Abstract
Techniques for the speedup of the adiabatic evolution by adding a leakage elimination operation (LEO) Hamiltonian to the system in an adiabatic frame have been developed recently. The LEO Hamiltonian can be implemented by a sequence of pulses, and the required pulse conditions for obtaining the effective adiabatic speedup have been analyzed. However, the required pulses obtained in an adiabatic frame have to be transformed into the forms in a laboratory frame since the pulses need to be added in a laboratory frame in an experiment. In this paper, we add an LEO Hamiltonian directly in a laboratory frame and find that the required pulse conditions obtained in the adiabatic frame are no longer valid. By exact numerical calculation, we obtain the new pulse conditions in the laboratory frame. We discuss the adiabatic speedup for different types of pulses using the process of cutting a ring spin chain as an example. The fidelity which measures the adiabaticity is found to be nearly one by carefully designing the pulse period and strength for a predefined time. Our scheme is more feasible to be realized in a practical experiment, since the physical implementation of the pulses is a challenging task after a transformation from an adiabatic frame to a laboratory frame.
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Acknowledgements
This material is based upon work supported by the NSFC (Grants No. 11475160, No. 61575180) and the Natural Science Foundation of Shandong Province (Grants No. ZR2014AM023, No. ZR2014AQ026). Z.M.W. thanks the China Scholarship Council (CSC) No. 201606335034 for this scholarship.
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Wang, R., Ren, FH., Gu, YJ. et al. Adiabatic speedup in cutting a spin chain by pulse control in a laboratory frame. Quantum Inf Process 19, 280 (2020). https://doi.org/10.1007/s11128-020-02779-2
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DOI: https://doi.org/10.1007/s11128-020-02779-2