[show abstract][hide abstract] ABSTRACT: In this paper, we give the most general duality gates, or generalized quantum gates in duality quantum computers. Here we show by explicit construction that a n-bit duality quantum computer with d slits can be simulated perfectly with an ordinary quantum computer with n qubits and one auxiliary qudit. Using this model, we give the most general form of duality gates which is of the form Σd-1i = 0 pi U i, and the pi's are complex numbers with module less or equal to 1 and constrained by |Σi pi|≤1.
Communications in Theoretical Physics 01/2009; 51(1):65. · 0.95 Impact Factor
[show abstract][hide abstract] ABSTRACT: In this letter, we propose a duality computing mode, which resembles particle-wave duality property when a quantum system such as a quantum computer passes through a double-slit. In this mode, computing operations are not necessarily unitary. The duality mode provides a natural link between classical computing and quantum computing. In addition, the duality mode provides a new tool for quantum algorithm design.
Communications in Theoretical Physics 01/2009; 50(6):1303. · 0.95 Impact Factor
[show abstract][hide abstract] ABSTRACT: Background and objective Different isoforms of p120-catenin (p120ctn), the members of catenin family, are variably expressed in different tissues and cells. These isoforms may confer different properties with respect to cell adhesion and migration, but this concept needs experimental evidence. Methods To more precisely define their biological roles, we stably transfected isoforms 1A and 3A into the lung cancer cell lines A549 and NCI-H460, which had low expression of p120ctn. Using RT-PCR, Western Blot, and Transwell, we testified their impact on the expression of E-cadherin, β-catenin, and the invasiveness of lung cancer cells. Results Expression of isoform 1A of p120ctn upregulated E-cadherin and β-catenin, as well as the ability of cells to invasion. In contrast, overexpression of isoform 3A had a smaller influence on invasion. Conclusion P120ctn isoforms 1A and 3A may differently
[show abstract][hide abstract] ABSTRACT: Background and objective p120-catenin (p120ctn), a member of the Armadillo gene family, hasemerged as an important modulator of small GTPase activities. Therefore, it plays novel roles in tumor malignant phenotype,such as invasion and metastasis, whose mechanism are not well clarified yet. The aim of this study is to explore theroles of p120ctn on the regulation of small GTP family members in lung cancer and the effects to lung cancer invasions andmetastasis. Methods After p120ctn was knocked down by siRNA, in vivo and in vitro analysis was applied to investigatethe role and possible mechanism of p120ctn in lung cancer, such as Western Blot, pull-down analysis, and nude mice models.Results p120ctn depletion inactivated RhoA, with the the activity of Cdc42 and Rac1 increased, the invasiveness oflung cancer cells was promoted both in vitro and in vivo . Conclusion p120ctn gene knockdown enhances the metastasis oflung cancer cells, probably by altering expression of small GTPase, such as inactivation of RhoA and activation of Cdc42/Rac1.
[show abstract][hide abstract] ABSTRACT: We propose a scheme of quantum computation with nonlinear quantum optics. Polarization states of photons are used for qubits. Photons with different frequencies represent different qubits. Single qubit rotation operation is implemented through optical elements like the Faraday polarization rotator. Photons are separated into different optical paths, or merged into a single optical path using dichromatic mirrors. The controlled-NOT gate between two qubits is implemented by the proper combination of parametric up and down conversions. This scheme has the following features: (1) No auxiliary qubits are required in the controlled-NOT gate operation; (2) No measurement is required in the course of the computation; (3) It is resource efficient and conceptually simple.
Communications in Theoretical Physics 02/2008; 49(1):107. · 0.95 Impact Factor
[show abstract][hide abstract] ABSTRACT: Background and objective p120ctn plays an important role in cell adhesion and has a significant association with tumorigenesis. To investigate the expression of p120ctn (p120 cateinin) isoforms in lung squamous cell carcinomas and adenocarcinomas, and analyze the correlation between p120ctn and clinicopathological parameters. Methods The expression patterns of p120ctn in lung cancer tissues and the corresponding normal lung tissues were examined by reverse transcription-polymerase chain reaction (RT-PCR). Immunofluorescence, RT-PCR, and Western blot were used to investigate the expression of p120ctn isoforms in lung cancer cell lines BE1 and LH7. Results Compared with corresponding normal lung tissues, lung cancer tissues have significantly lower levels of total mRNA, isoform1 and 3 mRNA (P<0.001, P<0.001, P=0.001). Furthermore, reduction of p120ctn isoform 1 mRNA is negatively associated-whereas p120ctn isoform 3 is positively associated-with lymphatic metastasis (P=0.01, P=0.029). BE1 cells with 94% metastatic frequency has lower levels of p120ctn isoforms than LH7 cells with low metastatic potential. Conclusion Reductions of p120ctn isoform 1 and 3 mRNA is a common phenomenon in lung cancer tissues and may play a role in metastasis progression of human lung cancer.
[show abstract][hide abstract] ABSTRACT: The ground state entanglement in an isotropic three-qubit transverse XY chain with energy current is analysed. A quantum phase transition from a no-energy-current phase to energy-current phase is found when the magnetic field changes. It has also been found that the ground state changes in company with the quantum phase transition.
Chinese Physics Letters 01/2007; 24(1):8. · 0.81 Impact Factor