위상 감쇄 채널에서의 약한 측정 및 보정회전 기반 양자 고밀도 전송 프레임웍

Abstract

Quantum dense coding is one of the important quantum computing techniques in communication. Quantum dense coding uses a small number of qubits for transmitions using the quantum entanglement state, which can deliver more classical bit data. However, during a transmission process, the coherence and quantum entanglement state may collapse owing to the influence of the embedding noise channel that a common quantum computing system has. This issue results in a decrease in the transmission capacity of quantum dense coding. Several techniques have been studied to reduce the influences of quantum noise channels. However, these research studies assumed limited quantum environment. This study proposes a new and effective framework to prevent the collapse of quantum entanglement states, focusing on a time-correlated phase damping channels. The quantum state is analyzed using quantum weak measurement (WM), and a correction rotation (CR) technique is integrated to restore it to its initial phase. The effectiveness of the proposed framework is demonstrated experimentally with the comparisons with existing quantum noise reduction techniques.