337 citations · 337 across the 1 of their papers we have counts for
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Choice of Measurement Sets in Qubit Tomography
Mark D de Burgh, Nathan K. Langford, Andrew C. Doherty +1
Optimal generalized measurements for state estimation are well understood. However, practical quantum state tomography is typically performed using a fixed set of projective measur…
Experimental demonstration of Shor's algorithm with quantum entanglement
B. P. Lanyon, T. J. Weinhold, N. K. Langford +4
Shor's powerful quantum algorithm for factoring represents a major challenge in quantum computation and its full realization will have a large impact on modern cryptography. Here w…
Entanglement generation by Fock-state filtration
K. J. Resch, J. L. O'Brien, T. J. Weinhold +2
We demonstrate a Fock-state filter which is capable of preferentially blocking single photons over photon pairs. The large conditional nonlinearities are based on higher-order quan…
Generation of Hyperentangled Photons Pairs
Julio T. Barreiro, Nathan K. Langford, Nicholas A. Peters +1
We experimentally demonstrate the first quantum system entangled in every degree of freedom (hyperentangled). Using pairs of photons produced in spontaneous parametric downconversi…
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…