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Quantum coherence is the basic concept of superposition of quantum states andplays an important role in quantum metrology. We show how a pair of uniformlyaccelerated observers with a local two-mode Gaussian quantum state affects theGaussian quantum coherence. We find that the quantum coherence decreases withincreasing acceleration, which is due to the Unruh effect that destroys thequantum resource. Essentially, the variation of quantum coherence is caused bythe modes mismatch between the input and output mode. Through 2000 randomlygenerated states, we demonstrate that such mismatch is dominated by theacceleration effect and mildly affected by the waveform parameters. Moreover,the squeezing parameter acted as a suppressor of the reduced coherence, but ittended to be invalid in the high squeezing. In addition, the squeezingparameter can act as a suppressor of the reduced coherence, but the effect ofthe squeezing parameter tends to be ineffective under high squeezingconditions.

Modes mismatch induced variation of quantum coherence for two-mode localized Gaussian states in accelerated frame