Process reconstruction from incomplete and/or inconsistent data

We analyze how an action of a qubit channel (map) can be estimated from the measured data that are incomplete or even inconsistent. That is, we consider situations when measurement statistics is insufficient to determine consistent probability distributions. As a consequence either the estimation (reconstruction) of the channel completely fails or it results in an unphysical channel (i.e., the corresponding map is not completely positive). We present a regularization procedure that allows us to derive physically reasonable estimates (approximations) of quantum channels. We illustrate our procedure on specific examples and we show that the procedure can be also used for a derivation of optimal approximations of operations that are forbidden by the laws of quantum mechanics (e.g., the universal NOT gate).Comment: 9pages, 5 figure

Entanglement for a Bimodal Cavity Field Interacting with a Two-Level Atom

Negativity has been adopted to investigate the entanglement in a system composed of a two-level atom and a two-mode cavity field. Effects of Kerr-like medium and the number of photon inside the cavity on the entanglement are studied. Our results show that atomic initial state must be superposed, so that the two cavity field modes can be entangled. Moreover, we also conclude that the number of photon in the two cavity mode should be equal. The interaction between modes, namely, the Kerr effect, has a significant negative contribution. Note that the atom frequency and the cavity frequency have an indistinguishable effect, so a corresponding approximation has been made in this article. These results may be useful for quantum information in optics systems.Comment: Accepted by Commun. Theor. Phy

Monovalent counterion distributions at highly charged water interfaces: Proton-transfer and Poisson-Boltzmann theory

Surface sensitive synchrotron-X-ray scattering studies reveal the distributions of monovalent ions next to highly charged interfaces. A lipid phosphate (dihexadecyl hydrogen-phosphate) was spread as a monolayer at the air-water interface, containing CsI at various concentrations. Using anomalous reflectivity off and at the $L_3$ Cs$^+$ resonance, we provide, for the first time, spatial counterion distributions (Cs$^+$) next to the negatively charged interface over a wide range of ionic concentrations. We argue that at low salt concentrations and for pure water the enhanced concentration of hydroniums H$_3$O$^+$ at the interface leads to proton-transfer back to the phosphate group by a high contact-potential, whereas high salt concentrations lower the contact-potential resulting in proton-release and increased surface charge-density. The experimental ionic distributions are in excellent agreement with a renormalized-surface-charge Poisson-Boltzmann theory without fitting parameters or additional assumptions

Penggunaan Metode Eoq dan Epq dalam Meminimumkan Biaya Persediaan Minyak Sawit Mentah (Cpo) (Studi Kasus : PT. Xyz)

Kekurangan atau kelebihan persediaan merupakan faktor yang memicu peningkatan biaya. Perencanaan persediaan dan pengoptimalan produksi sangat diperlukan untuk memperoleh pendapatan maksimum dan meminimumkan biaya. Metode Economic Order Quantity (EOQ) dan Economic Production Quantity (EPQ) merupakan metode persediaan yang dapat digunakan untuk menyelesaikan masalah pengendalian persediaan. Dengan melakukan pengkajian terhadap kasus persediaan minyak sawit mentah (CPO) di PT. XYZ maka diperoleh jumlah pemesanan paling optimal (EOQ) pada tahun 2011 sebanyak 1.138 ton dan tahun 2012 sebanyak 1.092 ton, sedangkan dengan menggunakan metode EPQ diperoleh jumlah produksi optimalnya yaitu pada tahun 2011 sebesar 19.713 ton dan tahun 2012 sebesar 16.947 ton. Total biaya persediaan dengan metode EPQ menunjukkan adanya penghematan jika dibandingkan dengan kebijakan Perusahaan yaitu total biaya persediaan sebesar Rp 707.293.646,191 pada tahun 2011 dan Rp 675.088,663 pada tahun 2012

Distributed fault estimation with randomly occurring uncertainties over sensor networks

This paper is concerned with the distributed fault estimation problem for a class of uncertain stochastic systems over sensor networks. The norm-bounded uncertainty enters into the system in a random way governed by a set of Bernoulli distributed white sequence. The purpose of the addressed problem is to design distributed fault estimators, via available output measurements from not only the individual sensor, but also its neighbouring sensors, such that the fault estimation error converges to zero exponentially in the mean square while the disturbance rejection attenuation is constrained to a give level by means of the H∞ performance index. Intensive stochastic analysis is carried out to obtain sufficient conditions for ensuring the exponential stability as well as prescribed H∞ performance for the overall estimation error dynamics. Simulation results are provided to demonstrate the effectiveness of the proposed fault estimation technique in this paper.This work was supported in part by the National Natural Science Foundation of China [ grant number 61329301], [grant number 61422301], [grant number 61374127]; the Outstanding Youth Science Foundation of Heilongjiang Province [grant number JC2015016]; the Alexander von Humboldt Foundation of Germany

