A two-step MaxLik-MaxEnt strategy to infer photon distribution from on/off measurement at low quantum efficiency

A method based on Maximum-Entropy (ME) principle to infer photon distribution from on/off measurements performed with few and low values of quantum efficiency is addressed. The method consists of two steps: at first some moments of the photon distribution are retrieved from on/off statistics using Maximum-Likelihood estimation, then ME principle is applied to infer the quantum state and, in turn, the photon distribution. Results from simulated experiments on coherent and number states are presented.Comment: 4 figures, to appear in EPJ

PENGARUH REBRANDING DAN REPOSITIONING TERHADAP BRAND EQUITY SMARTPHONE MICROSOFT LUMIA

Rebranding merupakan proses perubahan brand, nama, dan logo dari suatu brand yang sudah ada. Salah satu tahap dari rebranding adalah repositioning untuk mengubah posisi brand tersebut di benak konsumen. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh rebranding dan repositioning terhadap brand equity smartphone Microsoft Lumia di mata penggunanya. Penelitian dilakukan dengan cara menyebarkan kuesioner kepada 175 orang responden. Responden tersebut adalah pengguna Lumia sejak era Nokia. Dari hasil penelitian tersebut kemudian diolah dan dibentuk menjadi suatu model penelitian. Selanjutnya akan dilakukan pengolahan data dengan menggunakan Structural Equation Modeling untuk membuktikan hubungan dari masing-masing variabel penelitian. Hasil penelitian ini menunjukkan bahwa rebranding tidak berpengaruh terhadap brand equity apabila brand yang dilakukan rebranding memiliki persepsi yang positif di mata konsumen. Selain itu, repositioning juga lebih memberikan pengaruh langsung terhadap brand equity

COVID-19 as a catalyst for collaborative city-making: from emergency to praxis

The crisis resulting from the spread of COVID-19 is having important consequences on the development of the contemporary city, notably in the rethinking of public and collective spaces. To avoid contagion, restrictive measures and social distancing have been put in place: the two main consequences have been the digitalization of many sectors and the spread of tactical urbanism actions. In this paper, it will be argued that hyperlocal, understood as a collective and participatory design facilitated by information technology, can be a solution not only to the ongoing emergency but to the challenges that contemporary society poses, since it appears to be a valuable practice in rethinking and redesigning our neighborhoods and cities in a more open, inclusive, and therefore more resilient wa

Informationally complete measurements and groups representation

Informationally complete measurements on a quantum system allow to estimate the expectation value of any arbitrary operator by just averaging functions of the experimental outcomes. We show that such kind of measurements can be achieved through positive-operator valued measures (POVM's) related to unitary irreducible representations of a group on the Hilbert space of the system. With the help of frame theory we provide a constructive way to evaluate the data-processing function for arbitrary operators.Comment: 9 pages, no figures, IOP style. Some new references adde