211 research outputs found
Entwicklung und Erprobung einer Waermeleitzelle zur Messung des UFâ-Gehaltes im Verfahrensgas einer Trennduesenanlage
The 2015 Fillmore Earthquake Swarm and Possible Crustal Deformation Mechanisms near the Bottom of the Eastern Ventura Basin, California
The 2015 Fillmore swarm occurred about 6 km west of the city of Fillmore in Ventura, California, and was located beneath the eastern part of the actively subsiding Ventura basin at depths from 11.8 to 13.8 km, similar to two previous swarms in the area. Templateâmatching event detection showed that it started on 5 July 2015 at 2:21 UTC with an M âŒ1.0 earthquake. The swarm exhibited unusual episodic spatial and temporal migrations and unusual diversity in the nodal planes of the focal mechanisms as compared to the simple hypocenterâdefined plane. It was also noteworthy because it consisted of >1400 events of M â„ 0.0, with M 2.8 being the largest event. We suggest that fluids released by metamorphic dehydration processes, migration of fluids along a detachment zone, and cascading asperity failures caused this prolific earthquake swarm, but other mechanisms (such as simple mainshockâaftershock stress triggering or a regional aseismic creep event) are less likely. Dilatant strengthening may be a mechanism that causes the temporal decay of the swarm as poreâpressure drop increased the effective normal stress, and counteracted the instability driving the swarm
Relational interpretation of the wave function and a possible way around Bell's theorem
The famous ``spooky action at a distance'' in the EPR-szenario is shown to be
a local interaction, once entanglement is interpreted as a kind of ``nearest
neighbor'' relation among quantum systems. Furthermore, the wave function
itself is interpreted as encoding the ``nearest neighbor'' relations between a
quantum system and spatial points. This interpretation becomes natural, if we
view space and distance in terms of relations among spatial points. Therefore,
``position'' becomes a purely relational concept. This relational picture leads
to a new perspective onto the quantum mechanical formalism, where many of the
``weird'' aspects, like the particle-wave duality, the non-locality of
entanglement, or the ``mystery'' of the double-slit experiment, disappear.
Furthermore, this picture cirumvents the restrictions set by Bell's
inequalities, i.e., a possible (realistic) hidden variable theory based on
these concepts can be local and at the same time reproduce the results of
quantum mechanics.Comment: Accepted for publication in "International Journal of Theoretical
Physics
High-fidelity state detection and tomography of a single ion Zeeman qubit
We demonstrate high-fidelity Zeeman qubit state detection in a single trapped
88 Sr+ ion. Qubit readout is performed by shelving one of the qubit states to a
metastable level using a narrow linewidth diode laser at 674 nm followed by
state-selective fluorescence detection. The average fidelity reached for the
readout of the qubit state is 0.9989(1). We then measure the fidelity of state
tomography, averaged over all possible single-qubit states, which is 0.9979(2).
We also fully characterize the detection process using quantum process
tomography. This readout fidelity is compatible with recent estimates of the
detection error-threshold required for fault-tolerant computation, whereas
high-fidelity state tomography opens the way for high-precision quantum process
tomography
Entangled graphs: Bipartite entanglement in multi-qubit systems
Quantum entanglement in multipartite systems cannot be shared freely. In
order to illuminate basic rules of entanglement sharing between qubits we
introduce a concept of an entangled structure (graph) such that each qubit of a
multipartite system is associated with a point (vertex) while a bi-partite
entanglement between two specific qubits is represented by a connection (edge)
between these points. We prove that any such entangled structure can be
associated with a pure state of a multi-qubit system. Moreover, we show that a
pure state corresponding to a given entangled structure is a superposition of
vectors from a subspace of the -dimensional Hilbert space, whose dimension
grows linearly with the number of entangled pairs.Comment: 6 revtex pages, 2 figures, to appear in Phys. Rev.
On Multiparticle Entanglement via Resonant Interaction between Light and atomic Ensembles
Multiparticle entangled states generated via interaction between narrow-band
light and an ensemble of identical two-level atoms are considered. Depending on
the initial photon statistics, correlation between atoms and photons can give
rise to entangled states of these systems. It is found that the state of any
pair of atoms interacting with weak single-mode squeezed light is inseparable
and robust against decay. Optical schemes for preparing entangled states of
atomic ensembles by projective measurement are described.Comment: 11 pages, 1 figure, revtex
The 2015 Fillmore Earthquake Swarm and Possible Crustal Deformation Mechanisms near the Bottom of the Eastern Ventura Basin, California
The 2015 Fillmore swarm occurred about 6 km west of the city of Fillmore in Ventura, California, and was located beneath the eastern part of the actively subsiding Ventura basin at depths from 11.8 to 13.8 km, similar to two previous swarms in the area. Templateâmatching event detection showed that it started on 5 July 2015 at 2:21 UTC with an M âŒ1.0 earthquake. The swarm exhibited unusual episodic spatial and temporal migrations and unusual diversity in the nodal planes of the focal mechanisms as compared to the simple hypocenterâdefined plane. It was also noteworthy because it consisted of >1400 events of M â„ 0.0, with M 2.8 being the largest event. We suggest that fluids released by metamorphic dehydration processes, migration of fluids along a detachment zone, and cascading asperity failures caused this prolific earthquake swarm, but other mechanisms (such as simple mainshockâaftershock stress triggering or a regional aseismic creep event) are less likely. Dilatant strengthening may be a mechanism that causes the temporal decay of the swarm as poreâpressure drop increased the effective normal stress, and counteracted the instability driving the swarm
The 2015 Fillmore Earthquake Swarm and Possible Crustal Deformation Mechanisms near the Bottom of the Eastern Ventura Basin, California
Massively parallel quantum chemistry: PFAS on over 1 million cloud vCPUs
Accurate solutions to the electronic Schr\"odinger equation can provide
valuable insight for electron interactions within molecular systems,
accelerating the molecular design and discovery processes in many different
applications. However, the availability of such accurate solutions are limited
to small molecular systems due to both the extremely high computational
complexity and the challenge of operating and executing these workloads on
high-performance compute clusters. This work presents a massively scalable
cloud-based quantum chemistry platform by implementing a highly parallelizable
quantum chemistry method that provides a polynomial-scaling approximation to
full configuration interaction (FCI). Our platform orchestrates more than one
million virtual CPUs on the cloud to analyze the bond-breaking behaviour of
carbon-fluoride bonds of per- and polyfluoroalkyl substances (PFAS) with
near-exact accuracy within the chosen basis set. This is the first quantum
chemistry calculation utilizing more than one million virtual CPUs on the cloud
and is the most accurate electronic structure computation of PFAS bond breaking
to date
The writing on the wall: the concealed communities of the East Yorkshire horselads
This paper examines the graffiti found within late nineteenth and early-twentieth century farm buildings in the Wolds of East Yorkshire. It suggests that the graffiti were created by a group of young men at the bottom of the social hierarchy - the horselads â and was one of the ways in which they constructed a distinctive sense of communal identity, at a particular stage in their lives. Whilst it tells us much about changing agricultural regimes and social structures, it also informs us about experiences and attitudes often hidden from official histories and biographies. In this way, the graffiti are argued to inform our understanding, not only of a concealed community, but also about their hidden histor
- âŠ