We show that thermal noise could play a positive role in generating one-way Einstein–Podolsky–Rosen (EPR) steering of two cavity fields dispersively interacting with a single four-level atom, each of which is independently coupled to a thermal reservoir. In the low- Q and weak Raman transition regimes, two output fields exhibit asymmetric EPR steering and the steering direction could be easily controlled by adjusting the mean photon numbers of the thermal reservoirs and the decay rates of cavities. Striking features are present in our scheme. First, one-way EPR steering is achieved by using the couplings of the cavities with the heat baths, which sheds light on the quantum state manipulation in the presence of decoherence. Second, the obtainable EPR steering occurs between the cavity fields in the low- Q regime, which relaxes the constraints on the use of good cavities and so makes our scheme more practical. Third, the correlation properties of the output modes are c...

中文翻译：

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通过热噪声相对于低Q腔单向控制光场

我们表明，热噪声在产生与单个四能级原子分散相互作用的两个腔场的单向爱因斯坦-波多尔斯基-罗森（EPR）操纵中可以发挥积极作用。在低Q和弱拉曼跃迁状态下，两个输出场表现出不对称的EPR转向，并且可以通过调节蓄热器的平均光子数和空腔的衰减率来轻松控制转向。引人注目的功能存在于我们的方案中。首先，通过使用型腔与热浴的耦合来实现单向EPR转向，这在存在退相干的情况下为量子态操作提供了新的思路。其次，在低Q态下，可获得的EPR转向发生在腔场之间，这放宽了使用好型腔的限制，因此使我们的方案更加实用。第三，输出模式的相关属性是...