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- Christopher M. Dawson, Andrew P. Hines, Duncan Mortimer, Henry L. Haselgrove, Michael A. Nielsen, Tobias Osborne
- Quantum Information & Computation
- 2005

- Ashley Montanaro, Tobias Osborne
- ArXiv
- 2009

An XOR function is a function of the form g(x, y) = f (x ⊕ y), for some boolean function f on n bits. We study the quantum and classical communication complexity of XOR functions. In the case of exact protocols, we completely characterise one-way communication complexity for all f. We also show that, when f is monotone, g's quantum and classical… (More)

- Ashley Montanaro, Tobias Osborne
- Chicago J. Theor. Comput. Sci.
- 2010

In this paper we introduce the study of quantum boolean functions, which are unitary operators f whose square is the identity: f 2 = I. We describe several generalisations of well-known results in the theory of boolean functions, including quantum property testing; a quantum version of the Goldreich-Levin algorithm for finding the large Fourier coefficients… (More)

- R Scannell, M Beurskens, +4 authors T H Osborne
- The Review of scientific instruments
- 2011

Deconvolution of Thomson scattering (TS) profiles is required when the gradient length of the electron temperature (T(e)) or density (n(e)) are comparable to the instrument function length (Δ(R)). The most correct method for deconvolution to obtain underlying T(e) and n(e) profiles is by consideration of scattered signals. However, deconvolution at the… (More)

- L Frassinetti, M N A Beurskens, +6 authors M Walsh
- The Review of scientific instruments
- 2012

The instrument function of the high resolution Thomson scattering (HRTS) diagnostic in the Joint European Torus (JET) has been calculated for use in improved pedestal profile analysis. The full width at half maximum (FWHM) of the spatial instrument response is (22 ± 1) mm for the original HRTS system configuration and depends on the particular magnetic… (More)

A stochastic magnetic boundary, produced by an applied edge resonant magnetic perturbation, is used to suppress most large edge-localized modes (ELMs) in high confinement (H-mode) plasmas. The resulting H mode displays rapid, small oscillations with a bursty character modulated by a coherent 130 Hz envelope. The H mode transport barrier and core confinement… (More)

- James William Harrington, John Preskill, +61 authors Frank Reyes
- 2004

- R J Groebner, A W Leonard, +5 authors L W Owen
- 2008

Recent DIII-D pedestal studies provide improved characterization of pedestal scaling for comparison with models. A new pedestal model accurately predicts the maximum achieved pedestal width and height in TYPE-I ELMing discharges over a large range of DIII-D operational space, including ITER demonstration discharges. The model is a combination of the… (More)

- Tobias Osborne
- Quantum Information & Computation
- 2007

In this paper we study the problem of calculating the convex hull of certain affine algebraic varieties. As we explain, the motivation for considering this problem is that certain pure-state measures of quantum entanglement, which we call polynomial entanglement measures, can be represented as affine algebraic varieties. We consider the evaluation of… (More)

- J D Callen, R J Groebner, +6 authors W M Stacey
- 2010

An H-mode Edge Pedestal (HEP) plasma transport Benchmarking Exercise (BE) was undertaken for a single DIII-D pedestal. Transport modeling codes used include 1.5D interpretive (ONETWO, GTEDGE), 1.5D predictive (ASTRA) and 2D ones (SOLPS, UEDGE). The particular DIII-D discharge considered is 98889, which has a typical low density pedestal. Profiles for the… (More)