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QUROPE - aggregated feeds in category PhysicsenarXiv.org: Quantum Physics: An example of use of Variational Methods in Quantum Machine Learning. (arXiv:2208.04316v1 [quant-ph])
http://arxiv.org/abs/2208.04316
<p>This paper introduces a deep learning system based on a quantum neural
network for the binary classification of points of a specific geometric pattern
(Two-Moons Classification problem) on a plane. We believe that the use of
hybrid deep learning systems (classical + quantum) can reasonably bring
benefits, not only in terms of computational acceleration but in understanding
the underlying phenomena and mechanisms; that will lead to the creation of new
forms of machine learning, as well as to a strong development in the world of
quantum computation.<p><a href="http://arxiv.org/abs/2208.04316">read more</a></p>
Wed, 10 Aug 2022 03:45:18 +0200arXiv.org: Quantum Physics: Open Quantum Random Walks and Quantum Markov chains on Trees II: The recurrence. (arXiv:2208.04320v1 [math-ph])
http://arxiv.org/abs/2208.04320
<p>In the present paper, we construct QMC (Quantum Markov Chains) associated
with Open Quantum Random Walks such that the transition operator of the chain
is defined by OQRW and the restriction of QMC to the commutative subalgebra
coincides with the distribution of OQRW. Furthermore, we first propose a new
construction of QMC on trees, which is an extension of QMC considered in Ref.
[9]. Using such a construction, we are able to construct QMCs on tress
associated with OQRW. Our investigation leads to the detection of the phase
transition phenomena within the proposed scheme.<p><a href="http://arxiv.org/abs/2208.04320">read more</a></p>
Wed, 10 Aug 2022 03:45:18 +0200arXiv.org: Quantum Physics: On the Role of Quantum Communication and Loss in Attacks on Quantum Position Verification. (arXiv:2208.04341v1 [quant-ph])
http://arxiv.org/abs/2208.04341
<p>We study the role of quantum communication in attacks on quantum position
verification. In this work, we construct the first known example of a QPV
protocol that is provably secure against unentangled attackers restricted to
classical communication, but can be perfectly attacked by local operations and
a single round of simultaneous quantum communication indicating that allowing
for quantum communication may break security. We also show that any protocol
secure against classical communication can be transformed into a protocol
secure against quantum communication.<p><a href="http://arxiv.org/abs/2208.04341">read more</a></p>
Wed, 10 Aug 2022 03:45:18 +0200arXiv.org: Quantum Physics: Many-body cavity quantum electrodynamics with driven inhomogeneous emitters. (arXiv:2208.04345v1 [quant-ph])
http://arxiv.org/abs/2208.04345
<p>Quantum emitters coupled to optical resonators are quintessential systems for
exploring fundamental phenomena in cavity quantum electrodynamics (cQED) and
are commonly used in quantum devices acting as qubits, memories and
transducers. Many previous experimental cQED studies have focused on regimes
where a small number of identical emitters interact with a weak external drive,
such that the system can be described with simple effective models.<p><a href="http://arxiv.org/abs/2208.04345">read more</a></p>
Wed, 10 Aug 2022 03:45:18 +0200arXiv.org: Quantum Physics: Stochastic versus periodic quantum collision models. (arXiv:2208.04353v1 [quant-ph])
http://arxiv.org/abs/2208.04353
<p>Most literature on quantum collision models (CMs) usually considers periodic
weak collisions featuring a fixed waiting time between two next collisions.
Some works have yet addressed CMs with random waiting time and strong
collisions (stochastic CMs).<p><a href="http://arxiv.org/abs/2208.04353">read more</a></p>
Wed, 10 Aug 2022 03:45:18 +0200arXiv.org: Quantum Physics: Predicting the minimum control time of quantum protocols with artificial neural networks. (arXiv:2208.04362v1 [quant-ph])
http://arxiv.org/abs/2208.04362
<p>Quantum control relies on the driving of quantum states without the loss of
coherence, thus the leakage of quantum properties onto the environment over
time is a fundamental challenge. One work-around is to implement fast
protocols, hence the Minimal Control Time (MCT) is of upmost importance. Here,
we employ a machine learning network in order to estimate the MCT in a state
transfer protocol. An unsupervised learning approach is considered by using a
combination of an autoencoder network with the k-means clustering tool.<p><a href="http://arxiv.org/abs/2208.04362">read more</a></p>
Wed, 10 Aug 2022 03:45:18 +0200arXiv.org: Quantum Physics: A QUBO model of the RNA folding problem optimized by variational hybrid quantum annealing. (arXiv:2208.04367v1 [quant-ph])
http://arxiv.org/abs/2208.04367
<p>RNAs self-interact through hydrogen-bond base-pairing between nucleotides and
fold into specific, stable structures that substantially govern their
biochemical behaviour. Experimental characterization of these structures
remains difficult, hence the desire to predict them computationally from
sequence information.<p><a href="http://arxiv.org/abs/2208.04367">read more</a></p>
Wed, 10 Aug 2022 03:45:18 +0200arXiv.org: Quantum Physics: Generalization and Overfitting in Matrix Product State Machine Learning Architectures. (arXiv:2208.04372v1 [cs.LG])
http://arxiv.org/abs/2208.04372
<p>While overfitting and, more generally, double descent are ubiquitous in
machine learning, increasing the number of parameters of the most widely used
tensor network, the matrix product state (MPS), has generally lead to monotonic
improvement of test performance in previous studies. To better understand the
generalization properties of architectures parameterized by MPS, we construct
artificial data which can be exactly modeled by an MPS and train the models
with different number of parameters.<p><a href="http://arxiv.org/abs/2208.04372">read more</a></p>
Wed, 10 Aug 2022 03:45:18 +0200arXiv.org: Quantum Physics: One Hundred Years Later: Stern-Gerlach Experiment and Dimension Witnesses. (arXiv:2208.04377v1 [quant-ph])
http://arxiv.org/abs/2208.04377
<p>Inspired by the one-hundredth anniversary of the seminal works of Stern and
Gerlach, our contribution is a proposal of how to use their famous experiment
in a more contemporary perspective. Our main idea is to re-cast the experiment
in the modern language of prepare-and-measure scenarios. By doing so, it is
possible to connect geometric and algebraic aspects of the space of states with
the physical space. We also discuss possible simulations of the SG experiment
as well as some experimental properties of the experiment revealed at the
statistical level.<p><a href="http://arxiv.org/abs/2208.04377">read more</a></p>
Wed, 10 Aug 2022 03:45:18 +0200arXiv.org: Quantum Physics: Quantum Finance: a tutorial on quantum computing applied to the financial market. (arXiv:2208.04382v1 [q-fin.PM])
http://arxiv.org/abs/2208.04382
<p>Previously only considered a frontier area of Physics, nowadays quantum
computing is one of the fastest growing research field, precisely because of
its technological applications in optimization problems, machine learning,
information security and simulations. The goal of this article is to introduce
the fundamentals of quantum computing, focusing on a promising quantum
algorithm and its application to a financial market problem. More specifically,
we discuss the portfolio optimization problem using the \textit{Quantum
Approximate Optimization Algorithm} (QAOA).<p><a href="http://arxiv.org/abs/2208.04382">read more</a></p>
Wed, 10 Aug 2022 03:45:18 +0200