title: Demonstration of blind quantum computing.
abstract: Quantum computers, besides offering substantial computational speedups, are also expected to preserve the privacy of a computation. We present an experimental demonstration of blind quantum computing in which the input, computation, and output all remain unknown to the computer. We exploit the conceptual framework of measurement-based quantum computation that enables a client to delegate a computation to a quantum server. Various blind delegated computations, including one- and two-qubit gates and the Deutsch and Grover quantum algorithms, are demonstrated. The client only needs to be able to prepare and transmit individual photonic qubits. Our demonstration is crucial for unconditionally secure quantum cloud computing and might become a key ingredient for real-life applications, especially when considering the challenges of making powerful quantum computers widely available.
authors.affiliation: Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria. stefanie.barz@univie.ac.at
authors.forename: Stefanie
authors.initials: S
authors.lastname: Barz
authors.forename: Elham
authors.initials: E
authors.lastname: Kashefi
authors.forename: Anne
authors.initials: A
authors.lastname: Broadbent
authors.forename: Joseph F
authors.initials: JF
authors.lastname: Fitzsimons
authors.forename: Anton
authors.initials: A
authors.lastname: Zeilinger
authors.forename: Philip
authors.initials: P
authors.lastname: Walther