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Annals of Physics

Optimal control of fast and high-fidelity quantum state transfer in spin-1/2 chains

Xiong-Peng Zhang, Bin Shao, Shuai Hu, Jian Zou, Lian-Ao Wu

Published Oct 27, 2016• 24 citations
Publisher
DOI
10.1016/j.aop.2016.10.020

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We present a couple of counterdiabatic (CD) schemes for a rapid and high-fidelity transfer of quantum state across a one-dimensional spin chain, between two weakly coupled external qubits at each end. Employing the effective low-energy Hamiltonian of the system, we first construct the optimal CD terms based on the variational principle and then put forward two experimentally feasible shortcuts, which only need to manipulate couplings between the external qubits and chain. Compared to traditional adiabatic protocol, the resulting schemes allow a drastic increase in state-transfer fidelity in a short time. Furthermore, numerical simulation demonstrates that our speed-up protocols hold robustness against the imperfections of control fields and evolution time. The proposed schemes may be applicable to fast quantum-information transport in various spin-based physical systems.