Demonstration of Blind Quantum Computing

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 conce...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2012-01, Vol.335 (6066), p.303-308
Main Authors: Barz, Stefanie, Kashefi, Elham, Broadbent, Anne, Fitzsimons, Joseph F., Zeilinger, Anton, Walther, Philip
Format: Article
Language:English
Subjects:
Algorithms
Blindness
Blinds
Classical and quantum physics: mechanics and fields
Computation
Computer science
Computers
Density
Educational research
Exact sciences and technology
Network servers
Oracles
Photonics
Photons
Physics
Preserves
Quantum computation
Quantum computers
Quantum computing
Quantum information
Quantum physics
Qubits (quantum computing)
RESEARCH ARTICLE
Research grants
Servers
Staircases
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Summary: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1214707