not local unitary equivalent to the
former. We give a canonical form for states with this stabilizer as well.Comment: 6 pages, version 3 has a typographical correction in the displayed
equation just after numbered equation (2), and other minor correction
Combination of measurements and the BLUE method
The most accurate method to combine measurement from different experiments is
to build a combined likelihood function and use it to perform the desired
inference. This is not always possible for various reasons, hence approximate
methods are often convenient. Among those, the best linear unbiased estimator
(BLUE) is the most popular, allowing to take into account individual
uncertainties and their correlations. The method is unbiased by construction if
the true uncertainties and their correlations are known, but it may exhibit a
bias if uncertainty estimates are used in place of the true ones, in particular
if those estimated uncertainties depend on measured values. In those cases, an
iterative application of the BLUE method may reduce the bias of the combined
measurement.Comment: 10 pages, 4 figures, proceedings of the XIIth Quark Confinement and
Hadron Spectrum conference, 28/8-2/9 2016, Tessaloniki, Greec
Layers Revealed
Layers Revealed: A Documentary Featuring L.A. Contemporary Dance Company is a video thesis. The intention behind this film is set out to reveal the behind the scenes reality of concert dance, the intricacies that formulate the end product, and what it takes for a dancer to stay present in their craft. I am simply intrigued by the creative process of creating movement and believe everyone should be able to experience that reality.
My objective is to inform audiences, of all backgrounds, whether you are a dancer or a nondancer, the small details that are involved in the creative process. It is rare that people, other than the dancers and choreographer, get to be in such an intimate environment. When I watch dance performances, I envision the rehearsal and all of the collaborative efforts that factor into what makes a dance what it is on stage. This is how Layers Revealed evolved and only hope that those who have viewed and will view this film can find a deeper appreciation for the soul, love, energy, and commitment necessary to build a dance show from scratch
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