Cooperatively enhanced precision of hybrid light-matter sensors

We consider a hybrid system of matter and light as a sensing device and quantify the role of cooperative effects. The latter generically enhance the precision with which modifications of the effective light-matter coupling constant can be measured. In particular, considering a fundamental model of N qubits coupled to a single electromagnetic mode, we demonstrate that the ultimate bound for the precision shows double-Heisenberg scaling: Delta theta proportional to 1/(Nn), with N and n the number of qubits and photons, respectively. Moreover, even using classical states and measuring only one subsystem, a Heisenberg-times-shot-noise scaling, i.e., 1/(N root n) or 1/(n root N), is reached. As an application, we show that a Bose-Einstein condensate trapped in a double-well optical lattice within an optical cavity can in principle be used to detect the gravitational acceleration g with the relative precision of Delta g/g similar to 10(-4) Hz(-1/2). The analytical approach presented in this study takes into account the leakage of photons through the cavity mirrors, and allows one to determine the sensitivity when g is inferred via measurements on atoms or photons

Cooperatively-enhanced precision of hybrid light-matter sensors

We consider a hybrid system of matter and light as a sensing device and quantify the role of cooperative effects. The latter generically enhance the precision with which modifications of the effective light-matter coupling constant can be measured. In particular, considering a fundamental model of $N$ qubits coupled to a single electromagnetic mode, we show that the ultimate bound for the precision shows double-Heisenberg scaling: $\Delta\theta\propto1/(Nn)$, with $N$ and $n$ being the number of qubits and photons, respectively. Moreover, even using classical states and measuring only one subsystem, a Heisenberg-times-shot-noise scaling, i.e. $1/(N\sqrt{n})$ or $1/(n\sqrt{N})$, is reached. As an application, we show that a Bose-Einstein condensate trapped in a double-well potential within an optical cavity can detect the gravitational acceleration $g$ with the relative precision of $\Delta g/g\simeq10^{-9}\text{Hz}^{-1/2}$. The analytical approach presented in this study takes into account the leakage of photons through the cavity mirrors, and allows to determine the sensitivity when $g$ is inferred via measurements on atoms or photons.Comment: 13 pages, 3 figure

Purification and recovery of laccase produced by submerged cultures of Trametes versicolor by three-phase partitioning as a simple and highly efficient technique

In this work, three-phase partitioning (TPP) was used for the purification of laccase from liquid cultures of Trametes versicolor. For determining the optimal conditions of TPP process, parameters such as initial pH (6.5, 7.0, 7.5, 8.0), ammonium sulphate saturation (20%-80%) and the water phase to tert-butanol ratio (1:0.5, 1:1, 1:2), were analyzed. The best conditions with 73% recovery and 24-fold purification was obtained with the use of 50% saturation with ammonium sulphate, water phase to tert-butanol ratio of 1:1 and initial pH 7.0. The molecular mass of the purified laccase secreted by analyzed strain T. versicolor was found for ≈ 66 kDa. The results showed that TPP is an efficient method for the fractionation and purification of laccase obtained from liquid cultures of T. versicolor and it allows for obtaining the relatively pure enzyme without the use of time-consuming and costly chromatographic methods

The Impacts of Internal and External Factors on Dynamics of Traditional Fishermen Group in Manado Reclamation Area of Manado City, North Sulawesi Province

Title (Bahasa Indonesia): Pengaruh faktor internal dan eksternal terhadap dinamika kelompok nelayan tradisional di kawasan reklamasi Pantai Kota Manado,Provinsi Sulawesi Utara Afishermen group is a forum for fishermencooperation formed in oneregion to be able to become qualifiedfishermen. This requires that fishermen have the motion or power that can determine and influence the behavior of groups and their members in achieving their goals effectively. Fishermangroups should always be dynamic in running fishing business. This study aims to 1) analyze the factors that affectthe dynamics of traditional fishing groups in the coastal reclamation area of Manado City, and 2) determine the dynamics model of traditional fishermen groups in the coastal reclamation area of Manado City. This research wasconducted using survey method. F test statistics wasused for mixedinfluence test and t-test statistic for partial test. Multiple linear regressions was conductedto describe the dynamics of traditional fishermen group in the coastal reclamation area of Manado City. The result of this research concluded that internal (X1) and external (X2) factors together or partially hasan effect on dynamics of traditional fisherman group of coastal reclamation area of Manado City. Partially, internal sub factor (education level and experience of fishing effort) and external sub factor (the availability of capital aid and information availability) have real effect ondynamics of traditional fisherman group of coastal reclamation area of Manado City. The dynamicequationmodel of traditional coastal reclamation area of Manado CityisY = 0,770774 + 0,344691X1+ 0,388735X2.Kelompok nelayan merupakan wadah kerjasama dari nelayan dalam satu wilayah untuk dapat mencapai nelayan yang berkualitas. Hal ini mengharuskan nelayan memiliki gerak atau kekuatan yang dapat menentukan dan mempengaruhi perilaku kelompok dan anggota-anggotanya dalam mencapai tujuan secara efektif. Kelompok nelayan harus selalu dinamis dalam menjalankan usaha penangkapan ikan. Penelitian ini bertujuan untuk 1) menganalisis faktor-faktor yang mempengaruhi dinamika kelompok nelayan tradisional di kawasan reklamasi pantai Kota Manado, dan 2) menentukan model dinamika kelompok nelayan tradisional di kawasan reklamasi pantai Kota Manado. Penelitian ini mengunakan metode survey. Statistika Uji-F digunakan untuk uji pengaruh secara bersama-sama dan Statistika Uji-t untuk uji parsial. Regresi linear berganda dilakukan untuk menggambarkan persamaan dinamika kelompok nelayan tradisional di kawasan reklamasi pantai Kota Manado. Dari hasil penelitian dapat disimpulkan, bahwa faktor internal (X1) dan eksternal (X2) secara bersama-sama maupun parsial berpengaruh nyata terhadap dinamika kelompok nelayan tradisional. Secara parsial sub-faktor internal (tingkat pendidikan dan pengalaman usaha penangkapan ikan) dan sub-faktor eksternal (ketersediaan bantuan modal dan ketersediaan informasi) berpengaruh nyata terhadap dinamika kelompok nelayan tradisional. Model persamaan dinamika kelompok nelayan tradisional kawasan reklamasi pantai Kota Manado, yaitu: Y= 0,770774 + 0,344691X1+ 0,388735X2

Purification and recovery of laccase produced by submerged cultures of Trametes versicolor by three-phase partitioning as a simple and highly efficient technique

In this work, three-phase partitioning (TPP) was used for the purification of laccase from liquid cultures of Trametes versicolor. For determining the optimal conditions of TPP process, parameters such as initial pH (6.5, 7.0, 7.5, 8.0), ammonium sulphate saturation (20%-80%) and the water phase to tert-butanol ratio (1:0.5, 1:1, 1:2), were analyzed. The best conditions with 73% recovery and 24-fold purification was obtained with the use of 50% saturation with ammonium sulphate, water phase to tert-butanol ratio of 1:1 and initial pH 7.0. The molecular mass of the purified laccase secreted by analyzed strain T. versicolor was found for ≈ 66 kDa. The results showed that TPP is an efficient method for the fractionation and purification of laccase obtained from liquid cultures of T. versicolor and it allows for obtaining the relatively pure enzyme without the use of time-consuming and costly chromatographic methods