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:Mani L. Bhaumik
来源:[J].Quanta, 2016, Vol.5 (1), pp.93-100Quanta
摘要:A satisfactory explanation of the confounding wave-particle duality of matter is presented in terms of the reality of the wave nature of a particle. In this view, a quantum particle is an objectively real wave packet consisting of irregular disturbances of underlying quantum...
作者:Peter J. Lewis
来源:[J].Quanta, 2016, Vol.5 (1), pp.85-92Quanta
摘要:Quantum mechanics is often taken to entail holism. I examine the arguments for this claim, and find that although there is no general argument from the structure of quantum mechanics to holism, there are specific arguments for holism available within the three main realist i...
作者:Chariton Aris Chatzidimitriou-Dreismann
来源:[J].Quanta, 2016, Vol.5 (1), pp.61-84Quanta
摘要:The notions of weak measurement, weak value, and two-state-vector formalism provide a new quantum-theoretical frame for extracting additional information from a system in the limit of small disturbances to its state. Here, we provide an application to the case of two-body sc...
作者:Yakir Aharonov , Eliahu Cohen , Tomer Shushi
来源:[J].Quanta, 2016, Vol.5 (1), pp.53-60Quanta
摘要:Retrocausal models of quantum mechanics add further weight to the conflict between causality and the possible existence of free will. We analyze a simple closed causal loop ensuing from the interaction between two systems with opposing thermodynamic time arrows, such that ea...
作者:Ovidiu Cristinel Stoica
来源:[J].Quanta, 2016, Vol.5 (1), pp.19-33Quanta
摘要:Wavefunction collapse is usually seen as a discontinuous violation of the unitary evolution of a quantum system, caused by the observation. Moreover, the collapse appears to be nonlocal in a sense which seems at odds with general relativity. In this article the possibility t...
作者:Giuseppe Castagnoli
来源:[J].Quanta, 2016, Vol.5 (1), pp.34-52Quanta
摘要:We investigate the reason for the quantum speedup (quantum algorithms require fewer computation steps than their classical counterparts). We extend the representation of the quantum algorithm to the process of setting the problem, namely choosing the function computed by the...
作者:Ken Wharton
来源:[J].Quanta, 2016, Vol.5 (1), pp.1-11Quanta
摘要:The Feynman path integral does not allow a one real path interpretation, because the quantum amplitudes contribute to probabilities in a non-separable manner. The opposite extreme, all paths happen , is not a useful or informative account. In this paper it is shown that an i...
作者:Ruth E. Kastner
来源:[J].Quanta, 2016, Vol.5 (1), pp.12-18Quanta
摘要:One of Feynman's greatest contributions to physics was the interpretation of negative energies as antimatter in quantum field theory. A key component of this interpretation is the Feynman propagator, which seeks to describe the behavior of antimatter at the virtual particle ...
作者:Mani L. Bhaumik
来源:[J].Quanta, 2015, Vol.4 (1), pp.35-42Quanta
摘要:Albert Einstein is considered by many physicists as the father of quantum physics in some sense. Yet there is an unshakable view that he was wrong on quantum physics. Although it may be a subject of considerable debate, the core of his allegedly wrong demurral was the insist...


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