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Demonstration of Blind Quantum Computing

Research output: Contribution to journalArticle

  • Stefanie Barz
  • Elham Kashefi
  • Anne Broadbent
  • Joseph F. Fitzsimons
  • Anton Zeilinger
  • Philip Walther

Related Edinburgh Organisations

Original languageEnglish
Pages (from-to)303-308
Number of pages6
Issue number6066
Publication statusPublished - 2012


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.

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