A portable atomic clock is a high-precision time measurement device, which is widely used in fields such as the military, scientific research, and communications. Due to its extremely high time stability and accuracy, the portable atomic clock is indispensable in scenarios that require precise time synchronization. In recent years, with the progress of microelectronics technology and quantum physics, the volume of portable atomic clocks has been continuously shrinking, their performance has been continuously improving, and their costs have gradually decreased, enabling them to be applied in more fields.

In the future, the development of portable atomic clocks will focus more on the improvement of performance and the expansion of the application range. In terms of performance, by adopting more advanced quantum technologies and materials science, the time precision and stability of portable atomic clocks will be further enhanced. In terms of the application range, in addition to the traditional military and scientific research fields, portable atomic clocks are also expected to play a greater role in fields with extremely high requirements for time synchronization, such as financial transactions, aerospace, and power grid dispatching. Moreover, with the popularization of the Internet of Things and smart devices, the miniaturization and integration of portable atomic clocks will also become an important development direction in the future.