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Physique du spin
(2) Production(s) de l'année 2019
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Dynamic spin-charge coupling: ac spin Hall magnetoresistance in nonmagnetic conductors
Auteur(s): Alekseev P. S., Dyakonov M.
(Article) Publié:
Physical Review B, vol. 100 p.081301 (2019)
Texte intégral en Openaccess :
Ref HAL: hal-02302522_v1
DOI: 10.1103/PhysRevB.100.081301
WoS: WOS:000478993500002
Exporter : BibTex | endNote
Résumé: The dynamic coupling between spin and charge currents in nonmagnetic conductors is considered. As a consequence of this coupling, the spin dynamics is directly reflected in the electrical impedance of the sample, with a relevant frequency scale defined by spin relaxation and spin diffusion. This allows the observation of the electron spin resonance by purely electrical measurements.
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When will we have a quantum computer?
Auteur(s): Dyakonov M.
(Article) Publié:
Solid-State Electronics, vol. 155 p.4-6 (2019)
Texte intégral en Openaccess :
Ref HAL: hal-02302517_v1
DOI: 10.1016/j.sse.2019.03.004
WoS: WOS:000466840600002
Exporter : BibTex | endNote
Résumé: - A classical computer with N bits at any given moment is in one of its possible 2N states. - In contrast, the state of the hypothetical quantum computer with N qubits is defined by the values of 2N continuous parameters, the quantum amplitudes. - To beat your laptop in performing some special tasks, like factoring very large numbers, one needs ∼1000 qubits. - Accordingly, the number of continuous variables that should be under our control is at least 21000 ∼ 10300. - Thus the answer to the question in the title is: as soon as physicists and engineers will learn to control thus number of degrees of freedom, which means NEVER.
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