358 research outputs found
Contract farming, community development and the politics of production among small-growers in KwaZulu-Natal
African Studies Seminar series. Paper presented 4 March 1996As several scholars and policy institutions have shown, small-scale contract farming has
become increasingly popular in recent years as a model for organising agricultural production at
the margins of the international agro-food economy (Glover and Kusterer 1990; Little and Watts
1994; World Bank 1981). Broadly defined, contract farming refers to "arrangements between a
grower and firm(s) (exporters, processors, retail outlets, or shippers, for example) in which nontransferable contracts specify one or more conditions of marketing and production" (Little and
Watts 1994:4). Proponents of the model note that it underwrites a dynamic partnership
between the processing company and the small-grower farmer, with strong advantages for both
parties. The company takes on the risks of marketing but is able to relinquish to the grower the
risks of production, including the management of a labour force which may be seasonal. The
grower, on the other hand, gains a secure market and access to credit inputs and to the technical
capacity of the company (Glover 1984; Levin 1988). In short, proponents argue, such contracts
can bring wealth, entrepreneurship and employment to rural communities. In that respect,
contract schemes might be regarded as vehicles for modernization.... The idea of a farming contract as a developmental institution is particularly provocative in parts of post-apartheid South Africa where the economic imperatives which press agribusiness companies to seek new opportunities for flexible accumulation are converging dramatically with the political imperatives of democratic transition. In rural KwaZulu-Natal, the first set of
imperatives has invigorated sugar and timber milling companies to promote contract schemes
with farmers occupying old bantustan land under 'traditional' tenure. Through these schemes
the companies gain access to land outside of the freehold sector, and are able to reduce their
labour costs. The companies see the contract operation as a commercial agreement which
generates economic growth, employment and entrepreneurship in rural communities (a'Bear et al
1994). The second set of imperatives prescribes a restructuring of the state to re-link the old
bantustans and their impoverished populations with the central state and the national political
economy. The post-apartheid Government of National Unity (GNU) faces the massive challenge
of increasing both the quality of economic opportunity and the quality of citizenship for rural
people. At a minimum, this requires a new impetus and new institutions for rural development
at the local level. But state-sponsored rural development agencies lack legitimacy and capacity,
especially in the bantustans where apartheid administrative structures are strongly entrenched
(Macintosh 1990; May 1993:23-24; Kotze et al 1987). Moreover, government agencies are
frequently under-funded, unco-ordinated and inefficient at the local level, creating space for fluid
local politics which deeply complicates government approaches to state construction. In this
respect, South Africa faces the same structural development challenges as other post-colonial
regimes (Munro 1996).
The GNU has set out to address these constraints through a wide-ranging Reconstruction
and Development Programme (RDP) based on a new 'social partnership' or 'social compact'
which aims to eradicate perceptions of the state's overweening, dominant, or central role in
society. A central objective of the RDP is to 'build the capacity' of community-based
organisations to fill the void left by a retreating state.s As the government's first White Paper
on the RDP argued (GNU 1994:48): The empowerment of institutions of civil society is a fundamental aim of the Government's approach to building national consensus. Through this process the Government aims to draw on the creative energy of communities. To facilitate effective involvement, the Government will introduce programmes that will enhance the capacity of community organisations.
The government's Rural Development Strategy (GNU 1995) aims to combine economic
development and political development on the basis of three (populist) objectives:
entrepreneurship, employment and empowerment. The thrust of this approach is to bring
governance closer to the people, mainly by expanding the role of local authorities in delivering
basic services and spreading the responsibility for the distribution of public resources across
communily-bascd organisations (CBOs), non-government organisations (NGOs) as well as state
institutions. The approach is predicated on the capacity or propensity of rural communities to
undertake developmental collective action. Among rural communities where none of these
institutions are well developed, the developmental potential of growers' organisations stands out
as particularly promising. It is in these circumstances that they have emerged as a potentially
attractive focus for promoting 'community development and empowerment' (A'Bear et al 1994)
as well as economic development.
This paper aims to evaluate that vision by analysing the social relations of contract
production among sugar and timber small-growers in KwaZulu. This approach derives from the
perspective that the propensity of rural citizens to pursue developmental collective action is
conditioned by local patterns of social conflict and local mechanisms to mitigate it. Thus, the
underlying premise of the paper is that the capacity of contract farming to underwrite rural
empowerment is determined ultimately by the political dynamics that structure the organisation
of production under contract arrangements. Ultimately, an evaluation of the potential of contract
farming arrangements must begin with the peculiar social structure of the contract farmer's
enterprise which establishes a complex set of local-level power relations between farmers,
agribusiness, local authorities and communities. This requires an examination of the social
networks through which contract growers manage their access to the main social factors of
production - land, labour and capital inputs. The main aim of the paper is to delineate the power
relations that inform each of these dimensions of the farming operation in order to cast light on
the political underpinnings of growers' organisations as an institutional focus for rural
development. It shows that each of these dimensions generates flexible arrangements for
resource-utilisation which shape local-level social conflicts. Any developmental institution building
initiative that seeks to promote empowerment must be able to respond to these relations.
