作者:Akshata Shenoy-Hejamadi , Anirban Pathak , Srikanth Radhakrishna
来源:[J].Quanta, 2017, Vol.6 (1), pp.1-47Quanta
摘要:Uniquely among the sciences, quantum cryptography has driven both foundational research as well as practical real-life applications. We review the progress of quantum cryptography in the last decade, covering quantum key distribution and other applications. Quanta 2017; 6: 1...
作者:Ananya Paul , Tabish Qureshi
来源:[J].Quanta, 2018, Vol.7 (1), pp.1-6Quanta
摘要:A double-slit experiment with entangled photons is theoretically analyzed. It is shown that, under suitable conditions, two entangled photons of wavelength λ can behave like a biphoton of wavelength λ/2. The interference of these biphotons, passing through a double-slit can ...
作者:Fedor Herbut
来源:[J].Quanta, 2018, Vol.7 (1), pp.19-39Quanta
摘要:An elaborated review with proofs of Schmidt canonical decomposition of any bipartite state vector is approached through general subsystem basis expansion. The upgraded forms of Schmidt decomposition in terms of correlation operator and twin observables are presented in detai...
作者:Ammar Daskin
来源:[J].Quanta, 2018, Vol.7 (1), pp.7-18Quanta
摘要:The learning process for multilayered neural networks with many nodes makes heavy demands on computational resources. In some neural network models, the learning formulas, such as the Widrow–Hoff formula, do not change the eigenvectors of the weight matrix while flatting the...
作者:Anthony Sudbery
来源:[J].Quanta, 2018, Vol.7 (1), pp.68-73Quanta
摘要:I outline Bell's vision of the "great enterprise" of science, and his view that conventional teachings about quantum mechanics constituted a betrayal of this enterprise. I describe a proposal of his to put the theory on a more satisfactory footing, and review the subsequent ...
作者:Emily Christine Adlam
来源:[J].Quanta, 2018, Vol.7 (1), pp.40-53Quanta
摘要:It is proposed that certain features of quantum mechanics may be perspectival effects, which arise because experiments performed on locally accessible variables can only uncover a certain subset of the correlations exhibited by an underlying deterministic theory. This hypoth...
作者:Vinayak Jagadish , Francesco Petruccione
来源:[J].Quanta, 2018, Vol.7 (1), pp.54-67Quanta
摘要:Open quantum systems have become an active area of research, owing to its potential applications in many different fields ranging from computation to biology. Here, we review the formalism of dynamical maps used to represent the time evolution of open quantum systems and dis...
作者:Maurice A. de Gosson
来源:[J].Quanta, 2018, Vol.7 (1), pp.74-110Quanta
摘要:We will study rigorously the notion of mixed states and their density matrices. We will also discuss the quantum-mechanical consequences of possible variations of Planck's constant h. This review has been written having in mind two readerships: mathematical physicists and qu...
作者:Fedor Herbut
来源:[J].Quanta, 2019, Vol.8 (1), pp.1-10Quanta
摘要:To uncover the hidden complete-lattice structure of Hilbert-space projectors, which is not seen by the operator operations and relations (algebraically), resort is taken to the ranges of projectors (to subspaces—to geometry). Taking the range of a projector is completed into...
作者:Tabish Qureshi
来源:[J].Quanta, 2019, Vol.8 (1), pp.24-35Quanta
摘要:The interference observed for a quanton, traversing more than one path, is believed to characterize its wave nature. Conventionally, the sharpness of interference has been quantified by its visibility or contrast, as defined in optics. Based on this visibility, wave-particle...


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