Enhanced communication enabled by coherent control of channels
摘要
One of the key challenges in building a robust quantum network is the efficient distribution of entanglement and mitigating the detrimental effects of noise, which limit the information transmission rate of quantum channels. In this work, we address these challenges by utilizing the superposition of trajectories and indefinite causal orders. We demonstrate that the effects of amplitude damping can be mitigated using a bit-flip channel, while phase damping can be countered with phase-flip noise. Additionally, depolarizing noise can be suppressed using a bit-phase flip channel. Our results show that at lower noise levels, a coherent superposition of channels is more effective, whereas at higher noise levels, a quantum switch implementing indefinite causal order provides better performance. We compute the quantum capacity of channels in both indefinite causal order and coherent superposition scenarios, revealing that coherent control over quantum channels and indefinite causal order can significantly enhance channel capacity compared to a single application of the channel.