4,506 research outputs found
Intersubband transitions in pseudomorphic InGaAs/GaAs/AlGaAs multiple step quantum wells
Intersubband transitions from the ground state to the first and second excited states in pseudomorphic AlGaAs/InGaAs/GaAs/AlGaAs multiple step quantum wells have been observed. The step well structure has a configuration of two AlGaAs barriers confining an InGaAs/GaAs step. Multiple step wells were grown on GaAs substrate with each InGaAs layer compressively strained. During the growth, a uniform growth condition was adopted so that inconvenient long growth interruptions and fast temperature ramps when switching the materials were eliminated. The sample was examined by crossâsectional transmission electron microscopy, an xâray rocking curve technique, and the results show good crystal quality using this simple growth method. Theoretical calculations were performed to fit the intersubband absorption spectrum. The calculated energies are in good agreement with the observed peak positions for both the 1â2 and 1â3 transitions
Catalysis always degrades external quantum correlations
Catalysts used in quantum resource theories need not be in isolation and
therefore are possibly correlated with external systems, which the agent does
not have access to. Do such correlations help or hinder catalysis, and does the
classicality or quantumness of such correlations matter? To answer this
question, we first focus on the existence of a non-invasively measurable
observable that yields the same outcomes for repeated measurements, since this
signifies macro-realism, a key property distinguishing classical systems from
quantum systems. We show that a system quantumly correlated with an external
system so that the joint state is necessarily perturbed by any repeatable
quantum measurement, also has the same property against general quantum
channels. Our full characterization of such systems called totally quantum
systems, solves the open problem of characterizing tomographically sensitive
systems raised in [Lie and Jeong, Phys. Rev. Lett. 130, 020802 (2023)]. An
immediate consequence is that a totally quantum system cannot catalyze any
quantum process, even when a measure of correlation with its environment is
arbitrarily low. It generalizes to a stronger result, that the mutual
information of totally quantum systems cannot be used as a catalyst either.
These results culminate in the conclusion that, out of the correlations that a
generic quantum catalyst has with its environment, only classical correlations
allow for catalysis, and therefore using a correlated catalyst is equivalent to
using an ensemble of uncorrelated catalysts.Comment: 5+7 pages, 1 figure, Comments are welcom
Uniqueness of quantum state over time function
A fundamental asymmetry exists within the conventional framework of quantum
theory between space and time, in terms of representing causal relations via
quantum channels and acausal relations via multipartite quantum states. Such a
distinction does not exist in classical probability theory. In effort to
introduce this symmetry to quantum theory, a new framework has recently been
proposed, such that dynamical description of a quantum system can be
encapsulated by a static quantum state over time. In particular, Fullwood and
Parzygnat recently proposed the state over time function based on the Jordan
product as a promising candidate for such a quantum state over time function,
by showing that it satisfies all the axioms required in the no-go result by
Horsman et al. However, it was unclear if the axioms induce a unique state over
time function. In this work, we demonstrate that the previously proposed axioms
cannot yield a unique state over time function. In response, we therefore
propose an alternative set of axioms that is operationally motivated, and
better suited to describe quantum states over any spacetime regions beyond two
points. By doing so, we establish the Fullwood-Parzygnat state over time
function as the essentially unique function satisfying all these operational
axioms.Comment: 5+4 pages, comments welcom
Gauge Theory for Quantum Spin Glasses
The gauge theory for random spin systems is extended to quantum spin glasses
to derive a number of exact and/or rigorous results. The transverse Ising model
and the quantum gauge glass are shown to be gauge invariant. For these models,
an identity is proved that the expectation value of the gauge invariant
operator in the ferromagnetic limit is equal to the one in the classical
equilibrium state on the Nishimori line. As a result, a set of inequalities for
the correlation function are proved, which restrict the location of the ordered
phase. It is also proved that there is no long-range order in the
two-dimensional quantum gauge glass in the ground state. The phase diagram for
the quantum XY Mattis model is determined.Comment: 15 pages, 2 figure
Non-Newtonian gravity in finite nuclei
In this talk, we report our recent study of constraining the non-Newtonian
gravity at femtometer scale. We incorporate the Yukawa-type non-Newtonian
gravitational potential consistently to the Skyrme functional form using the
exact treatment for the direct contribution and density-matrix expansion method
for the exchange contribution. The effects from the non-Newtonian potential on
finite nuclei properties are then studied together with a well-tested Skyrme
force. Assuming that the framework without non-Newtonian gravity can explain
the binding energies and charge radii of medium to heavy nuclei within 2%
error, we set an upper limit for the strength of the non-Newtonian
gravitational potential at femtometer scale.Comment: Talk given at the 11th International Conference on Nucleus-Nucleus
Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear
in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS
Pengaruh Bentuk Dan Konfigurasi Agregat Terhadap Kuat Tekan Mortar
This study aimed to investigate the influence of the shape and position of aggregate to compressive strength of matrix. Research conducted so far to say that the aggregate does not really affect the compressive strength of concrete and the opinions of experts who say that the aggregate rounded shaped is the aggregate are best used in the mix concrete . Therefore, there was a suggestion in this study to examine how the aggregate effect of the concrete compressive strength if we use the aggregate shaped beam (angular). That question will be answered by laboratory testing and modeling and analysis using software (SAP 2000). To determine the effect used variations size of aggregate measuring 2 x 2 x 5 cm and 2.5 x 1.5 x 5 cm at the time of casting is also variation in the position to determine the aggregate effect on the compressive strength of matrix. Tests conducted with uniaxial loading (one-way) and use the data logger and LVDT (Linear Variable Displacement Transducer), to measure the displacement that occurs. Through this research is expected, in addition to knowing their effects on the compressive strength of concrete, can also determine its relation to the concrete cracking pattern of voltage obtained when testing and validated by using SAP 2000
Differentiation of Patients with Balance Insufficiency (Vestibular Hypofunction) versus Normal Subjects Using a Low-Cost Small Wireless Wearable Gait Sensor
Balance disorders present a significant healthcare burden due to the potential for hospitalization or complications for the patient, especially among the elderly population when considering intangible losses such as quality of life, morbidities, and mortalities. This work is a continuation of our earlier works where we now examine feature extraction methodology on Dynamic Gait Index (DGI) tests and machine learning classifiers to differentiate patients with balance problems versus normal subjects on an expanded cohort of 60 patients. All data was obtained using our custom designed low-cost wireless gait analysis sensor (WGAS) containing a basic inertial measurement unit (IMU) worn by each subject during the DGI tests. The raw gait data is wirelessly transmitted from the WGAS for real-time gait data collection and analysis. Here we demonstrate predictive classifiers that achieve high accuracy, sensitivity, and specificity in distinguishing abnormal from normal gaits. These results show that gait data collected from our very low-cost wearable wireless gait sensor can effectively differentiate patients with balance disorders from normal subjects in real-time using various classifiers. Our ultimate goal is to be able to use a remote sensor such as the WGAS to accurately stratify an individualâs risk for falls
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