Shylla Dangka, Nyakang'o Elijah Ogaro, Pandey Kanhaiya
Department of Physics, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India.
Sci Rep. 2018 Jun 6;8(1):8692. doi: 10.1038/s41598-018-27011-1.
We theoretically study a scheme to develop an atomic based micro-wave (MW) interferometry using the Rydberg states in Rb. Unlike the traditional MW interferometry, this scheme is not based upon the electrical circuits, hence the sensitivity of the phase and the amplitude/strength of the MW field is not limited by the Nyquist thermal noise. Further, this system has great advantage due to its much higher frequency range in comparision to the electrical circuit, ranging from radio frequency (RF), MW to terahertz regime. In addition, this is two orders of magnitude more sensitive to field strength as compared to the prior demonstrations on the MW electrometry using the Rydberg atomic states. Further, previously studied atomic systems are only sensitive to the field strength but not to the phase and hence this scheme provides a great opportunity to characterize the MW completely including the propagation direction and the wavefront. The atomic based MW interferometry is based upon a six-level loopy ladder system involving the Rydberg states in which two sub-systems interfere constructively or destructively depending upon the phase between the MW electric fields closing the loop. This work opens up a new field i.e. atomic based MW interferometry replacing the conventional electrical circuit in much superior fashion.
我们从理论上研究了一种利用铷中的里德堡态开发基于原子的微波（MW）干涉测量法的方案。与传统的MW干涉测量法不同，该方案不是基于电路，因此相位灵敏度以及MW场的幅度/强度不受奈奎斯特热噪声的限制。此外，由于该系统与电路相比具有更高的频率范围，从射频（RF）、MW到太赫兹波段，所以具有很大优势。另外，与先前使用里德堡原子态进行MW静电测量的演示相比，该系统对场强的灵敏度要高两个数量级。此外，之前研究的原子系统仅对场强敏感，而对相位不敏感，因此该方案为全面表征MW（包括传播方向和波前）提供了一个绝佳机会。基于原子的MW干涉测量法基于一个涉及里德堡态的六级环形阶梯系统，其中两个子系统根据闭合环路的MW电场之间的相位进行相长干涉或相消干涉。这项工作开辟了一个新领域，即基于原子的MW干涉测量法，它以更优越的方式取代了传统电路。
