Non-uniform magnetic field as a booster for quantum speed limit: faster quantum information processing

• URL: http://arxiv.org/abs/2112.04519v2
• Date: Tue, 23 Aug 2022 20:23:29 GMT
• Title: Non-uniform magnetic field as a booster for quantum speed limit: faster quantum information processing
• Authors: Srishty Aggarwal (IISc), Subhashish Banerjee (IITJ), Arindam Ghosh (IISc), Banibrata Mukhopadhyay (IISc)
• Abstract summary: We show that the quantum speed limit increases to a large value, but within the regime of causality, by choosing a proper variation in magnetic fields. We use the Bremermann--Bekenstein bound to find a critical magnetic field that bridges the gap between non-relativistic and relativistic treatments.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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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