Generalized Poincare algebras, Hopf algebras and kappa-Minkowski spacetime

We propose a generalized description for the kappa-Poincare-Hopf algebra as a symmetry quantum group of underlying kappa-Minkowski spacetime. We investigate all the possible implementations of (deformed) Lorentz algebras which are compatible with the given choice of kappa-Minkowski algebra realization. For the given realization of kappa-Minkowski spacetime there is a unique kappa-Poincare-Hopf algebra with undeformed Lorentz algebra. We have constructed a three-parameter family of deformed Lorentz generators with kappa-Poincare algebras which are related to kappa-Poincare-Hopf algebra with undeformed Lorentz algebra. Known bases of kappa-Poincare-Hopf algebra are obtained as special cases. Also deformation of igl(4) Hopf algebra compatible with the kappa-Minkowski spacetime is presented. Some physical applications are briefly discussed.Comment: 15 pages; journal version; Physics Letters B (2012

Noncommutative Field Theory from twisted Fock space

We construct a quantum field theory in noncommutative spacetime by twisting the algebra of quantum operators (especially, creation and annihilation operators) of the corresponding quantum field theory in commutative spacetime. The twisted Fock space and S-matrix consistent with this algebra have been constructed. The resultant S-matrix is consistent with that of Filk\cite{Filk}. We find from this formulation that the spin-statistics relation is not violated in the canonical noncommutative field theories.Comment: 13 pages, 1 figure, minor changes, add reference

Analisis Kinerja Pengurus dalam Meningkatkan Shu pada Koperasi Karyawan Mekar PT Pln Wilayah Kalbar di Kubu Raya

Penelitian ini bertujuan untuk mengetahui kinerja pengurus dalam meningkatkan SHU pada Koperasi Karyawan Mekar PT PLN wilayah Kalbar di Pontianak. Metode yang digunakan dalam penelitian ini adalah metode deskriptif. Penelitian ini menggunakan teknik pengumpulan data berupa komunikasi langsung dengan alat pengumpul data berupa pedoman wawancara, dan studi dokumenter yang berupa lembar catatan. Hasil penelitian menunjukkan bahwa Pengurus Koperasi Karyawan Mekar PT PLN Wilayah Kalimantan Barat di Kubu Raya melakukan empat indikator kinerja. Berikut kesimpulan secara khusus dari kinerja pengurus di Koperasi Karyawan Mekar PT PLN Wilayah Kalimantan Barat di Kubu Raya: 1) Kemampuan berkomunikasi dilihat dari kemampuan memahami pesan yang diampaikan anggota, adanya interaksi antara pengerus dengan anggota maupun sesama pengurus, mampu mempengaruhi melalui pesan yang disampaikan 2) Kemampuan melaksanakan program kerja dilihat dari mampu membuat laporan pertanggung jawaban denga benar, melakukan pembagian SHU sesuai dengan AD ART, menyelenggarakan RAT secara rutin 3) Kemampuan mengelola koperasi dilihat dari mampu menjalin hubungan yang baik dengan komponen koperasi, mampu mengkoordinir seluruh unit USAha, mampu mengkoordinir SDM yang ada, mengadakan rapat pengurus secara rutin, menjalankan tugas sesuai dengan apa yang telah diamanahkan, mampu bekerjasama sebagai sebuah tim, 4) kemampuan mengambil keputusan dilihat dari dapat memberikan respon positif dari suatu masalah, mampu menjalin dan menjaga hubungan yang baik dengan pihak lain. Kata Kunci: Kinerja Pengurus, Meningkatkan SHU Abstrack: This study was aimed to determine the performance of the management in improving the SHU Employees Cooperative Mekar PT PLN region West Borneo in Pontianak. The method used in this research is descriptive method. This study uses data collection techniques in the form of direct communication with a data collector in the form of interview, and documentary studies in the form of a record sheet. The results showed that the Employees Cooperative Management Mekar PT PLN Kalimantan Barat in Kubu Raya doing four performance indicators. The following conclusions exclusively on performance management in the Cooperative Employees Mekar PT PLN Kalimantan Barat in Kubu Raya: 1) The ability to communicate the views from the ability to understand the message that diampaikan members, the interaction between pengerus with members and fellow administrators, able to influence through a message delivered 2 ) the ability to carry out the work program of visits of being able to make the accountability report of premises properly, perform the division SHU accordance with AD ART, organized RAT routinely 3) the ability to manage the cooperative visits from able to establish a good relationship with the components cooperative, able to coordinate all business units, capable coordinating human resources, held a board meeting on a regular basis, carry out duties in accordance with what has been mandated, able to work together as a team, 4) the ability to take a decision viewed from can give a positive response to a problem, be able to establish and maintain a good relationship with the other