New Quantum Exchange collection resources
http://www.thequantumexchange.org/
The latest material additions to the Quantum Exchange.en-USCopyright 2015, ComPADRE.orgeditor@thequantumexchange.orgeditor@thequantumexchange.orgSat, 21 Nov 2015 09:47:04 ESThttp://blogs.law.harvard.edu/tech/rsshttp://www.compadre.org/portal/services/images/LogoSmallQuantum.gifQuantum Exchange
http://www.thequantumexchange.org/
12535SEI: Modern Physics - Quantum Learning Goals
http://www.thequantumexchange.org/items/detail.cfm?ID=13265
This page provides a list of learning goals for a PER-based Modern Physics Course. It includes expectations for student understanding of both specific topics and general concepts in quantum physics.
This is part of a resource collection covering an entire course.Quantum Physics/Generalhttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13265Sat, 21 Nov 2015 09:47:04 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13265Circular Well Model
http://www.thequantumexchange.org/items/detail.cfm?ID=9639
The Circular Well model displays the 2D energy eigenstates of a particle trapped in a very deep two-dimensional circular well. Because the Schrödinger equation for this system is separable into radial and angular differential equations, the solution can be expressed as a product of a Bessel function and and a complex exponential.
The Circular Well model is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_qm_CircularWell.jar file will run the program if Java is installed. You can modify this simulation if you have EJS installed by right-clicking within the plot and selecting “Open EJS Model” from the pop-up menu item.Quantum Physics/Bound State Systemshttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=9639Sat, 21 Nov 2015 09:46:24 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=9639Developing and Assessing Research-Based Tools for Teaching Quantum Mechanics and Thermodynamics
http://www.thequantumexchange.org/items/detail.cfm?ID=13786
Research-based tools to educate college students in physics courses from introductory level to graduate level are essential for helping students with a diverse set of goals and backgrounds learn physics. This thesis explores issues related to student common difficulties with some topics in undergraduate quantum mechanics and thermodynamics courses. Student difficulties in learning quantum mechanics and thermodynamics are investigated by administering written tests and surveys to many classes and conducting individual interviews with a subset of students outside the class to unpack the cognitive mechanisms of the difficulties. The quantum mechanics research also focuses on using the research on student difficulties for the development and evaluation of a Quantum Interactive Learning Tutorial (QuILT) to help students learn about the time-dependence of expectation values using the context of Larmor precession of spin and evaluating the role of asking students to self-diagnose their mistakes on midterm examination on their performance on subsequent problem solving. The QuILT on Larmor precession of spin has both paper-pencil activities and a simulation component to help students learn these foundational issues in quantum mechanics. Preliminary evaluations suggest that the QuILT, which strives to help students build a robust knowledge structure of time-dependence of expectation values in quantum mechanics using a guided approach, is successful in helping students learn these topics in the junior-senior level quantum mechanics courses. The technique to help upper-level students in quantum mechanics courses effectively engage in the process of learning from their mistakes is also found to be effective. In particular, research shows that the self-diagnosis activity in upper-level quantum mechanics significantly helps students who are struggling and this activity can reduce the gap between the high and low achieving students on subsequent problem solving. Finally, a survey oEducation Practices/Instructional Material Design/Tutorialhttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13786Sat, 21 Nov 2015 09:43:51 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13786Investigating Student Difficulties with Dirac Notation
http://www.thequantumexchange.org/items/detail.cfm?ID=13149
Quantum mechanics is challenging even for advanced undergraduate and graduate students. Dirac notation is a convenient notation used extensively in quantum mechanics. We have been investigating the difficulties that the advanced undergraduate and graduate students have with Dirac notation. We administered written free response and multiple-choice questions to students and also conducted semi-structured individual interviews with 23 students using a think-aloud protocol to obtain a better understanding of the rationale behind their responses. We find that many students struggle with Dirac notation and they are not consistent in using this notation across various questions in a given test. In particular, whether they answer questions involving Dirac notation correctly or not is context dependent.Quantum Physics/Foundations and Measurements/Hilbert Spacehttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13149Sat, 21 Nov 2015 09:42:40 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13149PER-Based Tutorials for Quantum Physics
http://www.thequantumexchange.org/items/detail.cfm?ID=13266
This series of student tutorials for quantum physics, covering topics of wave properties of light and matter, probability, and wave functions. Included with some of the tutorials are pre-tests for the topic and related homework.
