摘要
Unambiguous quantum state filtering is applied to evaluation of the decoherence sensing of entangled quantum channels consisting of N-mode entangled coherent states. It is found that quantum entanglement can enhance the performance of decoherence sensing while the increase of the mode numbers in the entangled probe field can slightly improve the sensing performance only in the weak field regime.
Unambiguous quantum state filtering is applied to evaluation of the decoherence sensing of entangled quantum channels consisting of N-mode entangled coherent states. It is found that quantum entanglement can enhance the performance of decoherence sensing while the increase of the mode numbers in the entangled probe field can slightly improve the sensing performance only in the weak field regime.
基金
Supported by the National Fundamental Research Programme of China under Grant No 2001CB309310, the National Natural Science Foundation of China under Grant Nos 90203018 and 10325523, the Foundation of the Ministry of Education of China, the Educational Committee of Hunan Province （200248 and 02A026）, and the Natural Science Foundation of Hunan Province （05JJ30012）.
