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Journals and Conferences
If two separated observers are supplied with entanglement, in the form of n pairs of particles in identical partly-entangled pure states, one member of each pair being given to each observer; they can, by local actions of each observer, concentrate this entanglement into a smaller number of maximally-entangled pairs of particles, for example… (More)
This paper documents the discovery of a new, better-than-classical quantum algorithm for the depthtwo AND/OR tree problem. We describe the genetic programming system that was constructed specifically for this work, the quantum computer simulator that is used to evaluate the fitness of evolving quantum algorithms, and the newly discovered algorithm.
Genetic programming can be used to automatically discover algorithms for quantum computers that are more efficient than any classical computer algorithms for the same problems. In this paper we exhibit the first evolved betterthan-classical quantum algorithm, for Deutsch’s “early promise” problem. We also demonstrate a technique for evolving scalable… (More)
We give the first quantum circuit for computing f (0) OR f (1) more reliably than is classically possible with a single evaluation of the function. OR therefore joins XOR (i.e. parity, f (0)⊕ f (1)) to give the full set of logical connectives (up to relabelling of inputs and outputs) for which there is quantum speedup.
The biosciences need an image format capable of high performance and long-term maintenance. Is HDF5 the answer?
We demonstrate the absence of off-diagonal elements for the density matrix of a supersonic Na atomic beam, thus showing that there are no coherent wave packets emerging from this source. We used a differentially detuned separated oscillatory field longitudinal interferometer to search for off-diagonal density matrix elements in the longitudinal… (More)
A Monte Carlo technique was used to simulate some of the important physical processes involved in the coincidence detection of gamma rays by a positron emission tomograph. The major effect considered here is the detection of Compton scattered gamma rays as coincidence counts. The Compton scattering of gamma rays in a H2O filled phantom was simulated using… (More)
Resonance Raman data have been used to elucidate the mechanisms of the absorption spectral shifts occurring for astaxanthin upon binding to the carotenoproteins, ovoverdin and alpha-,beta- and gamma-crustacyanins, from the lobster Homarus americanus. Although distinguishable on the basis of small differences in their resonance Raman spectra the binding… (More)