Results 101 to 110 of about 1,709,561 (207)
Quantum discord and one-norm geometric quantum discord for XXX Heisenberg spin chain under noisy channels [PDF]
arXiv, 2014 Here, we compare the behavior of the quantum discord, 1-norm geometric quantum discord and concurrence under the effect of decoherence for XXX Heisenberg spin chain. Their dependencies on temperature and coupling constant are presented in detail. By a comparison between them we can see that quantum discord and 1-norm geometric quantum discord are more ...
arxiv
Satellite‐Derived Productivity Outputs for Land Degradation Assessment Vary With Biome and Rainfall
Land Degradation &Development, EarlyView.ABSTRACT Estimates of the extent of land degradation vary dramatically. To quantify the extent and location of land degradation globally, the United Nations Convention to Combat Desertification (UNCCD) asks member countries to report on land degradation every four years, providing crucial baseline and change data.
Colleen L. Seymour +8 more
wiley +1 more source
Quantum correlations in optomechanical system in the presence of optical feedback
Physics Open, 2022 In this paper, we investigate the dynamics of quantum correlations for the continuous-variable bipartite optomechanical system in the presence of homodyne mediated quantum feedback.
Sitotaw Eshete
doaj
Quantum Discord and Maxwell's Demons [PDF]
arXiv, 2002 Quantum discord was proposed as an information theoretic measure of the ``quantumness'' of correlations. I show that discord determines the difference between the efficiency of quantum and classical Maxwell's demons in extracting work from collections of correlated quantum systems.
arxiv
Correlance and Discordance: Computable Measures of Nonlocal Correlation [PDF]
Quant. Inf. Process. 19, 189 (2020), 2020 We present six new measures of nonlocal correlation for discrete multipartite quantum systems; correlance, statance, probablance, strong discordance, discordance, and diagonal discordance. The correlance measures all nonlocal correlation (even bound entanglement), and is exactly computable for all pure and mixed states. Statance and probablance are not
arxiv
Reflections on the Spatial Exponential Growth of Electromagnetic Quasinormal Modes
Laser &Photonics Reviews, EarlyView.Quasinormal modes (QNMs) offer a robust framework for understanding the physics of resonators. However, conceptual challenges arise in regions distant from resonators, where QNM fields exponentially grow. This growth is not unphysical, but gives rise to counterintuitive effects, which is explained by examining fundamentals of non‐Hermitian systems ...
Tong Wu +2 more
wiley +1 more source
Witnessing the quantum discord of all the unknown states [PDF]
arXiv, 2011 Like entanglement, quantum discord quantifies the quantum correlations. Unlike entanglement, whose detection is extremely difficult, the quantum discord of an arbitrary bipartite state allows itself to be detected perfectly by a single observable, the quantum discord witness. In particular, we report a single observable whose expectation value provides
arxiv
Frozen discord in stochastic dephasing environment [PDF]
arXiv, 2020 Preserving quantum coherence is fundamental challenge in the field of quantum computation. Here, I investigate the frozen discord phenomenon and non-Markovianity for qubits experiencing local dephasing in a classical environment. The quantum discord of a certain initial bipartite state, independently interacting with stochastic Gaussian fields, can be ...
arxiv
Progress in Photovoltaics: Research and Applications, EarlyView.We present a three‐step method to measure the subcell external quantum efficiency (EQE) in a multijunction photovoltaic (PV) device with overlapping subcell absorptance: (1) apply light bias to generate current mismatch, (2) identify individual subcell breakdowns from I–V characteristics measured into reverse bias, and (3) measure subcell EQE curves ...
Meghan N. Beattie +6 more
wiley +1 more source
General bounds for quantum discord and discord distance [PDF]
arXiv, 2014 For any bipartite state, how strongly can one subsystem be quantum correlated with another? Using the Koashi-Winter relation, we study the upper bound of purified quantum discord, which is given by the sum of the von Neumann entropy of the unmeasured subsystem and the entanglement of formation shared between the unmeasured subsystem with the ...
arxiv