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: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: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: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: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: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:Mani L. Bhaumik
来源:[J].Quanta, 2017, Vol.6 (1), pp.70-80Quanta
摘要:Erwin Schrödinger is famous for presenting his wave equation of motion that jump-started quantum mechanics. His disenchantment with the Copenhagen interpretation of quantum mechanics led him to unveil the Schrödinger's cat paradox, which did not get much attention for nearly...
作者:Tabish Qureshi , Ushba Rizwan
来源:[J].Quanta, 2017, Vol.6 (1), pp.61-69Quanta
摘要:The Hanbury Brown–Twiss (HBT) effect, at the quantum level, is essentially an interference of one particle with another, as opposed to interference of a particle with itself. Conventional treatments of identical particles encounter difficulties while dealing with entanglemen...
作者:Radu Ionicioiu
来源:[J].Quanta, 2017, Vol.6 (1), pp.57-60Quanta
摘要:Schrödinger's cat is one of the most striking paradoxes of quantum mechanics that reveals the counterintuitive aspects of the microscopic world. Here, I discuss the paradox in the framework of quantum information. Using a quantum networks formalism, I analyse the information...


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