We have proposed the use of Dual-Parallel Modulator to generate BB84 states to reduce the state preparation flaw due to the pulse fluctuation in the drive signal. We characterized the generated states with state tomography and calculate the density matrix of the states using experiment data. We estimate final key rate with the fidelity derived from calculated density matrices. The final key rate was not affected by the modulation voltage shift up to 20%.
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We have proposed the use of Dual-Parallel Modulator to generate BB84 states to reduce the state preparation flaw due to the pulse fluctuation in the drive signal. We characterized the generated states with state tomography and calculate the density matrix of the states using experiment data. We estimate final key rate with the fidelity derived from calculated density matrices. The final key rate was not affected by the modulation voltage shift up to 20%.