Abstract
By virtue of the canonical quantization method, the Hamilton operator for the charge qubits coupled by the variable capacitor is given. Based on this system, the realization scheme of the controlled-phase-shift gate is proposed. Meanwhile the quantum entanglement phenomena exiting in the system are discussed. An interesting conclusion is obtained, i.e., if one desires to change the quantum entanglement, the coupling capacitance should be considered first, but it is also a good choice to tune symmetric and asymmetric combination of two external magnetic fluxes respectively through the two loops.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 11147009 and 11244005) and the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2020MA085 and ZR2020MF113).
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Liang, B.L., Wu, M.Y., Wang, J.S. et al. Controlled-Phase-Shift Gate Realization and Quantum Entanglement Control for the Charge Qubits Coupled by Variable Capacitor. Int J Theor Phys 61, 79 (2022). https://doi.org/10.1007/s10773-022-04981-7
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DOI: https://doi.org/10.1007/s10773-022-04981-7