Characterizing arbitrary quantum networks in the noisy intermediate-scale quantum era
Zhen-Peng Xu
Phys. Rev. A 108, L040201 (2023) - Published 5 October, 2023
Quantum networks, as a playground for various quantum technologies, describe the distribution of quantum sources represented by edges to different parties represented by nodes in the network. Here, the author introduces a systematic approach to characterize arbitrary quantum networks in the noisy intermediate-scale quantum era, which can be noisy, intermediate-scale, random, and sparse.
Simple proof that anomalous weak values require coherence
Rafael Wagner and Ernesto F. Galvão
Phys. Rev. A 108, L040202 (2023) - Published 5 October, 2023
The significance of anomalous weak values has been a matter of great debate in quantum foundations and quantum information. Here, a simple proof shows that the weak-value anomaly requires both negativity of a certain quasiprobability representation and coherence of pre- and postselected states in the observable’s basis.
Universal Landauer-like inequality from the first law of thermodynamics
Junjie Liu and Hanlin Nie
Phys. Rev. A 108, L040203 (2023) - Published 13 October, 2023
The authors establish universal Landauer-like inequalities derived from the first law of thermodynamics, offering a robust framework for constraining the energetic costs of quantum processes in diverse environments. The study applies these general inequalities to two illustrative scenarios: a dissipative quantum state preparation setup and a quantum information erasure model.
