16 research outputs found
Exploring Quantum Neural Networks for the Discovery and Implementation of Quantum Error-Correcting Codes
We investigate the use of Quantum Neural Networks for discovering and
implementing quantum error-correcting codes. Our research showcases the
efficacy of Quantum Neural Networks through the successful implementation of
the Bit-Flip quantum error-correcting code using a Quantum Autoencoder,
effectively correcting bit-flip errors in arbitrary logical qubit states.
Additionally, we employ Quantum Neural Networks to restore states impacted by
Amplitude Damping by utilizing an approximative 4-qubit error-correcting
codeword. Our models required modification to the initially proposed Quantum
Neural Network structure to avoid barren plateaus of the cost function and
improve training time. Moreover, we propose a strategy that leverages Quantum
Neural Networks to discover new encryption protocols tailored for specific
quantum channels. This is exemplified by learning to generate logical qubits
explicitly for the bit-flip channel. Our modified Quantum Neural Networks
consistently outperformed the standard implementations across all tasks
T-wave Inversion through Inhomogeneous Voltage Diffusion within the FK3V Cardiac Model
The heart beats due to the synchronized contraction of cardiomyocytes
triggered by a periodic sequence of electrical signals called action
potentials, which originate in the sinoatrial node and spread through the
heart's electrical system. A large body of work is devoted to modeling the
propagation of the action potential and to reproducing reliably its shape and
duration. Connection of computational modeling of cells to macroscopic
phenomenological curves such as the electrocardiogram has been also intense,
due to its clinical importancce in analyzing cardiovascular diseases. In this
work we simulate the dynamics of action potential propagation using the
three-variable Fenton-Karma model that can account for both normal and damaged
cells through spatially inhomogeneous voltage diffusion coefficient. We monitor
the action potential propagation in the cardiac tissue and calculate the
pseudo-electrocardiogram that reproduces the R and T waves. The R wave
amplitude varies according to a double exponential law as a function of the
(spatially homogeneous, for an isotropic tissue) diffusion coefficient. The
addition of spatial inhomogeneity in the diffusion coefficient by means of a
defected region representing damaged cardiac cells, may result in T-wave
inversion in the calculated pseudo-electrocardiogram. The transition from
positive to negative polarity of the T-wave is analyzed as a function of the
length and the depth of the defected region.Comment: 12 pages, figures, 39 reference
High laser induced damage threshold photoresists for nano-imprint and 3D multi-photon lithography
Optics manufacturing technology is predicted to play a major role in the future production of integrated photonic circuits. One of the major drawbacks in the realization of photonic circuits is the damage of optical materials by intense laser pulses. Here, we report on the preparation of a series of organic-inorganic hybrid photoresists that exhibit enhanced laser-induced damage threshold. These photoresists showed to be candidates for the fabrication of micro-optical elements (MOEs) using three-dimensional multiphoton lithography. Moreover, they demonstrate pattern ability by nanoimprint lithography, making them suitable for future mass production of MOEs
Synthesis and application of triphenylamine-based aldehydes as photo-initiators for multi-photon lithography
International audiencePhotopolymerization of (meth)acrylate-based formulations has become a widespread method for industry due to the high energy efficiency and low curing times of this technology. Various products from simple coatings to more complex applications such as additive manufacturing technologies are based on this versatile method. Common industrial radical photoinitiators are generally based on aromatic ketones. Benzaldehyde is an organic compound consisting of a benzene ring with a formyl substituent. It is the simplest aromatic aldehyde and one of the most industrially useful; for instance in the preparation of various aniline dyes, perfumes, flavorings, and pharmaceutics. Parallel to this, triphenylamines are extensively used for the design of dyes used for solar energy conversion. In this work, three triphenylamine derivatives bearing formyl groups are as a new substance class of multi-photon lithography photoinitiators. Besides their efficient formulations, they show high biocompatibilty by investigating the adhesion, viability and proliferation of dental stem cells on photopolymerized thin films