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Non-uniform magnetic field as a booster for quantum speed limit: faster quantum information processing
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We probe the quantum speed limit (QSL) of an electron when it is trapped in a non-uniform magnetic field. We show that the QSL increases to a large value, but within the regime of causality, by choosing a proper variation in magnetic fields. We also probe the dependence of QSL on spin of electron and find that it is higher for spin-down electron in the relativistic regime. This can be useful in achieving a faster speed of transmission of quantum information. Further, we use the Bremermann--Bekenstein bound to find a critical magnetic field that bridges the gap between non-relativistic and relativistic treatments and relates to the stability of matter. An analytical framework is developed. We also provide a plausible experimental design to supplement our theory.
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Probing the quantum speed limit and entanglement in flavor oscillations of neutrino-antineutrino system in curved spacetime
Gravity-induced neutrino-antineutrino oscillations near a rotating primordial black hole are computed in Kerr-Schild polar coordinates, with quantum speed limit and entanglement entropy estimated.
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