Results 1 to 10 of about 4,152 (114)

Optimal Unambiguous Discrimination of Quantum States [PDF]

open access: yes, 2007
Unambiguously distinguishing between nonorthogonal but linearly independent quantum states is a challenging problem in quantum information processing.
Amiri, A. R.   +3 more
core   +1 more source

Quantum Discord for Generalized Bloch Sphere States [PDF]

open access: yes, 2013
In this study for particular states of bipartite quantum system in 2n?2m dimensional Hilbert space state, similar to m or n-qubit density matrices represented in Bloch sphere we call them generalized Bloch sphere states(GBSS), we give an efficient ...
Jafarizadeh, M. A.   +2 more
core   +1 more source

Relativity, anomalies and objectivity loophole in recent tests of local realism

open access: yesOpen Physics, 2017
Local realism is in conflict with special quantum Bell-type models. Recently, several experiments have demonstrated violation of local realism if we trust their setup assuming special relativity valid.
Bednorz Adam
doaj   +1 more source

Quantum State Smoothing [PDF]

open access: yes, 2015
Smoothing is an estimation method whereby a classical state (probability distribution for classical variables) at a given time is conditioned on all-time (both past and future) observations.
Guevara, Ivonne, Wiseman, Howard
core   +2 more sources

Quantum jumps are more quantum than quantum diffusion

open access: yesNew Journal of Physics, 2014
It was recently argued (Wiseman and Gambetta 2012 Phys. Rev. Lett. http://dx.doi.org/10.1103/PhysRevLett.108.220402 108 http://dx.doi.org/10.1103/PhysRevLett.108.220402 ) that the stochastic dynamics (jumps or diffusion) of an open quantum system are not
Shakib Daryanoosh, Howard M Wiseman
doaj   +1 more source

Comment on "Evidence for Quantized Displacement in Macroscopic Nanomechanical Oscillators" [PDF]

open access: yes, 2005
In a recent Letter, Gaidarzhy et al. [1] claim to have observed evidence for "quantized displacements" of a high-order mode of a nanomechanical oscillator.
A. Cleland   +7 more
core   +2 more sources

Sequential measurements of non-commuting observables with quantum controlled interactions

open access: yesNew Journal of Physics, 2014
The origin of non-classical correlations is difficult to identify since the uncertainty principle requires that information obtained about one observable invariably results in the disturbance of any other non-commuting observable.
Holger F Hofmann
doaj   +1 more source

Why the quantitative condition fails to reveal quantum adiabaticity

open access: yesNew Journal of Physics, 2014
The quantitative adiabatic condition (QAC), or quantitative condition, is a convenient ( a priori ) tool for estimating the adiabaticity of quantum evolutions. However, the range of the applicability of QAC is not well understood.
Dafa Li, Man-Hong Yung
doaj   +1 more source

Autonomous quantum to classical transitions and the generalized imaging theorem

open access: yesNew Journal of Physics, 2016
The mechanism of the transition of a dynamical system from quantum to classical mechanics is of continuing interest. Practically it is of importance for the interpretation of multi-particle coincidence measurements performed at macroscopic distances from
John S Briggs, James M Feagin
doaj   +1 more source

A proof of the Kochen–Specker theorem can always be converted to a state-independent noncontextuality inequality

open access: yesNew Journal of Physics, 2015
Quantum contextuality is one of the fundamental notions in quantum mechanics. Proofs of the Kochen–Specker theorem and noncontextuality inequalities are two means for revealing the contextuality phenomenon in quantum mechanics.
Xiao-Dong Yu, Yan-Qing Guo, D M Tong
doaj   +1 more source

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