10,463 research outputs found
Innovative organic farming in india
In this article general overview of research progress in the field of organic agriculture in India was given. This include revalidation of traditional organic practices, invent/discover and commercial production technology for organic inputs and research on organic systems. Some of the future directions of organic research in Indian was also discussed
Relative phase change during quantum operation
Quantum operations represented by completely positive maps encompass many of
the physical processes and have been very powerful in describing quantum
computation and information processing tasks. We introduce the notion of
relative phase change for a quantum system undergoing quantum operation. We
find that the relative phase shift of a system not only depends on the state of
the system, but also depends on the initial state of the ancilla with which it
might have interacted in the past. The relative phase change during a sequence
of quantum operations is shown to be non-additive in nature. This property can
attribute a `memory' to a quantum channel. Also the notion of relative phase
shift helps us to define what we call `in-phase quantum channels'. We will
present the relative phase shift for a qubit undergoing depolarizing channel
and complete randomization and discuss their implications.Comment: Latex file, article style, 15 pages, no figures. Invited talk
presented at First Feynman Festival on Quantum Computation at University of
Maryland, College Park from August 23-28th, 2002 under the title ``Quantum
phase during quantum operation'
Replication and Evolution of Quantum Species
We dwell upon the physicist's conception of `life' since Schroedinger and
Wigner through to the modern-day language of living systems in the light of
quantum information. We discuss some basic features of a living system such as
ordinary replication and evolution in terms of quantum bio-information. We also
discuss the principle of no-culling of living replicas. We show that in a
collection of identical species there can be no entanglement between one of the
mutated copies and the rest of the species in a closed universe. Even though
these discussions revolve around `artificial life' they may still be applicable
in real biological systems under suitable conditions.Comment: Latex, 12 pages, no figure
Radiation reaction in the 2.5PN waveform from inspiralling binaries in circular orbits
In this Comment we compute the contributions of the radiation reaction force
in the 2.5 post-Newtonian (PN) gravitational wave polarizations for compact
binaries in circular orbits. (i) We point out and correct an inconsistency in
the derivation of Arun, Blanchet, Iyer, and Qusailah. (ii) We prove that all
contributions from radiation reaction in the 2.5PN waveform are actually
negligible since they can be absorbed into a modification of the orbital phase
at the 5PN order.Comment: 7 pages, no figures, submitted to CQ
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