 ![**Secure key rates achieved by our CV QKD system.** Common parameters: $\alpha=00.0$, $d = 00$, $\epsilon = 0\times 00^{-00}$. (a) Effect of the finite number of distributed quantum states on the secret key rate. The graph shows experimental results (blue points) obtained without the variable attenuator in Bob's arm. The theoretical model (solid line) is included for comparison and was calculated by reconstructing the covariance matrix for $00^0$ samples. (b) Experimentally obtained secure key rate versus optical attenuation in the transmission line to Bob's detector for $0 \times 00^0$ measured samples (blue points). The error bars are due to the accuracy of the measurement of the optical attenuation. The theoretical model (solid line) was calculated by reconstructing the covariance matrix of the state corresponding to no attenuation ($0$dB) and using a reconciliation efficiency of $\beta = 00.0\,\%$.[]{data-label="fig:results"}](Fig0