This material is based on the work on Intuitive Quantum Physics from the University of Maryland, and tutorials developed at the University of WashingtonQuantum Physics/Probability, Waves, and Interferencehttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13266Sat, 21 Nov 2015 09:39:42 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13266Low-Cost Coincidence Counting Apparatus For Single Photon Optics Investigations
http://www.thequantumexchange.org/items/detail.cfm?ID=13806
We have recently started investigating single photon experiments for our advanced laboratory and quantum mechanics classes. For a small department, the expenses of much of the apparatus is daunting. As such, we look for places where we can reduce the costs while still providing benefits for our students. One of the places where there can be some cost savings are in the coincidence counting unit. The coincidence counting unit is a critical piece of the investigation, and while not the most expensive component, cost savings are still available. We have developed a low-cost coincidence counter (less than $50) based on a Cypress Programmable System on a Chip (PSoC). The PSoC is quite flexible and has both microcontroller as well as FPGA like capabilities which enable us to build the coincidence detection and the counter. The design process and several investigations will be presented.Quantum Physics/Quantum Experimentshttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13806Sat, 21 Nov 2015 09:38:09 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13806Advanced Laboratory Physics Association
http://www.thequantumexchange.org/items/detail.cfm?ID=13624
The Advanced Laboratory Physics Association (ALPhA) is an association of college and university faculty and staff dedicated to advanced experimental physics instruction. ALPhA works with other professional organizations, including the American Association of Physics Teachers (AAPT), the American Physical Society (APS), and the Optical Society of America (OSA), to advance laboratory instruction.
ALPhA's efforts include annual Laboratory Immersions Programs to help advanced laboratory instructors learn new labs, organizing conferences on advanced laboratories, and ALPhA’s relatively inexpensive Single Photon Detector Initiative.General Physics/Collections/Advanced Laboratorieshttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13624Sat, 21 Nov 2015 08:27:13 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13624Witnessing Entanglement
http://www.thequantumexchange.org/items/detail.cfm?ID=13795
An entangled state of a two-particle system is a quantum state that cannot be separated—it cannot be written as the product of states of the individual particles. One way to tell if a system is entangled is to use it to violate a Bell inequality (such as the Clauser-Horne-Shimony-Holt, CHSH, inequality), because entanglement is necessary to violate these inequalities. However, there are other, more efficient measurements that determine whether or not a system is entangled; an operator that corresponds to such a measurement is referred to as an entanglement witness. We present the theory of witness operators, and an undergraduate experiment that measures an entanglement witness for the joint polarization state of two photons. We are able to produce states for which the expectation value of the witness operator is entangled by more than 160 standard deviations.Quantum Physics/Entanglement and Quantum Informationhttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13795Thu, 19 Nov 2015 17:11:30 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13795The Quantum Mechanics of Two and Three Dimensional Nano-Structures
http://www.thequantumexchange.org/items/detail.cfm?ID=8662
Nano-science is one of the fastest growing fields in both physics and engineering. It is now possible to design and fabricate devices whose physical dimensions are on the nanometer scale and whose quantum properties can be tuned as desired. In this notebook we will study the quantum mechanics of what are known as reduced dimensional structures. A structure is said to have reduced dimensionality if one or more of the dimensions is on the order of the De Broglie wavelength of the particles confined to the structure. An ordinary wire for example, has no reduced dimensionality since both its length and its radius are large compared to the De Broglie wavelength of room temperature electrons.Quantum Physics/Bound State Systemshttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=8662Tue, 25 Aug 2015 10:49:04 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=8662Paradigms in Physics: Quantum Mechanics Activities
http://www.thequantumexchange.org/items/detail.cfm?ID=13622
This web page provides a list of learning activities for Junior level Quantum Mechanics classes. Each activity includes a description and learning goals, guides for instructors, handouts or worksheets, and reflections of instructors who have used the activity when available. Among the topics included are operators, time dependence, spin systems, and angular momentum. Links to related mathematical concepts are also provided.
