Banerjee, Shreya

The experimental verification of multipartite entangled states is essential for advancing quantum information processing. Entanglement witnesses (EWs) provide a widely used and experimentally accessible approach for detecting genuinely multipartite entangled states. In this work, we theoretically derive the entanglement witness for the four-qubit Dicke state and experimentally evaluate it on two distinct IBM 127-qubit Quantum Processing Units (QPUs), namely ibm_sherbrooke and ibm_brisbane. A negative expectation value of the witness operator serves as a sufficient condition for confirming genuine multipartite entanglement. We report the maximum (negative) values of the witness achieved on these QPUs as and, corresponding to two different state preparation protocols. Additionally, we theoretically investigate the effect of various noise channels on the genuine entanglement of a four-qubit Dicke state using the Qiskit Aer simulator. We show the behavior of the EW constructed under the assumption of Markovian and non-Markovian amplitude damping and depolarizing noises, bit-phase flip noise, and readout errors. We also investigate the effect of varying thermal relaxation time on the EW, depicting a bound on the time required for successful generation of a Dicke State on a superconducting QPU. © 2025 Elsevier B.V., All rights reserved.

Biometeorology research continues to grow and accelerate in terms of productivity (papers produced, studies conducted, etc.) as well as its direct impact on society and policy. Simultaneously, the scientific community is increasingly acknowledging that research has predominantly focused on the Global North. Additionally, work conducted in the Global South often follows extractive practices that primarily advance the careers and scientific knowledge of researchers from the Global North, offering minimal benefit to the communities studied in the Global South. This short communication intends to serve as a call to the biometeorology community to work collaboratively across continents to understand the current knowledge of biometeorology research in the Global South in addition to identifying the gaps, challenges, and opportunities of conducting grounded research in the Global South led by Global South researchers to support societies equitably. © 2025 Elsevier B.V., All rights reserved.