Nijholt, B. (author)

By exploiting quantum mechanics, quantum computers are able to solve problems---for example in quantum chemistry---that are far out of reach of classical computers. Conventional approaches to quantum computers use qubits (quantum bits) that can either be made out of superconducting circuits (the currently leading approach used to demonstrate quantu...

Abramovici, G.
Published in
Scientific Reports

We revisit the resolution of the one-dimensional Schrödinger hamiltonian with a Coulomb λ/|x| potential. We examine among its self-adjoint extensions those which are compatible with physical conservation laws. In the one-dimensional semi-infinite case, we show that they are classified on a U(1) circle in the attractive case and on (R,+∞)\documentcl...

Jing, Jun Guidry, Mike Wu, Lian-Ao
Published in
Scientific Reports

The stationary behavior of a quantum system is determined by its Hamiltonian and its boundary conditions. All quantum phase transitions (QPT) reported previously were induced by changing the Hamiltonian. In a circular spin model with Heisenberg XY interactions and no magnetic field, we observe an anomaly in quantum phases caused by a qualitative ch...

Ikot, A N Okorie, U S Osobonye, G Amadi, P O Edet, C O Sithole, M J Rampho, G J Sever, R
Published in
Heliyon

In this work, the thermodynamic properties of pseudo-harmonic potential in the presence of external magnetic and Aharanov-Bohm fields are investigated. The effective Boltzmann factor in the superstatistics formalism was used to obtain the thermodynamic properties such as Helmholtz free energy, Internal energy, entropy and specific heat capacity of ...

Vacchini, Bassano
Published in
Scientific Reports

We introduce a general construction of master equations with memory kernel whose solutions are given by completely positive trace-preserving maps. These dynamics going beyond the Lindblad paradigm are obtained with reference to classical renewal processes, so that they are termed quantum renewal processes. They can be described by means of semigrou...

Westerhout, Tom Astrakhantsev, Nikita Tikhonov, Konstantin S. Katsnelson, Mikhail I. Bagrov, Andrey A.
Published in
Nature Communications

Neural network representations of quantum states are hoped to provide an efficient basis for numerical methods without the need for case-by-case trial wave functions. Here the authors show that limited generalization capacity of such representations is responsible for convergence problems for frustrated systems.

Evans, Peter W.
Published in
European Journal for Philosophy of Science

Building on self-professed perspectival approaches to both scientific knowledge and causation, I explore the potentially radical suggestion that perspectivalism can be extended to account for a type of objectivity in science. Motivated by recent claims from quantum foundations that quantum mechanics must admit the possibility of observer-dependent ...

El Assyry, A. Lamsayah, M. Warad, I. Touzani, R. Bentiss, F. Zarrouk, A.
Published in
Heliyon

Energy; Physics; Computing methodology; Theoretical computer science; Molecular physics; Particle physics; Quantum mechanics; TD-DFT; PCM; Quinoxaline derivatives; Solar cells; Optoelectronic; Photovoltaic.

Kowalski, Krzysztof
Published in
Quantum Information Processing

The nonlinear generalization of the von Neumann equation preserving convexity of the state space is studied in the nontrivial case of the qutrit. This equation can be cast into the integrable classical Riccati system of nonlinear ordinary differential equations. The solutions of such system are investigated in both the linear case corresponding to ...

Noguchi, Atsushi Yamazaki, Rekishu Tabuchi, Yutaka Nakamura, Yasunobu
Published in
Nature Communications

The radiation pressure of light on a mechanical oscillator can be used to manipulate mechanical degrees of freedom in the quantum regime. Noguchi et al. use Josephson junctions to realize an artificial system where the radiation pressure of a single photon is stronger than the effect of dissipation.