Abstract:
We discuss an adiabatic approximation for the evolution generated by an A-uniformly pseudo-Hermitian Hamiltonian H(t). Such a Hamiltonian is a time-dependent operator H(t) similar to a time-dependent Hermitian Hamiltonian G(t) under a time-independent invertible operator A. Using the relation between the solutions of the evolution equations H(t) and G(t), we prove that H(t) and H†(t) have the same real eigenvalues and the corresponding eigenvectors form two biorthogonal Riesz bases for the state space. For the adiabatic approximate solution in case of the minimum eigenvalue and the ground state of the operator H(t), we prove that this solution coincides with the system state at every instant if and only if the ground eigenvector is time-independent. We also find two upper bounds for the adiabatic approximation error in terms of the norm distance and in terms of the generalized fidelity. We illustrate the obtained results with several examples.
Fundamental Research Funds for the Central Universities of China
GK201703093
This work was supported by the NNSF of
China (Grant Nos. 11601300, 11571213, 11471200, 11401359, and
11371012) and the FRF for the Central Universities (Grant
No. GK201703093).
This publication is cited in the following 1 articles:
W H. Wang, Z. L. Chen, Y. Song, Y. J. Fan, “Optimal Evolution Time Generated by Pseudo-Hermitian Hamiltonian”, Theoret. and Math. Phys., 204:2 (2020), 1020–1032