Adding control to arbitrary unknown quantum operations

Xiao-Qi Zhou, Timothy C. Ralph, Pruet Kalasuwan, Mian Zhang, Alberto Peruzzo, Benjamin P. Lanyon and Jeremy L. O'Brien ()
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Xiao-Qi Zhou: Centre for Quantum Photonics, University of Bristol, Bristol BS8 1UB, UK.
Timothy C. Ralph: University of Queensland, Brisbane, Queensland 4072, Australia.
Pruet Kalasuwan: Centre for Quantum Photonics, University of Bristol, Bristol BS8 1UB, UK.
Mian Zhang: Centre for Quantum Photonics, University of Bristol, Bristol BS8 1UB, UK.
Alberto Peruzzo: Centre for Quantum Photonics, University of Bristol, Bristol BS8 1UB, UK.
Benjamin P. Lanyon: Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße, Innsbruck 25, 6020, Austria.
Jeremy L. O'Brien: Centre for Quantum Photonics, University of Bristol, Bristol BS8 1UB, UK.

Nature Communications, 2011, vol. 2, issue 1, 1-8

Abstract: Abstract 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.

Date: 2011
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DOI: 10.1038/ncomms1392

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