The paper proceeds in three parts. The first section briefly outlines the structural
political tensions that lie at the heart of a development vision based on economic
entrepreneurship and community empowerment. The second analyses the cash-cropping
enterprise and highlights incipient social conflicts that it generates. It shows that the factors of
production are commoditised to different degrees, and that growers engage in distinct, though
overlapping, social networks to manage their access to these factors. The third indicates the
complexities of moving from contract to community in development thinking, given the incipient
conflicts that structure the enterprise
Quantum Teleportation of Optical Quantum Gates
We show that a universal set of gates for quantum computation with optics can
be quantum teleported through the use of EPR entangled states, homodyne
detection, and linear optics and squeezing operations conditioned on
measurement outcomes. This scheme may be used for fault-tolerant quantum
computation in any optical scheme (qubit or continuous variable). The
teleportation of nondeterministic nonlinear gates employed in linear optics
quantum computation is discussed.Comment: 4 pages, 1 figure, published versio
Quantum error correction via robust probe modes
We propose a new scheme for quantum error correction using robust continuous
variable probe modes, rather than fragile ancilla qubits, to detect errors
without destroying data qubits. The use of such probe modes reduces the
required number of expensive qubits in error correction and allows efficient
encoding, error detection and error correction. Moreover, the elimination of
the need for direct qubit interactions significantly simplifies the
construction of quantum circuits. We will illustrate how the approach
implements three existing quantum error correcting codes: the 3-qubit bit-flip
(phase-flip) code, the Shor code, and an erasure code.Comment: 5 pages, 3 figure
Generalized Toffoli gates using qudit catalysis
We present quantum networks for a n-qubit controlled gate C^{n-1}(U) which
use a higher dimensional (qudit) ancilla as a catalyser. In its simplest form
the network has only n two-particle gates (qubit-qudit) -- this is the minimum
number of two-body interactions needed to couple all n+1 subsystems (n qubits
plus one ancilla). This class of controlled gates includes the generalised
Toffoli gate C^{n-1}(X) on n qubits, which plays an important role in several
quantum algorithms and error correction. A particular example implementing this
model is given by the dispersive limit of a generalised Jaynes-Cummings
Hamiltonian of an effective spin-s interacting with a cavity mode.Comment: 5 pages, 3 fig
Spectral Effects of Strong Chi-2 Non-Linearity for Quantum Processing
Optical non-linearity can be used for parametric amplification
and producing down-converted entangled photon pairs that have broad
applications. It is known that weak non-linear media exhibit dispersion and
produce a frequency response. It is therefore of interest to know how spectral
effects of a strong crystal affect the performance. Here we model
the spectral effects of the dispersion of a strong crystal and
illustrate how this affects its ability to perform Bell measurements and
influence the performance of a quantum gates that employ such a Bell
measurement. We show that a Dyson series expansion of the unitary operator is
necessary in general, leading to unwanted spectral entanglement. We identify a
limiting situation employing periodic poling, in which a Taylor series
expansion is a good approximation and this entanglement can be removed.Comment: Will be submitted to PR
Implementing Non-Projective Measurements via Linear Optics: an Approach Based on Optimal Quantum State Discrimination
We discuss the problem of implementing generalized measurements (POVMs) with
linear optics, either based upon a static linear array or including conditional
dynamics. In our approach, a given POVM shall be identified as a solution to an
optimization problem for a chosen cost function. We formulate a general
principle: the implementation is only possible if a linear-optics circuit
exists for which the quantum mechanical optimum (minimum) is still attainable
after dephasing the corresponding quantum states. The general principle enables
us, for instance, to derive a set of necessary conditions for the linear-optics
implementation of the POVM that realizes the quantum mechanically optimal
unambiguous discrimination of two pure nonorthogonal states. This extends our
previous results on projection measurements and the exact discrimination of
orthogonal states.Comment: final published versio
Integration of highly probabilistic sources into optical quantum architectures: perpetual quantum computation
In this paper we introduce a design for an optical topological cluster state
computer constructed exclusively from a single quantum component. Unlike
previous efforts we eliminate the need for on demand, high fidelity photon
sources and detectors and replace them with the same device utilised to create
photon/photon entanglement. This introduces highly probabilistic elements into
the optical architecture while maintaining complete specificity of the
structure and operation for a large scale computer. Photons in this system are
continually recycled back into the preparation network, allowing for a
arbitrarily deep 3D cluster to be prepared using a comparatively small number
of photonic qubits and consequently the elimination of high frequency,
deterministic photon sources.Comment: 19 pages, 13 Figs (2 Appendices with additional Figs.). Comments
welcom
Constructing 2D and 3D cluster states with photonic modules
Large scale quantum information processing (QIP) and distributed quantum
computation require the ability to perform entangling operations on a large
number of qubits. We describe a new photonic module which prepares,
deterministically, photonic cluster states using an atom in a cavity as an
ancilla. Based on this module we design a network for constructing 2D cluster
states and then we extend the architecture to 3D topological cluster states.
Advantages of our design include a passive switching mechanism and the
possibility of using global control pulses for the atoms in the cavity. The
architecture described here is well suited for integrated photonic circuits on
a chip and could be used as a basis of a future quantum optical processor or in
a quantum repeater node
Error tolerance and tradeoffs in loss- and failure-tolerant quantum computing schemes
Qubit loss and gate failure are significant problems for the development of scalable quantum computing. Recently, various schemes have been proposed for tolerating qubit loss and gate failure. These include schemes based on cluster and parity states. We show that by designing such schemes specifically to tolerate these error types we cause an exponential blowout in depolarizing noise. We discuss several examples and propose techniques for minimizing this problem. In general, this introduces a tradeoff with other undesirable effects. In some cases this is physical resource requirements, while in others it is noise rates
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