Experimental quantum homomorphic encryption

Abstract Quantum computers promise not only to outperform classical machines for certain important tasks, but also preserve privacy of computation. For example, the blind quantum computing protocol enables secure delegated computation, where a client can protect their data and algorithms from server assigned run However, this security comes with practical limitation that must communicate after each step A alternative is homomorphic encryption, which does require any interactions, while providing quantum-enhanced variety computations. In scenario, specifies computation be performed, provides input data, thus enabling noninteractive Here, we demonstrate homomorphic-encrypted unitary transformations individual qubits, as well multi-qubit walk computations using single-photon states non-birefringent integrated optics. The encrypts in photons’ polarization state, performs path degree freedom. Our demonstration photonics underlines applicability computations, shows potential photons.