Fidelity susceptibility of the quantum Ising model in the transverse field: The exact solution

Abstract

We derive an exact closed-form expression for fidelity susceptibility of the quantum Ising model in the transverse field. We also establish an exact one-to-one correspondence between fidelity susceptibility in the ferromagnetic and paramagnetic phases of this model. Elegant summation formulas are obtained as a by-product of these studies.

7 pages, 3 figures, minor changes, some references added

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