1,231 research outputs found
Quantum Data Hiding
We expand on our work on Quantum Data Hiding -- hiding classical data among
parties who are restricted to performing only local quantum operations and
classical communication (LOCC). We review our scheme that hides one bit between
two parties using Bell states, and we derive upper and lower bounds on the
secrecy of the hiding scheme. We provide an explicit bound showing that
multiple bits can be hidden bitwise with our scheme. We give a preparation of
the hiding states as an efficient quantum computation that uses at most one
ebit of entanglement. A candidate data hiding scheme that does not use
entanglement is presented. We show how our scheme for quantum data hiding can
be used in a conditionally secure quantum bit commitment scheme.Comment: 19 pages, IEEE style, 8 figures, submitted to IEEE Transactions on
Information Theor
In vitro propagation of Wahlenbergia stricta (R.Br.) sweet subsp. stricta, an adventive plant in New Zealand, can yield plants capable of flowering and setting viable seeds
Root induction in radiata pine using Agrobacterium rhizogenes
Root induction using Agrobacterium rhizogenes was conducted in
hypocotyl explants, intact seedlings, de-rooted seedling cuttings and
adventitious shoots of radiata pine ( Pinus radiata D. Don). Use of
two A. rhizogenes strains (A4T and LB9402), with or without application
of IBA, can trigger root formation in different explants. Strain
LBA9402 was more effective than A4T in increasing rooting percentage
and root number. Addition of 4.4 uMIBA to the medium further enhanced
rooting from the cultured hypocotyl segments inoculated with the two A.
rhizogenes strains. Strain LBA9402+IBA induced in about 75% of the
cultured hypocotyl segments to form roots. In contrast the controls
failed to initiate roots on intact seedlings or cultured segments in
presence or absence of IBA. Rooting of adventitious shoots from 3
year-old radiata pine was improved following inoculation with LBA9402,
suggesting that this rooting treatment has potential to aid clonal
propagation of radiata pine
Locking classical correlation in quantum states
We show that there exist bipartite quantum states which contain large hidden
classical correlation that can be unlocked by a disproportionately small amount
of classical communication. In particular, there are -qubit states for
which a one bit message doubles the optimal classical mutual information
between measurement results on the subsystems, from bits to bits.
States exhibiting this behavior need not be entangled. We study the range of
states exhibiting this phenomenon and bound its magnitude.Comment: 7 pages, revtex
The entanglement of purification
We introduce a measure of both quantum as well as classical correlations in a
quantum state, the entanglement of purification. We show that the (regularized)
entanglement of purification is equal to the entanglement cost of creating a
state asymptotically from maximally entangled states, with negligible
communication. We prove that the classical mutual information and the quantum
mutual information divided by two are lower bounds for the regularized
entanglement of purification. We present numerical results of the entanglement
of purification for Werner states in .Comment: 12 pages RevTex, 1 figure, to appear in JMP special issue on quantum
information. v3 contains additional references, motivation, and a small
change in the figur
Real time forecasting and automatic species classification of harmful algal blooms (HAB) for fisheries management
Hiding bits in Bell states
We present a scheme for hiding bits in Bell states that is secure even when
the sharers Alice and Bob are allowed to carry out local quantum operations and
classical communication. We prove that the information that Alice and Bob can
gain about a hidden bit is exponentially small in , the number of qubits in
each share, and can be made arbitrarily small for hiding multiple bits. We
indicate an alternative efficient low-entanglement method for preparing the
shared quantum states. We discuss how our scheme can be implemented using
present-day quantum optics.Comment: 4 pages RevTex, 1 figure, various small changes and additional
paragraph on optics implementatio
Response of Arabidopsis thaliana seedlings to lead exposure: effect of pre-treatment with sodium nitroprusside
Plants are regularly exposed to unfavorable conditions that impose stress. Lead (Pb), is one of the major pollutants in the environment that causes serious public health and environmental concerns. Increasing levels of lead could also have severe consequences for plants. Plants exposed to lead stress initiate signaling pathways, and make specific changes in their cell physiology and metabolism to avoid or tolerate the stress. However, mechanisms to reduce the effects of lead may vary from plant to plant, developmental stage, and culture medium.
Nitric oxide is an important signaling molecule in plant development and defense responses. It has been shown to play a major role in plant responses to several abiotic stresses, such as heat, chilling, drought, salt, UV irradiation and ozone exposure.
The objective of this study is to examine the physiological responses to Pb exposure of Arabidopsis thaliana seeds pre-treated with sodium nitroprusside (SNP), a nitric oxide donor. All experiments were carried out using 7-day-old seedlings in a laboratory environment. Pb contents were determined using a graphite furnace spectrometer. Antioxidant assays and reactive oxygen species were carried out using a microplate reader. A major finding is that Pb treatment resulted in increased oxidative stress, which was counteracted by SNP pre-treatment. This and other results obtained are discussed in relation to a strategy to tolerate Pb accumulation in plant cells
Quantum Channel Capacity of Very Noisy Channels
We present a family of additive quantum error-correcting codes whose
capacities exceeds that of quantum random coding (hashing) for very noisy
channels. These codes provide non-zero capacity in a depolarizing channel for
fidelity parameters when . Random coding has non-zero capacity
only for ; by analogy to the classical Shannon coding limit, this
value had previously been conjectured to be a lower bound. We use the method
introduced by Shor and Smolin of concatenating a non-random (cat) code within a
random code to obtain good codes. The cat code with block size five is shown to
be optimal for single concatenation. The best known multiple-concatenated code
we found has a block size of 25. We derive a general relation between the
capacity attainable by these concatenation schemes and the coherent information
of the inner code states.Comment: 31 pages including epsf postscript figures. Replaced to correct
important typographical errors in equations 36, 37 and in tex
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