Adding control to arbitrary unknown quantum operations

X-Q Zhou, Timothy C. Ralph, P Kalasuwan, Zhang Mian, A Peruzzo, Benjamin P. Lanyon, JL O'Brien

Research output: Contribution to journalArticle (Academic Journal)peer-review

71 Citations (Scopus)


Although quantum computers promise significant advantages, the complexity of quantum algorithms remains a major technological obstacle. We have developed and demonstrated an architecture-independent technique that simplifies adding control qubits to arbitrary quantum operations—a requirement in many quantum algorithms, simulations and metrology. The technique, which is independent of how the operation is done, does not require knowledge of what the operation is, and largely separates the problems of how to implement a quantum operation in the laboratory and how to add a control. Here, we demonstrate an entanglement-based version in a photonic system, realizing a range of different two-qubit gates with high fidelity.
Translated title of the contributionAdding control to arbitrary unknown quantum operations
Original languageEnglish
Article number413
Number of pages8
JournalNature Communications
Publication statusPublished - 2 Aug 2011

Bibliographical note

Author of Publication Reviewed: X-Q Zhou, TC Ralph, P Kalasuwan, M Zhang, A Peruzzo, BP Lanyon, and JL OBrien

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