10,322 research outputs found
Quantum Cloning, Bell's Inequality and Teleportation
We analyze a possibility of using the two qubit output state from
Buzek-Hillery quantum copying machine (not necessarily universal quantum
cloning machine) as a teleportation channel. We show that there is a range of
values of the machine parameter for which the two qubit output state is
entangled and violates Bell-CHSH inequality and for a different range it
remains entangled but does not violate Bell-CHSH inequality. Further we observe
that for certain values of the machine parameter the two-qubit mixed state can
be used as a teleportation channel. The use of the output state from the
Buzek-Hillery cloning machine as a teleportation channel provides an additional
appeal to the cloning machine and motivation of our present work.Comment: 7 pages and no figures, Accepted in Journal of Physics
Vedic partnership rules
The law writers of ancient India (around 700 B.C.) devised, in a period of flourishing trade, rules for the administration of partnerships, formed as a means of combining capital and skills of individual entrepreneurs. These rules are indicative of the concern of the writers with partnership economics and equity--concepts which form an important part of present day partnership law
Emergence of a non-scaling degree distribution in bipartite networks: a numerical and analytical study
We study the growth of bipartite networks in which the number of nodes in one
of the partitions is kept fixed while the other partition is allowed to grow.
We study random and preferential attachment as well as combination of both. We
derive the exact analytical expression for the degree-distribution of all these
different types of attachments while assuming that edges are incorporated
sequentially, i.e., a single edge is added to the growing network in a time
step. We also provide an approximate expression for the case when more than one
edge are added in a time step. We show that depending on the relative weight
between random and preferential attachment, the degree-distribution of this
type of network falls into one of four possible regimes which range from a
binomial distribution for pure random attachment to an u-shaped distribution
for dominant preferential attachment
Optimal processor assignment for pipeline computations
The availability of large scale multitasked parallel architectures introduces the following processor assignment problem for pipelined computations. Given a set of tasks and their precedence constraints, along with their experimentally determined individual responses times for different processor sizes, find an assignment of processor to tasks. Two objectives are of interest: minimal response given a throughput requirement, and maximal throughput given a response time requirement. These assignment problems differ considerably from the classical mapping problem in which several tasks share a processor; instead, it is assumed that a large number of processors are to be assigned to a relatively small number of tasks. Efficient assignment algorithms were developed for different classes of task structures. For a p processor system and a series parallel precedence graph with n constituent tasks, an O(np2) algorithm is provided that finds the optimal assignment for the response time optimization problem; it was found that the assignment optimizing the constrained throughput in O(np2log p) time. Special cases of linear, independent, and tree graphs are also considered
New limits on top squark NLSP from ATLAS 4.7 data
Using the ATLAS 4.7 data on new physics search in the jets + \met
channel, we obtain new limits on the lighter top squark ()
considering all its decay modes assuming that it is the next to lightest
supersymmetric particle (NLSP). If the decay \lstop \ra c \lspone dominates
and the production of dark matter relic density is due to NLSP - LSP
co-annihilation then the lower limit on \mlstop is 240 GeV. The limit
changes to 200 GeV if the decay \lstop \ra b W \lspone dominates. Combining
these results it follows that \lstop NLSP induced baryogenesis is now
constrained more tightly.Comment: 9 pages, 2 figures, published in MPL
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