4,277 research outputs found
UMSL Bulletin 2023-2024
The 2023-2024 Bulletin and Course Catalog for the University of Missouri St. Louis.https://irl.umsl.edu/bulletin/1088/thumbnail.jp
Optimality and Complexity in Measured Quantum-State Stochastic Processes
If an experimentalist observes a sequence of emitted quantum states via
either projective or positive-operator-valued measurements, the outcomes form a
time series. Individual time series are realizations of a stochastic process
over the measurements' classical outcomes. We recently showed that, in general,
the resulting stochastic process is highly complex in two specific senses: (i)
it is inherently unpredictable to varying degrees that depend on measurement
choice and (ii) optimal prediction requires using an infinite number of
temporal features. Here, we identify the mechanism underlying this
complicatedness as generator nonunifilarity -- the degeneracy between sequences
of generator states and sequences of measurement outcomes. This makes it
possible to quantitatively explore the influence that measurement choice has on
a quantum process' degrees of randomness and structural complexity using
recently introduced methods from ergodic theory. Progress in this, though,
requires quantitative measures of structure and memory in observed time series.
And, success requires accurate and efficient estimation algorithms that
overcome the requirement to explicitly represent an infinite set of predictive
features. We provide these metrics and associated algorithms, using them to
design informationally-optimal measurements of open quantum dynamical systems.Comment: 31 pages, 6 appendices, 22 figures;
http://csc.ucdavis.edu/~cmg/compmech/pubs/qdic.ht
Multilingualism and the Public Sector in South Africa
This book contributes to the discourse on language in South Africa with a specific focus on multilingualism and the public sector
Assembling Single RbCs Molecules with Optical Tweezers
Optical tweezer arrays are useful tools for manipulating single atoms and molecules.
An exciting avenue for research with optical tweezers is using the interactions between polar molecules for quantum computation or quantum simulation.
Molecules can be assembled in an optical tweezer array starting from pairs of atoms.
The atoms must be initialised in the relative motional ground state of a common trap.
This work outlines the design of a Raman sideband cooling protocol which is implemented to prepare an 87-Rubidium atom in the motional ground state of an 817 nm tweezer, and a 133-Caesium atom in the motional ground state of a 938 nm tweezer.
The protocol circumvents strong heating and dephasing associated with the trap by operating at lower trap depths and cooling from outside the Lamb-Dicke regime.
By analysing several sources of heating, we design and implement a merging sequence that transfers the Rb atom and the Cs atom to a common trap with minimal motional excitation.
Subsequently, we perform a detailed characterisation of AC Stark shifts caused by the tweezer light, and identify several situations in which the confinement of the atom pair influences their interactions.
Then, we demonstrate the preparation of a molecular bound state after an adiabatic ramp across a magnetic Feshbach resonance.
Measurements of molecular loss rates provide evidence that the atoms are in fact associated during the merging sequence, before the magnetic field ramp.
By preparing a weakly-bound molecule in an optical tweezer, we carry out important steps towards assembling an array of ultracold RbCs molecules in their rovibrational ground states
Pontryagin-Optimal Control of a non-Hermitian Qubit
Open-system quantum dynamics described by non-Hermitian effective
Hamiltonians have become a subject of considerable interest. Studies of
non-Hermitian physics have revealed general principles, including relationships
between the topology of the complex eigenvalue space and the breakdown of
adiabatic control strategies. We study here the control of a single
non-Hermitian qubit, similar to recently realized experimental systems in which
the non-Hermiticity arises from an open spontaneous emission channel. We review
the topological features of the resulting non-Hermitian Hamiltonian and then
present two distinct results. First, we illustrate how to realize any
continuous and differentiable pure-state trajectory in the dynamics of a qubit
that are conditioned on no emission. This result implicitly provides a
workaround for the breakdown of standard adiabatic following in such
non-Hermitian systems. Second, we use Pontryagin's maximum principle to derive
optimal trajectories connecting boundary states on the Bloch sphere, using a
cost function which balances the desired dynamics against the controller energy
used to realize them. We demonstrate that the latter approach can effectively
find trajectories which maintain high state purity even in the case of
inefficient detection.Comment: 8 + 8 Pages, 7 Figure
Work fluctuations and entanglement in quantum batteries
We consider quantum batteries given by composite interacting quantum systems
in terms of the thermodynamic work cost of local random unitary processes. We
characterize quantum correlations by monitoring the average energy change and
its fluctuations in the high-dimensional bipartite systems. We derive a
hierarchy of bounds on high-dimensional entanglement (the so-called Schmidt
number) from the work fluctuations and thereby show that larger work
fluctuations can verify the presence of stronger entanglement in the system.