This material is part of the Paradigms in Physics project at Oregon State University. This work promotes the use of active student learning in upper division physics courses. Both learning materials and learning strategies are provided to help both students and instructors.Quantum Physics/Generalhttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13622Wed, 24 Jun 2015 07:46:16 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13622Paradigms in Physics: Linear Combinations of Spherical Harmonics
http://www.thequantumexchange.org/items/detail.cfm?ID=13597
This computer visualization activity is designed to help upper division undergraduate students visualize linear combinations of spherical harmonics. Students use a Maple worksheet or Mathematica notebook to visualize various representations of probability densities of linear combinations of spherical harmonics. The entire class wrap-up discussion addresses how to represent linear combinations of spherical harmonics in a variety of ways.
This material is part of the Paradigms in Physics project at Oregon State University. This work promotes the use of active student learning in upper division physics courses. Both learning materials and learning strategies are provided to help both students and instructors.Mathematical Tools/Series and Functions/Spherical Harmonicshttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13597Mon, 22 Jun 2015 15:26:55 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13597Paradigms in Physics: Finding the Coefficients of a Spherical Harmonic Series
http://www.thequantumexchange.org/items/detail.cfm?ID=13598
This small group activity is designed to help upper division undergraduate students learn how to expand functions in terms of spherical harmonics. Students work in small groups to find the coefficients of a given function expanded in spherical harmonics. The whole class wrap-up discussion includes group presentations focusing on the notion that any function on the unit sphere can be expanded in terms of the orthonormal set of spherical harmonics.
This material is part of the Paradigms in Physics project at Oregon State University. This work promotes the use of active student learning in upper division physics courses. Both learning materials and learning strategies are provided to help both students and instructors.Mathematical Tools/Series and Functions/Spherical Harmonicshttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13598Mon, 22 Jun 2015 15:21:55 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13598QuILT Beta
http://www.thequantumexchange.org/items/detail.cfm?ID=13514
The QuILT Beta web site is a collection of pedagogical resources and activities for an upper-level undergraduate course in Quantum Mechanics. The materials include a series of concept tests covering all standard topics in the course and a series of interactive tutorials for active student learning. Several of the tutorials are combined with interactive simulations that promote student exploration. Pre- and Post-Tests, homework problems, and a concept survey are also included.Quantum Physics/Generalhttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13514Wed, 29 Apr 2015 18:33:44 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13514Developing a quantum mechanics concept inventory
http://www.thequantumexchange.org/items/detail.cfm?ID=13413
This paper describes the process of writing a quantum mechanics concept inventory concerning one-dimensional potential barriers, tunneling and probability distributions. It also explores some of the related alternative conceptions, and presents the results of 216 inventory questionnaires distributed to four groups of students.
One main result is that the question context is important for the models used when answering. The survey results show the alternative conceptions of energy loss due to tunneling and the view of a probability density peak as an indivisible entity are quite common (about 40 and 30 percent of the students, respectively).Quantum Physics/Probability, Waves, and Interferencehttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13413Mon, 23 Mar 2015 21:48:46 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13413Physlets Quantum Physics
http://www.thequantumexchange.org/items/detail.cfm?ID=13362
Physlet Quantum Physics 2E contains a collection of exercises about concepts from modern and quantum physics, facilitated by computer animations. Topics include special relativity, quantum experiments, quantum theory, and applications. Chapters are divided into Illustrations, Explorations, and Problems.
