Obfuscation of Arbitrary Quantum Circuits (via Subspace-Preserving Pseudorandom Unitary)
This work constructs a quantum ideal obfuscation scheme for arbitrary quantum circuits in the classical oracle model using postquantum one-way functions. It solves the challenge of obfuscating general maps by introducing a novel primitive called subspace-preserving strong pseudorandom unitary (spsPRU), which combines structure and randomness to hide the original computation while preserving its functionality.