General quantum phase estimation and calibration of a timepiece in a quantum dot system

We present a physical scheme for implementing quantum phase estimation via weakly coupled double quantum-dot molecules embedded in a microcavity. During the same process of implementation, we can also realize the calibration of a timepiece based on the estimated phase. We use the electron-hole pair states in coupled double quantum-dot molecules to encode quantum information, where the requirement that two quantum dots are exactly identical is not necessary. Our idea can also be generalized to other systems, such as atomic, trapped ion and linear optics system.