3 papers
quant-ph2026
Quantum Process Tomography of a Thermal Alkali-Metal Vapor
Yujie Sun, Marek Kopciuch, Arash Dezhang Fard +1
Characterizing the open-system dynamics of multilevel quantum systems (qudits) remains a fundamental challenge due to ensemble inhomogeneities and complex environmental interaction…
quant-ph2025
Liouvillian and Hamiltonian exceptional points of atomic vapors: The spectral signatures of quantum jumps
Marek Kopciuch, Adam Miranowicz
We investigate spectral singularities in an alkali-metal atomic vapor modeled using four and effectively three hyperfine states. By comparing the eigenvalue spectra of a non-Hermit…
quant-ph2024
Isolating Pure Quadratic Zeeman Splitting
Arash Dezhang Fard, Marek Kopciuch, Yujie Sun +2
Nonlinear magnetic interactions provide access to complex quantum spin dynamics and thus enable the study of intriguing physical phenomena. However, these interactions are often do…