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A unified measure of macroscopic quantum superposition

In this study, we use a decoherence-based measure of interference to quantify the effective degree of quantum superposition. We show that a type of measure of the effective degree of quantum superposition can be considered from a unified theoretical framework. We use three decoherence processes to define a corresponding decoherence-based measure of quantum superposition, including amplitude damping, phase damping and quantum Brownian motion. With these definitions, we compare the effective degree of quantum superposition achieved for the different experiments. We also investigate the effective degree of quantum superposition prepared from a mixed state through the reservoir engineering technique.