Adding control to arbitrary unknown quantum operations

Details Adding control to arbitrary unknown quantum operations Adding control to arbitrary unknown quantum operations

2010-06-14

arxiv.org/abs/1006.2670v2

Nature Communications 2:413 (2011)

Physics

Quantum Physics

9 pages, 8 figures

Scientific paper

10.1038/ncomms1392

While 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 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. We demonstrate an entanglement-based version in a photonic system, realizing a range of different two-qubit gates with high fidelity.

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