843 citations · 7.9k across the 40 of their papers we have counts for
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Distance measures to compare real and ideal quantum processes
Alexei Gilchrist, Nathan K. Langford, Michael A. Nielsen
With growing success in experimental implementations it is critical to identify a "gold standard" for quantum information processing, a single measure of distance that can be used…
Adaptive phase estimation is more accurate than non-adaptive phase estimation for continuous beams of light
D. T. Pope, H. M. Wiseman, N. K. Langford
We consider the task of estimating the randomly fluctuating phase of a continuous-wave beam of light. Using the theory of quantum parameter estimation, we show that this can be don…
Quantum process tomography of a controlled-NOT gate
J. L. O'Brien, G. J. Pryde, A. Gilchrist +4
We demonstrate complete characterization of a two-qubit entangling process - a linear optics controlled-NOT gate operating with coincident detection - by quantum process tomography…