Quanta 

About: Quanta is an academic journal published by Quanta. The journal publishes majorly in the area(s): Quantum & Quantum entanglement. It has an ISSN identifier of 1314-7374. It is also open access. Over the lifetime, 88 publications have been published receiving 1253 citations. The journal is also known as: Quanta (Varna) & Quanta (Pleven).

Is the Quantum State Real? An Extended Review of ψ-ontology Theorems

Abstract: Towards the end of 2011, Pusey, Barrett and Rudolph derived a theorem that aimed to show that the quantum state must be ontic (a state of reality) in a broad class of realist approaches to quantum theory. This result attracted a lot of attention and controversy. The aim of this review article is to review the background to the Pusey–Barrett–Rudolph Theorem, to provide a clear presentation of the theorem itself, and to review related work that has appeared since the publication of the Pusey–Barrett–Rudolph paper. In particular, this review: Explains what it means for the quantum state to be ontic or epistemic (a state of knowledge); Reviews arguments for and against an ontic interpretation of the quantum state as they existed prior to the Pusey–Barrett–Rudolph Theorem; Explains why proving the reality of the quantum state is a very strong constraint on realist theories in that it would imply many of the known no-go theorems, such as Bell's Theorem and the need for an exponentially large ontic state space; Provides a comprehensive presentation of the Pusey–Barrett–Rudolph Theorem itself, along with subsequent improvements and criticisms of its assumptions; Reviews two other arguments for the reality of the quantum state: the first due to Hardy and the second due to Colbeck and Renner, and explains why their assumptions are less compelling than those of the Pusey–Barrett–Rudolph Theorem; Reviews subsequent work aimed at ruling out stronger notions of what it means for the quantum state to be epistemic and points out open questions in this area. The overall aim is not only to provide the background needed for the novice in this area to understand the current status, but also to discuss often overlooked subtleties that should be of interest to the experts. Quanta 2014; 3: 67–155.

Introduction to Weak Measurements and Weak Values

Abstract: We present a short review of the theory of weak measurement. This should serve as a map for the theory and an easy way to get familiar with the main results, problems and paradoxes raised by the theory. Quanta 2013; 2: 7–17.

Quantum Cryptography: Key Distribution and Beyond

Abstract: Uniquely among the sciences, quantum cryptography has driven both foundational research as well as practical real-life applications. We review the progress of quantum cryptography in the last decade, covering quantum key distribution and other applications. Quanta 2017; 6: 1–47.

Pedagogical Review of Quantum Measurement Theory with an Emphasis on Weak Measurements

Abstract: The quantum theory of measurement has been with us since quantum mechanics was invented. It has recently been invigorated, partly due to the increasing interest in quantum information science. In this partly pedagogical review I attempt to give a self-contained overview of non-relativistic quantum theory of measurement expressed in density matrix formalism. I will not dwell on the applications in quantum information theory; it is well covered by several books in that field. The focus is instead on applications to the theory of weak measurement, as developed by Aharonov and collaborators. Their development of weak measurement combined with what they call post-selection - judiciously choosing not only the initial state of a system ( pre-selection ) but also its final state - has received much attention recently. Not the least has it opened up new, fruitful experimental vistas, like novel approaches to amplification. But the approach has also attached to it some air of mystery. I will attempt to demystify it by showing that (almost) all results can be derived in a straight-forward way from conventional quantum mechanics. Among other things, I develop the formalism not only to first order but also to second order in the weak interaction responsible for the measurement. I apply it to the so called Leggett-Garg inequalities, also known as Bell inequalities in time . I also give an outline, even if rough, of some of the ingenious experiments that the work by Aharonov and collaborators has inspired. As an application of weak measurement, not related to the approach by Aharonov and collaborators, the formalism also allows me to derive the master equation for the density matrix of an open system in interaction with an environment. An issue that remains in the weak measurement plus post-selection approach is the interpretation of the so called weak value of an observable. Is it a bona fide property of the system considered? I have no definite answer to this question; I shall only exhibit the consequences of the proposed interpretation. Quanta 2013; 2: 18–49.

Metode penelitian deskriptif kualitatif dalam perspektif bimbingan dan konseling

Abstract: Jenis penelitian deskriptif kualitatif (QD) umumnya dipakai dalam fenomenologi sosial. Salah satu penelitian sosial adalah penelitian bimbingan dan konseling. Penelitian deskriptif kualitatif dalam perspektif bimbingan dan konseling dapat diartikan penelitian dalam bidang bimbingan dan konseling yang tujuannya untuk menyajikan gambaran detail mengenai setting proses bimbingan atau konseling di sekolah dimaksudkan untuk eksplorasi bagaimana suatu bimbingan atau konseling terjadi, apakah bimbingan atau konseling yang telah dilakukan dapat sejalan untuk mengatasi sejumlah variabel yang berkenaan dengan masalah diteliti. Analisis data dalam penelitian kualitatif dilakukan sejak sebelum memasuki lapangan, selama di lapangan, dan setelah selesai di lapangan. Langkah langkah analisis data kualitatif meliputi reduksi data, display dan penarikan kesimpulan. Kekuatan penelitian kualitatif paling utama terletak dari fleksibilitas dari gaya peneliti untuk mendekripsikan alur penelitian dengan masalah penelitian yang sangat terbuka. Sedangkan kelemahan penelitian kualitatif terletak dari seberapa cermat peneliti menangkap momen ataupun data yang penting pada saat penelitian terjadi. Kata Kunci : Deskriptif kualitatif (QD), Bimbingan dan Konseling.