外加经典驱动场保护非马尔科夫信道量子失协的对策

Strategy for Protecting Quantum Discord in Non-Markov Channel by External Classical Field

讨论了外加经典驱动场对非马尔科夫信道量子失协动力学演化的影响.研究结果表明:尽管调控经典场的幅度、频率均能够对非马尔科夫信道量子失协起保护作用,但保护的效果有较大差别;能对系统量子失协保持起关键作用的是量子比特的有效频率与热库中心频率间的总失谐,调控经典驱动场的幅度是增大总失谐的最有效的途径.提升经典驱动场的幅度是实现量子失协保持最有效的方法.

The effect of external classical field on the quantum discord in non-markov channel has been discussed.In spite of manipulating the amplitude and frequency of the external field help to protect the quantum discord in non-markov channel,the efficiency is quite different. The total detuning between the efficient frequency of qubit and the central frequency of thermal bath plays a vital role in maintaining the quantum discord,and the most efficient way to enhance the total detuning is to manipulate the amplitude of the classical field. Therefore,increasing the amplitude of classical field is the most efficient method for quantum discord maintaining.