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作者机构:Univ Nacl Cordoba Fac Matemat Astron Fis & Computac CONICET Inst Fis Enrique Gaviola Av Medina Allende S-NCiudad UnivCP X5000HUA Cordoba Argentina Univ Nacl Nordeste Inst Modelado & Innovac Tecnol CONICET UNNE Ave Libertad 5400W3404AAS Corrientes Argentina Univ Nacl Nordeste Fac Ciencias Exactas Nat & Agrimensura Ave Libertad 5400W3404AAS Corrientes Argentina
出 版 物:《PHYSICS LETTERS A》 (Phys Lett Sect A Gen At Solid State Phys)
年 卷 期:2022年第449卷
核心收录:
基 金:CON- ICET [PIP11220150100327, PUE22920170100089CO, PIP11220200- 100170] SECYT-UNC
主 题:Quantum spin chains Global optimization algorithm Almost perfect quantum state transfer Control
摘 要:Spin chains with site dependent exchange coefficients can achieve near perfect quantum state transfer for Hamiltonians with nearest neighbors XXZ type interactions without external control. The strength of the interactions is obtained using a global optimization method, which can be employed without assuming a particular relationship between the arrival time and the strength of the interactions. This relationship arises naturally when data collapse techniques are used to analyze the results of the optimization method. The arrival times achievable are competitive with respect to those obtained by other methods, for chains of moderate length. The stability of the resulting spin chains against static perturbations is also studied. The differences in the dynamical behavior between the isotropic and anisotropic spin chains are analyzed for some particular cases.(C) 2022 Elsevier B.V. All rights reserved.