Abstract
We investigate how to protect the quantum coherence and quantum Fisher information for two superconducting flux qubits each locally interacting with its own finite-temperature environment (heat bath) with 1/f spectral density by making use of bang-bang pulses. It is shown that the quantum coherence and quantum Fisher information can be improved by applying a train of bang-bang pulses and protected more effectively with shorter interval pulses. In addition, we also explore the influence of bang-bang pulses on the transfer of quantum information between two flux qubits and heat baths by a witness of trace distance. It is found that the bang-bang pulses can suppress the effect of heat baths and slow down the exchange of the quantum information flows between two flux qubits and heat baths.
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Acknowledgements
This project was supported by the National Natural Science Foundation of China (Grant No.11364006), the Guizhou Provincial Science and Technology Foundation (Grant No.[2017]7343), the Key laboratory of low dimensional condensed matter physics of higher educational institution of Guizhou province(Grant No.[2016]002).
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Liu, CY., Wu, CY., Xiao, YJ. et al. Dynamical Suppression of Decoherence and Protection of Quantum Coherence Between Superconducting Flux Qubits in 1/f Noise Environments by Bang-Bang Pulses. Int J Theor Phys 61, 9 (2022). https://doi.org/10.1007/s10773-022-05004-1
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DOI: https://doi.org/10.1007/s10773-022-05004-1