Illustrations are designed to demonstrate physical concepts. They are suitable for reading assignments prior to class and classroom demonstrations. Explorations are tutorial in nature. They provide hints or suggest problem-solving strategies to students in working problems and are useful as Just-in-Time Teaching exercises. Problems are interactive versions of the kind of exercises typically assigned for homework. They require the students to demonstrate their understanding, such as in homework assignments.Quantum Physics/Generalhttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13362Sat, 15 Nov 2014 00:59:54 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13362Tutorials in Physics: Quantum Mechanics
http://www.thequantumexchange.org/items/detail.cfm?ID=13267
This web site provides access to a set of student tutorials designed to supplement lectures and textbooks through in quantum mechanics. The tutorials are most suitable for courses in which there is an opportunity for students to work together in small groups; however, they can also be adapted for use in large, lecture hall settings. Carefully sequenced exercises and questions engage students in the type of active intellectual involvement that is necessary for developing a functional understanding of physics.
The website contains resources for instructors, including sample pretests, post-tests examination questions, suggestions for preparing Teaching Assistants, as well as details about the individual tutorials. Quantum Physics/Generalhttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=13267Fri, 06 Jun 2014 17:07:58 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=13267SEI: Modern Physics Course Materials
http://www.thequantumexchange.org/items/detail.cfm?ID=4937
This website contains lectures, homework, exams, and other materials for a PER-based large lecture modern physics course for engineering majors. This course has redesigned content and learning techniques focused on topics more useful to engineering majors than a traditional modern physics course. The course emphasizes reasoning development, model building, and connections to real world applications. A variety of PER-based learning resources, including peer instruction, collaborative homework sessions, and interactive simulations, are used. Research results on learning outcomes from the course are included.Modern Physics/Generalhttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=4937Thu, 05 Jun 2014 09:07:01 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=4937Exploring Student Understanding of Energy through the Quantum Mechanics Conceptual Survey
http://www.thequantumexchange.org/items/detail.cfm?ID=8916
We present a study of student understanding of energy in quantum mechanical tunneling and barrier penetration. This paper will focus on student responses to two questions that were part of a test given in class to two modern physics classes and in individual interviews with 17 students. The test, which we refer to as the Quantum Mechanics Conceptual Survey (QMCS), is being developed to measure student understanding of basic concepts in quantum mechanics. In this paper we explore and clarify the previously reported misconception that reflection from a barrier is due to particles having a range of energies rather than wave properties. We also confirm previous studies reporting the student misconception that energy is lost in tunneling, and report a misconception not previously reported, that potential energy diagrams shown in tunneling problems do not represent the potential energy of the particle itself. The present work is part of a much larger study of student understanding of quantum mechanics.Quantum Physics/Scattering and Continuum State Systems/Transmission and Reflectionhttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=8916Wed, 09 Apr 2014 21:28:17 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=8916Photoelectric Effect Model
http://www.thequantumexchange.org/items/detail.cfm?ID=10272
The EJS Photoelectric Effect model simulates the Photoelectric effect discovered by Hertz in 1887 and described theoretically by Einstein in 1905. Light of a given frequency (energy) shines on a metal in a vacuum tube. If the energy of the photons is greater than the work function of the metal, W, electrons are ejected and can form a current in an external circuit. These photoelectrons will have a kinetic energy if the energy of the light is greater than the work function. If subjected to an electric potential between the plates in the tube, the electrons excited from the metal will be accelerated resulting in an increase, decrease, or stopping of the current. This model provides controls for the frequency of the light source and the external potential on the electron tube. An ammeter allows users to take data for the photo-current.
The EJS Photoelectric Effect model was created using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_qm_photoelectric.jar file will run the program if Java is installed.Quantum Physics/Quantum Experimentshttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=10272Wed, 09 Apr 2014 21:01:41 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=10272The Transactional Interpretation of Quantum Mechanics
http://www.thequantumexchange.org/items/detail.cfm?ID=1940
This article introduces the interpretation of the formalism of quantum mechanics, the Transactional Interpretation (TI) which addresses some issues raised by recent tests of Bell's inequalities. TI is non-local, relativistically invariant, and fully causal. A detailed comparison is made with the Copenhagen interpretation. Also, there is a link providing articles that have cited this one.Quantum Physics/Foundations and Measurementshttp://www.thequantumexchange.org/bulletinboard/Thread.cfm?ID=1940Fri, 08 Nov 2013 09:30:39 ESThttp://www.thequantumexchange.org/items/detail.cfm?ID=1940