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Corruption and bureaucratic structure in a developing economy
We address the impact of corruption in a developing economy in the context of an
empirically relevant hold-up problem - when a foreign firm sinks an investment to
provide infrastructure services. We focus on the structure of the economy’s
bureaucracy, which can be centralized or decentralized, and characterize the
‘corruptibility’ of bureaucrats in each case. Results are explained in terms of the noninternalization,
under decentralization, of the ‘bribe externality’ and the ‘price
externality.’ In welfare terms, decentralization is favoured, relatively speaking, if the
tax system is less inefficient, funding is less tight, bureaucrats are less venal, or
compensation for expropriation is ungenerous
Regulatory barriers and entry in developing economies
We model entry by entrepreneurs into new markets in developing economies with
regulatory barriers in the form of licence fees and bureaucratic delay. Because laissez
faire leads to ‘excessive’ entry, a licence fee can increase welfare by discouraging
entry. However, in the presence of a licence fee, bureaucratic delay creates a strategic
opportunity, which can result in both greater entry by first movers and a higher
steady-state number of firms. Delay also leads to speculation, with entrepreneurs
taking out licences to obtain the option of immediate entry if they later observe the
industry to be profitable enough
On entanglement-assisted classical capacity
This paper is essentially a lecture from the author's course on quantum
information theory, which is devoted to the result of C. H. Bennett, P. W.
Shor, J. A. Smolin and A. V. Thapliyal (quant-ph/0106052) concerning
entanglement-assisted classical capacity of a quantum channel. A modified proof
of this result is given and relation between entanglement-assisted and
unassisted classical capacities is discussed.Comment: 10 pages, LATE
Entanglement of pure states for a single copy
An optimal local conversion strategy between any two pure states of a
bipartite system is presented. It is optimal in that the probability of success
is the largest achievable if the parties which share the system, and which can
communicate classically, are only allowed to act locally on it. The study of
optimal local conversions sheds some light on the entanglement of a single copy
of a pure state. We propose a quantification of such an entanglement by means
of a finite minimal set of new measures from which the optimal probability of
conversion follows.Comment: Revtex, 4 pages, no figures. Minor changes. Appendix remove
Handbook of noise ratings
Handbook announced in Tech Brief is compendium of information describing multifarious noise methods now in use. Reference material gives user better access to definitions, application, and calculation procedures of current noise rating methods
Full counting statistics and conditional evolution in a nanoelectromechanical system
We study theoretically the full distribution of transferred charge in a
tunnel junction (or quantum point contact) coupled to a nanomechanical
oscillator, as well as the conditional evolution of the oscillator. Even if the
oscillator is very weakly coupled to the tunnel junction, it can strongly
affect the tunneling statistics and lead to a highly non-Gaussian distribution.
Conversely, given a particular measurement history of the current, the
oscillator energy distribution may be localized and highly non-thermal. We also
discuss non-Gaussian correlations between the oscillator motion and tunneling
electrons; these show that the tunneling back-action cannot be fully described
as an effective thermal bath coupled to the oscillator.Comment: 7 pages; figure added; typos correcte
Mixedness and teleportation
We show that on exceeding a certain degree of mixedness (as quantified by the
von Neumann entropy), entangled states become useless for teleporatation. By
increasing the dimension of the entangled systems, this entropy threshold can
be made arbitrarily close to maximal. This entropy is found to exceed the
entropy threshold sufficient to ensure the failure of dense coding.Comment: 6 pages, no figure
Quantifying nonorthogonality
An exploratory approach to the possibility of analyzing nonorthogonality as a
quantifiable property is presented. Three different measures for the
nonorthogonality of pure states are introduced, and one of these measures is
extended to single-particle density matrices using methods that are similar to
recently introduced techniques for quantifying entanglement. Several
interesting special cases are considered. It is pointed out that a measure of
nonorthogonality can meaningfully be associated with a single mixed quantum
state. It is then shown how nonorthogonality can be unlocked with classical
information; this analysis reveals interesting inequalities and points to a
number of connections between nonorthogonality and entanglement.Comment: Accepted for publication in Phys. Rev.
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