Quasiprobability distributions in open quantum systems: Spin-qubit systems

• The behavior of the well-known Wigner, PP, and QQ quasiprobability distributions are studied for a number of spin systems.
• Spin-qubit systems studied here includes single, two and three qubit states, and NN qubit Dicke model.
• Comprehensive analysis of quasiprobability distributions for spin-qubit systems is performed under general open system effects.
• Both pure dephasing as well as dissipation effects are studied.

We study nonclassical features in a number of spin-qubit systems including single, two and three qubit states, as well as an NN qubit Dicke model and a spin-1 system, of importance in the fields of quantum optics and information. This is done by analyzing the behavior of the well known Wigner, PP, and QQ quasiprobability distributions on them. We also discuss the not so well known FF function and specify its relation to the Wigner function. Here we provide a comprehensive analysis of quasiprobability distributions for spin-qubit systems under general open system effects, including both pure dephasing as well as dissipation. This makes it relevant from the perspective of experimental implementation.