369 research outputs found
Multipartite entanglement percolation
We present percolation strategies based on multipartite measurements to
propagate entanglement in quantum networks. We consider networks spanned on
regular lattices whose bonds correspond to pure but non-maximally entangled
pairs of qubits, with any quantum operation allowed at the nodes. Despite
significant effort in the past, improvements over naive (classical) percolation
strategies have been found for only few lattices, often with restrictions on
the initial amount of entanglement in the bonds. In contrast, multipartite
entanglement percolation outperform the classical percolation protocols, as
well as all previously known quantum ones, over the entire range of initial
entanglement and for every lattice that we considered.Comment: revtex4, 4 page
Distribution of entanglement in networks of bi-partite full-rank mixed states
We study quantum entanglement distribution on networks with full-rank
bi-partite mixed states linking qubits on nodes. In particular, we use
entanglement swapping and purification to partially entangle widely separated
nodes. The simplest method consists of performing entanglement swappings along
the shortest chain of links connecting the two nodes. However, we show that
this method may be improved upon by choosing a protocol with a specific
ordering of swappings and purifications. A priori, the design that produces
optimal improvement is not clear. However, we parametrize the choices and find
that the optimal values depend strongly on the desired measure of improvement.
As an initial application, we apply the new improved protocols to the
Erd\"os--R\'enyi network and obtain results including low density limits and an
exact calculation of the average entanglement gained at the critical point.Comment: 15 pages, 19 figures. New version includes improvements suggested in
referee repor
Pricing Exotic Options in a Path Integral Approach
In the framework of Black-Scholes-Merton model of financial derivatives, a
path integral approach to option pricing is presented. A general formula to
price European path dependent options on multidimensional assets is obtained
and implemented by means of various flexible and efficient algorithms. As an
example, we detail the cases of Asian, barrier knock out, reverse cliquet and
basket call options, evaluating prices and Greeks. The numerical results are
compared with those obtained with other procedures used in quantitative finance
and found to be in good agreement. In particular, when pricing at-the-money and
out-of-the-money options, the path integral approach exhibits competitive
performances.Comment: 21 pages, LaTeX, 3 figures, 6 table
Use of the infra hyoid musculo-cutaneous flap in soft palate reconstruction.
To review a series of 23 consecutive patients with squamous cell carcinomas arising from oropharynx who underwent infra hyoid musculo-cutaneous flap reconstruction including soft palate in alternative to free radial forearm flap or maxillofacial prosthesis. Post operative radiotherapy was performed for all patients.Every reconstruction healed quickly without major wound complications. The functional results evaluated by speech and swallowing capacities, were good for 17 patients, fair for 4 patients and bad for 2.The infra hyoid musculo-cutaneous flap is a versatile, reliable and convenient flap suitable for repairing small and medium sized defects; it can be used in combination with other flaps, and in selected cases obviates the need for a microvascular free radial forearm flap or maxillofacial prosthesis
Publisher Correction: Symbiodinium genomes reveal adaptive evolution of functions related to coral-dinoflagellate symbiosis
Interference of a Tonks-Girardeau Gas on a Ring
We study the quantum dynamics of a one-dimensional gas of impenetrable bosons
on a ring, and investigate the interference that results when an initially
trapped gas localized on one side of the ring is released, split via an
optical-dipole grating, and recombined on the other side of the ring. Large
visibility interference fringes arise when the wavevector of the optical dipole
grating is larger than the effective Fermi wavevector of the initial gas.Comment: 7 pages, 3 figure
Quadratic optimal functional quantization of stochastic processes and numerical applications
In this paper, we present an overview of the recent developments of
functional quantization of stochastic processes, with an emphasis on the
quadratic case. Functional quantization is a way to approximate a process,
viewed as a Hilbert-valued random variable, using a nearest neighbour
projection on a finite codebook. A special emphasis is made on the
computational aspects and the numerical applications, in particular the pricing
of some path-dependent European options.Comment: 41 page
Symbiodinium genomes reveal adaptive evolution of functions related to coral-dinoflagellate symbiosis
Symbiosis between dinoflagellates of the genus Symbiodinium and reef-building corals forms the trophic foundation of the world’s coral reef ecosystems. Here we present the first draft genome of Symbiodinium goreaui (Clade C, type C1: 1.03 Gbp), one of the most ubiquitous endosymbionts associated with corals, and an improved draft genome of Symbiodinium kawagutii (Clade F, strain CS-156: 1.05 Gbp) to further elucidate genomic signatures of this symbiosis. Comparative analysis of four available Symbiodinium genomes against other dinoflagellate genomes led to the identification of 2460 nuclear gene families (containing 5% of Symbiodinium genes) that show evidence of positive selection, including genes involved in photosynthesis, transmembrane ion transport, synthesis and modification of amino acids and glycoproteins, and stress response. Further, we identify extensive sets of genes for meiosis and response to light stress. These draft genomes provide a foundational resource for advancing our understanding of Symbiodinium biology and the coral-algal symbiosis.H.L.
was supported by an Australian Research Council grant (DP150101875) awarded to M.A.
R. and C.X.C. T.G.S. is supported by an Australian Government Research Training
Program Scholarship. R.A.G.-P. is supported by an International Postgraduate Research
Scholarship and a University of Queensland Centenary Scholarship. This project was
supported by the computational resources of the Australian National Computational
Infrastructure (NCI) National Facility systems through the NCI Merit Allocation Scheme
(Project d85) awarded to M.A.R. and C.X.C. The data used in this project were funded by
the Great Barrier Reef Foundation’s Resilient Coral Reefs Successfully Adapting to Climate Change research and development program in collaboration with the Australian
Government, Bioplatforms Australia through the National Collaborative Research
Infrastructure Strategy (NCRIS), Rio Tinto and a family foundation. The authors also
acknowledge the work done by the Reef Future Genomics (ReFuGe) 2020 Consortium.
Access to data generated by the consortium can be accessed via reefgenomics.org. In
memory of S.F., our friend and colleague who is sorely missed
A buccal mucosa carcinoma treated with high dose rate brachytherapy
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/135251/1/acm20008.pd
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