Iranian Journal of Physics Research

Non-local order parameter for topological phase transition in the quantum toric code

Document Type : Original Article

Author

M H Zarei

Department of Physics, School of Science, Shiraz University, Shiraz, Iran

https://doi.org/10.47176/ijpr.20.2.38251
Abstract
It has been known that by encoding the  Boltzmann weights of a classical Ising model in the amplitudes of the wave function of the ground state of the toric code model, the classical phase transition in Ising model is mapped to a topological phase transition in a perturbed toric code model. Since such topological phase transitions cannot be characterized by any local order parameter, it will be an important challenge to find an order parameter which describes the above topological phase transition. In this paper, using a simple technic based on mapping between classical Ising model and the ground state of the toric code model, we find a non-local order parameter which well reveals the topological nature of the above phase transition. We show that such an order parameter is, in fact, a kind of string order parameter which has been recently introduced for some topological phase transitions.

Keywords

topological phase transition
quantum toric code
non-local order parameter
Ising model
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