Seok Hyung Lie, Hyunseok Jeong. Limitations of teleporting a qubit via a two-mode squeezed state[J]. Photonics Research, 2019, 7(5): A7
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Fig. 3. Transmission fidelity of a photonic qubit with numerically optimized gains. Here, q is the squeezing parameter of the initial two-mode squeezed state; the maximum fidelity curve is numerically obtained and plotted with the thick dashed curve, and that of q=1 is plotted with the thin dotted curve. It is impossible to attain fidelity higher than the classical limit (horizontal dotted line) with loss bigger than about 11%.
Fig. 4. Log negativity of the two-mode squeezed state in terms of the loss rate r2. On the contrary to the fidelity, there is no inversion in order with increasing loss.