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In this study, I argue that the future is not open if quantum mechanics iscomplete. An open future means that the value observed when measuring aphysical quantity in the future is not determined. At first glance, quantummechanics seems to support the open future thesis, because it cannot alwayspredict measurement value with certainty. However, many interpretations regardquantum mechanics as deterministic. These interpretations only suggest that thequantum mechanical world can be deterministic. I argue that, although quantummechanics cannot predict the future with certainty, the quantum mechanicalworld must be deterministic, and the value observed by the observer isdetermined. I examine the following two cases: (1) the wave-function completelydescribes the physical state and (2) the wave-function does not describe thephysical state. Then, I argue that the future cannot be open in either casewhen quantum mechanics is complete.

Why the Future Cannot be Open in the Quantum World