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Quantum Teleportation through Noisy Channels
Min, Hyegeun,Kim, Keun Ai,Oh, Sung Dahm 숙명여자대학교 자연과학연구소 2002 자연과학논문집 Vol.- No.13
주변환경과의 상호작용으로 인한 노이즈가 있는 양자 커뮤니케이션 채널은 적당한 Kraus 연산자 A_i에 의해 Kraus 재구성으로 단순화시킬 수 있다. 우리는 두 큐빗 계에서의 비트, 위상, 비트-위상, 크기 감폭, 위상 감폭, 편광 소멸에 대한 노이즈 모델을 세웠다. 우리는 그 각각의 노이즈를 가진 양자 채널에 대해 한 큐빗 원격이동을 수행했고, 신뢰도를 조사했다. The quantum communication channels which have noises by the interaction with environment can be modeled by the Kraus decompositon choosing the Kraus operators We establish the noise models; bit, phase and bit-phase flips, amplitude and phase dampings and depolarizing, for two qubit system. We perform a single qubit teleportation through the noisy two-qubit quantum channel and investigate the fidelity changes of final quantum state.
Min, Hyegeun,Moon, Dae Won,Lee, Tae Geol John Wiley Sons, Ltd. 2011 Surface and interface analysis Vol.43 No.1
<P><B>Abstract</B></P><P>Complementary use of medium‐energy ion‐scattering spectroscopy (MEIS) and time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) analyses was proposed as a new methodology for absolute quantification of functional groups in organic ultrathin films. First, MEIS analysis was used to determine the absolute areal densities of Ru dye molecules in organic ultrathin films, which were made by spin coating Ru 535‐bis TBA (C<SUB>58</SUB>H<SUB>86</SUB>O<SUB>8</SUB>N<SUB>8</SUB>S<SUB>2</SUB>Ru) solutions with varying concentrations. The thicknesses of the films were less than 2 nm each and the densities of these ultrathin layers were linearly correlated with the solution concentrations. The determined absolute areal densities of the Ru organic molecules were then used to calculate the areal densities of the stoichiometric functional groups. Secondly, the ToF‐SIMS intensities of the characteristic peaks such as Ru<SUP>+</SUP>, C<SUB>16</SUB>H<SUB>35</SUB>N<SUP>+</SUP>, CO<SUB>2</SUB><SUP>−</SUP>, CSN<SUP>−</SUP>, CSNRu<SUP>−</SUP>, etc, associated with the functional groups of a Ru 535‐bis TBA molecule were correlated by the densities of the Ru organic molecules. Our results show that the correlation curves obtained through the complementary use of MEIS and ToF‐SIMS techniques could be useful to quantify functional groups on organic ultrathin films. Copyright © 2010 John Wiley & Sons, Ltd.</P>
Min, Hyegeun,Yu, Hyunung,Son, Miyoung,Moon, Dae Won,Lee, Tae Geol John Wiley Sons, Ltd. 2011 Surface and interface analysis Vol.43 No.1
<P><B>Abstract</B></P><P>Mixed self‐assembled monolayers (SAMs) consisting of different molecules have been used to modify surface wettability, functionalize end groups for chemical binding, and control adsorption of proteins, DNA, or cells. In these applications, control over the quantification of the surface composition of a mixed SAM is especially important when designing biochips and biosensors. Previously, we presented a method by which ToF‐SIMS can be used to quantify the composition of two adsorbates with acetylene and propene functional groups from their secondary ion yield ratio in mixed SAMs on gold substrates. We concluded that although the ion yield ratio of the two adsorbates in mixed SAM was not equal to the mole fraction of Diyne (‐acetylene) and Diene (‐propene) in a solution, this was due to a different secondary ion formation, and not to the difference in the amount of adsorbates on the surface. In this study, we revisit the same sample system, this time applying a FT‐IR technique to test the accuracy of our previous findings. We found that the absorbances of the acetylene and propene functional groups neatly and linearly correlated with the mole fraction in the solution, which were consistent with our previous conclusions. We also used this methodology to quantify mixed silane SAMs on a silica surface. Our study shows that the ToF‐SIMS and FT‐IR techniques can complement one another and be useful to quantify mixed SAMs on various substrates. Copyright © 2010 John Wiley & Sons, Ltd.</P>
Min, Hyegeun,Son, Jin Gyeong,Kim, Jeong Won,Yu, Hyunung,Lee, Tae Geol,Moon, Dae Won Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.3
To develop a methodology for absolute determination of the surface areal density of functional groups on organic and bio thin films, medium energy ion scattering (MEIS) spectroscopy was utilized to provide references for calibration of X-ray photoelectron spectroscopy (XPS) or Fourier transformation-infrared (FT-IR) intensities. By using the MEIS, XPS, and FT-IR techniques, we were able to analyze the organic thin film of a Ru dye compound ($C_{58}H_{86}O_8N_8S_2Ru$), which consists of one Ru atom and various stoichiometric functional groups. From the MEIS analysis, the absolute surface areal density of Ru atoms (or Ru dye molecules) was determined. The surface areal densities of stoichiometric functional groups in the Ru dye compound were used as references for the calibration of XPS and FT-IR intensities for each functional group. The complementary use of MEIS, XPS, and FT-IR to determine the absolute surface areal density of functional groups on organic and bio thin films will be useful for more reliable development of applications based on organic thin films in areas such as flexible displays, solar cells, organic sensors, biomaterials, and biochips.