138 research outputs found
The bioequivalence problem and the quantum estimation
Thesis (Ph. D. in Science)--University of Tsukuba, (A), no. 2835, 2002.3.25Includes bibliographical reference
Optimization of single strand DNA incorporation reaction by Moloneymurine leukaemia virus reverse transcriptase
Experimental investigation of pulsed entangled photons and photonic quantum channels
The development of key devices and systems in quantum information technology,
such as entangled particle sources, quantum gates and quantum cryptographic
systems, requires a reliable and well-established method for characterizing how
well the devices or systems work. We report our recent work on experimental
characterization of pulsed entangled photonic states and photonic quantum
channels, using the methods of state and process tomography. By using state
tomography, we could reliably evaluate the states generated from a two-photon
source under development and develop a highly entangled pulsed photon source.
We are also devoted to characterization of single-qubit and two-qubit photonic
quantum channels. Characterization of typical single-qubit decoherence channels
has been demonstrated using process tomography. Characterization of two-qubit
channels, such as classically correlated channels and quantum mechanically
correlated channels is under investigation. These characterization techniques
for quantum states and quantum processes will be useful for developing photonic
quantum devices and for improving their performances.Comment: 12 pages, 8 figures, in Quantum Optics in Computing and
Communications, Songhao Liu, Guangcan Guo, Hoi-Kwong Lo, Nobuyuki Imoto,
Eds., Proceedings of SPIE Vol. 4917, pp.13-24 (2002
Complete Genome Sequence of the Marine Carbazole-Degrading Bacterium Erythrobacter sp. Strain KY5
Hypothesis testing for an entangled state produced by spontaneous parametric down conversion
Generation and characterization of entanglement are crucial tasks in quantum
information processing. A hypothesis testing scheme for entanglement has been
formulated. Three designs were proposed to test the entangled photon states
created by the spontaneous parametric down conversion. The time allocations
between the measurement vectors were designed to consider the anisotropic
deviation of the generated photon states from the maximally entangled states.
The designs were evaluated in terms of the p-value based on the observed data.
It has been experimentally demonstrated that the optimal time allocation
between the coincidence and anti-coincidence measurement vectors improves the
entanglement test. A further improvement is also experimentally demonstrated by
optimizing the time allocation between the anti-coincidence vectors. Analysis
on the data obtained in the experiment verified the advantage of the
entanglement test designed by the optimal time allocation.Comment: 7 figures, 9 pages. This paper is revised for increasing the
readership for experimentalists. Hence, the mathematical part is moved to a
new manuscript quant-ph/060802
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