The randomness cost of a universal quantum masker is at least a measure of information unevenness between its two outputs, and the geometric 'disk' conjecture on maskable states is false.
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Randomness cost of masking quantum information and the information conservation law
The randomness cost of a universal quantum masker is at least a measure of information unevenness between its two outputs, and the geometric 'disk' conjecture on maskable states is false.