Results 51 to 60 of about 25,951 (191)

Macroscopic superpositions require tremendous measurement devices [PDF]

Quantum, 2017
We consider fundamental limits on the detectable size of macroscopic quantum superpositions. We argue that a full quantum mechanical treatment of system plus measurement device is required, and that a (classical) reference frame for phase or direction ...
Michalis Skotiniotis, Wolfgang Dür, Pavel Sekatski   +2 more
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Quantum superpositions cannot be epistemic [PDF]

Quantum Studies: Mathematics and Foundations, 2015
Quantum superposition states are behind many of the curious phenomena exhibited by quantum systems, including Bell non-locality, quantum interference, quantum computational speed-up, and the measurement problem. At the same time, many qualitative properties of quantum superpositions can also be observed in classical probability distributions leading to
openaire   +2 more sources

The measurement problem in quantum mechanics

Science & Philosophy, 2019
In this paper, we discuss the importance of measurement in quantum mechanics and the so-called measurement problem. Any quantum system can be described as a linear combination of eigenstates of an operator representing a physical quantity; this means ...
Alessio Giuseppe Ferraioli, Canio Noce
doaj   +1 more source

Quantum resource studied from the perspective of quantum state superposition

, 2015
Quantum resources, such as discord and entanglement, are crucial in quantum information processing. In this paper, quantum resources are studied from the aspect of quantum state superposition.
Guo, Hong, Luo, Bin, Wu, Chengjun, Li, Junhui   +3 more
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Topologically driven no-superposing theorem with a tight error bound [PDF]

Quantum
To better understand quantum computation we can search for its limits or no-gos, especially if analogous limits do not appear in classical computation.
Zuzana Gavorová
doaj   +1 more source

Arbitrary coherent distributions in a programmable quantum walk

Physical Review Research, 2022
The coherent superposition of position states in a quantum walk (QW) can be precisely engineered towards the desired distributions to meet the need of quantum information applications.
Rong Zhang, Ran Yang, Jian Guo, Chang-Wei Sun, Yi-Chen Liu, Heng Zhou, Ping Xu, Zhenda Xie, Yan-Xiao Gong, Shi-Ning Zhu   +9 more
doaj   +1 more source

Quantum entanglement without superposition

, 2022
Superposition states are at the origin of many paradoxes in quantum mechanics. By unraveling the von Neumann equation for density matrices, we develop a superposition-free formulation of quantum mechanics.
Öttinger, Hans Christian
core  

Comment on 'A scattering quantum circuit for measuring Bell's time inequality:a nuclear magnetic resonance demonstration using maximally mixed states'

, 2012
A recent paper by Souza, Oliveira and Sarthour (SOS) reports the experimental violation of a Leggett-Garg (LG) inequality (sometimes referred to as a temporal Bell inequality).
Benjamin, SC, Briggs, G. A. D., Gauger, E.M., Benjamin, S. C., Gauger, E. M.; id_orcid, Benjamin, Simon, Benjamin, S.C., Knee, GC, Briggs, GAD, Briggs, George, Briggs, G.A.D., Knee, G.C., Gauger, EM, Knee, G. C.   +13 more
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Quantum nature of black hole and the superposition of fermionic field

European Physical Journal C: Particles and Fields
The operational framework for the superposition of spacetime is fundamentally important in developing a comprehensive description of quantum gravity (Foo et al. in Phys Rev Lett 129:181301, 2022).
Jinshan An, Li Zhang, Lulu Xiao, Jieci Wang   +3 more
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Pentaquark and hybrid states [PDF]

EPJ Web of Conferences, 2019
We resume our results on the heavy quarkonium hybrids [19], and on the recently observed pentaquark states [16–18]. The latter have been investigated in three different scenarios: as compact pentaquark states [20], as a quantum superposition of D(*)Λc, D(
Santopinto Elena
doaj   +1 more source