Quantum Pseudorandomness and Classical Complexity

03/16/2021

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by   William Kretschmer, et al.

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We construct a quantum oracle relative to which 𝖡𝖰𝖯 = 𝖰𝖬𝖠 but cryptographic pseudorandom quantum states and pseudorandom unitary transformations exist, a counterintuitive result in light of the fact that pseudorandom states can be "broken" by quantum Merlin-Arthur adversaries. We explain how this nuance arises as the result of a distinction between algorithms that operate on quantum and classical inputs. On the other hand, we show that some computational complexity assumption is needed to construct pseudorandom states, by proving that pseudorandom states do not exist if 𝖡𝖰𝖯 = 𝖯𝖯. We discuss implications of these results for cryptography, complexity theory, and quantum tomography.