Optimal control in nearly adiabatic two-level quantum systems via time-dependent resonance
Takayuki Suzuki
Phys. Rev. A 111, L050201 (2025) - Published 9 May, 2025
A time-dependent resonance approach enables high-fidelity state control in nearly-adiabatic two-level quantum systems, offering a practical and analytically supported alternative to traditional adiabatic protocols.
Manifolds of exceptional points and effective Zeno limit of an open two-qubits system
Vladislav Popkov, Carlo Presilla, and Mario Salerno
Phys. Rev. A 111, L050202 (2025) - Published 19 May, 2025
Analytical investigations of the Liouvillian exceptional point manifolds (LEPM) of a two-qubit open system reveal a phase diagram for effective Zeno transitions at small dissipation. Notably, the fastest relaxation to the non-equilibrium steady state occurs nearby LEPMs associated with the effective Zeno regime.
Generalization of exact operators of the Foldy-Wouthuysen transformation to arbitrary-spin particles in nonstationary fields
Alexander J. Silenko
Phys. Rev. A 111, L050203 (2025) - Published 29 May, 2025
Exact nonexponential and exponential operators of the Foldy-Wouthuysen transformation for arbitrary-spin particles are determined in the nonstationary case. Some fundamental properties of these operators and the Foldy-Wouthuysen Hamiltonian are also identified.

