Finally, we develop two-point measurement protocols with noisy detectors that
can estimate work fluctuations, showing that the dimensionality of entanglement
can be probed in this manner.Comment: 16 pages, 3 figure
Voicing Kinship with Machines: Diffractive Empathetic Listening to Synthetic Voices in Performance.
This thesis contributes to the field of voice studies by analyzing the design and production of synthetic voices in performance. The work explores six case studies, consisting of different performative experiences of the last decade (2010- 2020) that featured synthetic voice design. It focusses on the political and social impact of synthetic voices, starting from yet challenging the concepts of voice in the machine and voice of the machine. The synthetic voices explored are often playing the role of simulated artificial intelligences, therefore this thesis expands its questions towards technology at large. The analysis of the case studies follows new materialist and posthumanist premises, yet it tries to confute the patriarchal and neoliberal approach towards technological development through feminist and de-colonial approaches, developing a taxonomy for synthetic voices in performance. Chapter 1 introduces terms and explains the taxonomy. Chapter 2 looks at familiar representations of fictional AI. Chapter 3 introduces headphone theatre exploring immersive practices. Chapters 4 and 5 engage with chatbots. Chapter 6 goes in depth exploring Human and Artificial Intelligence interaction, whereas chapter 7 moves slightly towards music production and live art. The body of the thesis includes the work of Pipeline Theatre, Rimini Protokoll, Annie Dorsen, Begüm Erciyas, and Holly Herndon. The analysis is informed by posthumanism, feminism, and performance studies, starting from my own practice as sound designer and singer, looking at aesthetics of reproduction, audience engagement, and voice composition. This thesis has been designed to inspire and provoke practitioners and scholars to explore synthetic voices further, question predominant biases of binarism and acknowledge their importance in redefining technology
2023-2024 Undergraduate Catalog
2023-2024 undergraduate catalog for Morehead State University
Quantum-Inspired Machine Learning: a Survey
Quantum-inspired Machine Learning (QiML) is a burgeoning field, receiving
global attention from researchers for its potential to leverage principles of
quantum mechanics within classical computational frameworks. However, current
review literature often presents a superficial exploration of QiML, focusing
instead on the broader Quantum Machine Learning (QML) field. In response to
this gap, this survey provides an integrated and comprehensive examination of
QiML, exploring QiML's diverse research domains including tensor network
simulations, dequantized algorithms, and others, showcasing recent
advancements, practical applications, and illuminating potential future
research avenues. Further, a concrete definition of QiML is established by
analyzing various prior interpretations of the term and their inherent
ambiguities. As QiML continues to evolve, we anticipate a wealth of future
developments drawing from quantum mechanics, quantum computing, and classical
machine learning, enriching the field further. This survey serves as a guide
for researchers and practitioners alike, providing a holistic understanding of
QiML's current landscape and future directions.Comment: 56 pages, 13 figures, 8 table
2023-2024 Boise State University Undergraduate Catalog
This catalog is primarily for and directed at students. However, it serves many audiences, such as high school counselors, academic advisors, and the public. In this catalog you will find an overview of Boise State University and information on admission, registration, grades, tuition and fees, financial aid, housing, student services, and other important policies and procedures. However, most of this catalog is devoted to describing the various programs and courses offered at Boise State
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