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    An experimental demonstration of quantum NOT gate: transition from classical to quantum regime
    (© 2010 IEEE, 2010) Sajeed, Shihan; Haider, A F M Yusuf; Department of Mathematics and Natural Sciences, BRAC University
    Path of a photon was considered to be used as qubit for implementing quantum NOT gate. An experimental setup was designed using a Mach-Zehnder interferometer constructed from simple optical devices such as He-Ne lasers, beam splitters, mirrors, attenuators etc. and quantum interference was utilized for multi photon case. A number of experiments were performed and the outcome of the experiment was observed by taking a number of photographs of the output beam for a number of input intensities. The observations proved that the setup indeed performed the required NOT transformation with good reliability at multi photon case and thus can be usefully used as a quantum not gate.
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    A quick method to determine the impurity content in gold ornaments by LIBS technique
    (© 2015 SciTePress, 2015) Haider, A F M Yusuf; Sengupta, S.; Abedin, K. M.; Department of Mathematics and Natural Sciences, BRAC University
    Laser induced breakdown spectroscopy (LIBS) and low energy dispersive X-ray fluorescence (ED-XRF) spectrometer, were used to determine the line intensity and concentration ratios of the major impurities (Cu and Ag) with respect to Au in gold ornaments with different caratage. Calibration curves were drawn with the data sets, obtained from LIBS and XRF, and from these calibration curves the unknown caratage of gold ornaments were obtained by using the line intensity of elements determined by LIBS. We have demonstrated the accuracy of this method by comparing the result with the carat value obtained by typical XRF method. This is yet another novel application of LIBS as a versatile analytic technique.