Out-of-time-ordered measurements as a probe of quantum dynamics

Probing the out-of-equilibrium dynamics of quantum matter has gained renewed interest owing to immense experimental progress in artifcial quantum systems. Dynamical quantum measures such as the growth of entanglement entropy (EE) and out-of-time ordered correlators (OTOCs) have been shown, theoretically, to provide great insight by exposing subtle quantum features invisible to traditional measures such as mass transport. However, measuring them in experiments requires either identical copies of the system, an ancilla qubit coupled to the whole system, or many measurements on a single copy, thereby making scalability extremely complex and hence, severely limiting their potential. Here, we introduce an alternate quantity $-$ the out-of-time-ordered measurement (OTOM) $-$ which involves measuring a single observable on a single copy of the system, while retaining the distinctive features of the OTOCs. We show, theoretically, that OTOMs are closely related to OTOCs in a doubled system with the same quantum statistical properties as the original system. Using exact diagonalization, we numerically simulate classical mass transport, as well as quantum dynamics through computations of the OTOC, the OTOM, and the EE in quantum spin chain models in various interesting regimes (including chaotic and many-body localized systems). Our results demonstrate that an OTOM can successfully reveal subtle aspects of quantum dynamics hidden to classical measures, and crucially, provide experimental access to them.Comment: 7 pages, 4 figure

Enriching Interactional Space Nonverbally: Microanalysis of Teachers’ Performance in JFL Classrooms

This study examines JFL classroom discourse data qualitatively in order to investigate how the instructors and learners in the classroom project their talk as publically shared to obtain "transparency of understanding" (LeBaron and Koschmann 2003) among each other. The data set for this study contains approximately 450 minutes of JFL classes at several universities in North America. Four different teachers participated in this recording, and all the data were video-recorded. Applying conversation analysis with a multi-modal microanalytic perspective to examine the data set, it portrays the interconnection among verbal (e.g., turn design and manner of delivery of the turns) and nonverbal embodiments (particularly the use of body emplacements and gestures). This paper captures the moment-to-moment development of the instructors\u27 actions in order to delineate the ways by which their talk, even when it was initially addressing a focal student, is eventually made accessible to all the participants present in the classroom. In a foreign language context like the classrooms examined in this study, the limited interactional opportunity is an unsolved challenge. This study claims that the instructors\u27 actions can make a difference in increasing the interactional encounters

Zengin ve mesut Berar Prensesi Dürrüşehvar

Taha Toros Arşivi, Dosya Adı: Son Halife Abdülmecit Efend

The use of the fly ash for hydraulically bound mixtures

The aim of my diploma paper is to evaluate the influence of amount of fly ash to the strength of the hydraulically bound mixtures. It is well known that the calcareous fly ashes express hydraulic and pozzolanic properties and can be used as hydraulic binder instead of cement for hydraulically bound mixtures for roads and other trafficked areas. Fly ashes are fine powder produced as by-products by\ud the combustion of pulverized coal or lignite in energy generating plants and captured by mechanical or electrostatic precipitators. Its use as a binder is welcome from the environmental and economical point of view.\ud With the laboratory investigation we tried to find out how the amount of the added fly ash influences to the strength of the hydraulically bound dolomite aggregate. Our special attention was paid to the investigation with which we try to define, how different ways of ageing and maintenance of samples during ageing influence to the mechanical characteristics of laboratory mixtures

Spartan Daily, January 20, 1954

Volume 42, Issue 68https://scholarworks.sjsu.edu/spartandaily/11963/thumbnail.jp

19 yıl önce kazandığımız büyük zafer:dört gündür devam eden kanlı muharebeler Türk kılıcının üstünlüğüyle sona eriyordu

Taha Toros Arşivi, Dosya Adı: Milli Mücadele. Not: Gazetenin "Yakın Tarihten" köşesinde yayımlanmıştır.Unutma İstanbul projesi İstanbul Kalkınma Ajansı'nın 2016 yılı "Yenilikçi ve Yaratıcı İstanbul Mali Destek Programı" kapsamında desteklenmiştir. Proje No: TR10/16/YNY/010

Investment in New Activities and the Welfare Cost of Uncertainty

Recent literature has highlighted the importance of new activities in development and growth. It was shown that trade distortions such as tariffs are associated with first-order costs stemming from the induced drop in the formation of new activities. This paper demonstrates that uncertainty may induce similar costs. This argument is illustrated in the context of Romer's model of a dependent economy, where foreign direct investment is needed to enable the importation of capital goods and intermediate products used in domestic production. The present paper shows that uncertainty acts as an implicit tax on new activities, whose incidence is (in a certain sense) worse than that of a tariff in Romer's framework. As with a tariff, uncertainty inhibits the formation of new activities. Unlike the tariff, however, uncertainty does not benefit the government with revenue. The welfare cost of uncertainty applies also for a closed economy. The paper shows that uncertainty-averse entrepreneurs discount using a 'hurdle rate' that exceeds the risk-free interest rate. The gap between the two rates increases with the uncertainty embodied in the investment, being determined by the vagueness of the information and by the range of possible outcomes. Hence, growth may be inhibited by business uncertainty, where the 'rules of the game' for new activities are vague.