Certification of unbounded randomness with arbitrary noise
Shubhayan Sarkar
Phys. Rev. A 111, L010201 (2025) - Published 2 January, 2025
The author devises a scheme to certify limitless randomness using everyday noise like thermal radiation, making ultrasecure cryptography more achievable. The scheme is based on the maximal violation of the well-known Leggett-Garg inequalities and thus can be implemented using current technology.
Quasiperiodic Floquet-Gibbs states in Rydberg atomic systems
Wilson S. Martins, Federico Carollo, Kay Brandner, and Igor Lesanovsky
Phys. Rev. A 111, L010202 (2025) - Published 7 January, 2025
The authors explore the emergence of universal steady states in quasi-periodically driven interacting Rydberg systems in contact with a thermal environment. Their work highlights the potential of fast periodic driving at incommensurate frequencies to engineer new types of quantum matter and thermal machines.
Experimental demonstration of single-spin Stirling engine cycles with enhanced efficiency
P.-D. Li, G.-Y. Ding, J.-Q. Zhang, Q. Yuan, S.-Q. Dai, T.-H. Cui, F. Zhou, L. Chen, Q. Zhong, H. Jing, Ş. K. Özdemir, and M. Feng
Phys. Rev. A 111, L010203 (2025) - Published 21 January, 2025
The authors demonstrate the performance of quantum Stirling cycles at the single-ion level. The experimental results highlight that elaborately introduced dephasing can enhance the efficiency of the quantum Stirling engine.


















