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Quantum Non-demolition Measurements on Qubits
T. C. Ralph, S. D. Bartlett, J. L. O'Brien +2
We discuss the characterization and properties of quantum non-demolition (QND) measurements on qubit systems. We introduce figures of merit which can be applied to systems of any H…
Quantum weak values
G. J. Pryde, J. L. O'Brien, A. G. White +2
We experimentally determine weak values for a single photon's polarization, obtained via a weak measurement that employs a two-photon entangling operation, and postselection. The w…
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…