The  paper of  the  month,  chosen  by  the Editor-in-Chief,  is  "Qubit thermalization by random pulses: Asymptotic state factorization"  by H. Gzyl;

DOI: 10.12693/APhysPolA.149.17

Manipulations of simple quantum systems is one of the hot topics in modern quantum physics. A lot of attention is devoted to limitations on coherent processes due to interactions with external agents.  The paper is devoted to the study of qubits (spin ½ systems) interacting with classical noise that models interaction with the environment. Thermalisation resulting from the application of random pulses to single and two-qubit systems is the main subject. It is shown that the qubit systems become completely disentangled (i.e., their joint state becomes factorised) in the long-time limit. Although these conclusions, clearly summarized in the abstract, are physically reasonable, they are not particularly surprising. Nevertheless, the detailed analytical derivations presented in the paper are valuable, as they confirm our physical intuition. The scenario is completely realistic, and the results are fully analytical without the need to rely on numerical results. 

The paper is a nice contribution to the theoretical studies of interacting simple quantum systems and is recommended for all readers interested in modern quantum physics.

The Editor-in-Chief