The vacuum induced Berry phase beyond rotating-wave approximation
Tao Liu, Mang Feng, K. L. Wang
TL;DR
This paper investigates the vacuum induced Berry phase (VIBP) beyond the rotating-wave approximation, revealing new insights into its definition and the importance of RWA in quantum geometric phenomena relevant to quantum information.
Contribution
It introduces a fully quantum mechanical treatment of VIBP beyond RWA, providing a new definition and highlighting the RWA's role in geometric properties of quantum states.
Findings
VIBP differs when analyzed beyond RWA.
RWA's validity affects geometric phase properties.
Results are relevant for quantum information processing.
Abstract
With reference to the vacuum induced Berry phase (VIBP) obtained in the interaction of a spin-1/2 particle with quantized irradiation field under rotating-wave approximation (RWA), we present completely different treatment for the VIBP by a fully quantum mechanical treatment beyond the RWA, which gives a new definition of the VIBP and indicates the validity of RWA to be relevant not only to the energy conservation and comparison of characteristic parameters, but also to more subtle physics, such as the geometric property of the state evolution. Our result is of conceptual importance and also of significant relevance to quantum information processing.
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