Physics – Quantum Physics
Scientific paper
2011-11-07
Physics
Quantum Physics
Scientific paper
Quantum decoherence is one of the main obstacles for realizing large-scale quantum information processing. Spontaneous photon scattering is a notable example of such environment induced error and is a fundamental limit to the fidelity of quantum operations. In the scattering process the qubit loses its distinctive and coherent character owing to the entanglement of the qubit with the photon. However, by utilizing the information carried by the photon we are able to coherently reverse this process and correct for the scattering error. Using a single trapped ion, we implement this quantum correction protocol in real-time with a fidelity greater than 85%. We further use quantum process tomography to characterize spontaneous scattering errors and their correction protocol. The error mechanism investigated here, will enable future quantum error-correction, that requires less knowledge on the scattered photon, thus negating a fundamental limit to quantum operations on atomic superpositions
Akerman Nitzan
Glickman Yinnon
Kotler Shlomi
Ozeri Roee
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