Optimal remote restoring of quantum states in communication lines via local magnetic field

• URL: http://arxiv.org/abs/2401.09569v1
• Date: Wed, 17 Jan 2024 19:46:39 GMT
• Title: Optimal remote restoring of quantum states in communication lines via local magnetic field
• Authors: E.B. Fel'dman, A.N. Pechen and A.I. Zenchuk
• Abstract summary: We study the remote restoring of a quantum state transferred along a spin chain We develop a remote state-restoring protocol which uses an inhomogeneous magnetic field with step-wise time-dependent Larmor frequencies as the state-control tool.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Optimal state transport across spin chains, which are proposed as quantum wires for information transfer in solid state quantum architectures, is an important topic for quantum technologies. In this work, we study {the remote restoring of a quantum state transferred along a spin chain.} The structural state-restoring technique provides proportionality between the appropriate elements of the density matrices of the initial sender state and receiver state at some time instant. We develop a {remote} state-restoring protocol which uses an inhomogeneous magnetic field with step-wise time-dependent Larmor frequencies as the state-control tool. For simulating the multiparametric Hamiltonian we use two approximating models. First model is based on the Trotter-Suzuki method, while the second model is based on using short pulses of high intensity. In both cases we estimate the accuracy of the approximation and find the optimal restoring parameters (Larmor frequencies) of the protocol which maximize the coefficients in the proportionality for spin chains of various lengths.

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