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Topic: Quantum electronics


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In the News (Tue 22 Dec 09)

  
  Quantum dot - Wikipedia, the free encyclopedia
Quantum Dots are particularly significant for optical applications due to their high quantum yield.
Self-assembled quantum dots nucleate spontaneously under certain conditions during molecular beam epitaxy when a material is grown on a substrate to which it is not lattice matched.
To this end, Quantum Dots have quickly filled in the role, being found to be superior to traditional organic dyes on several counts, one of the most immediately obvious being brightness (owing to the high quantum yield) as well as their stability.
en.wikipedia.org /wiki/Quantum_dot   (1214 words)

  
 quantum theory -> Evolution of Quantum Theory on Encyclopedia.com 2002   (Site not responding. Last check: 2007-10-21)
Quantum mechanics, the final mathematical formulation of the quantum theory, was developed during the 1920s.
Quantum mechanics was combined with the theory of relativity in the formulation of P. Dirac (1928), which, in addition, predicted the existence of antiparticles.
Other developments of the theory include quantum statistics, presented in one form by Einstein and S. Bose (the Bose-Einstein statistics) and in another by Dirac and Enrico Fermi (the Fermi-Dirac statistics); quantum electrodynamics, concerned with interactions between charged particles and electromagnetic fields ; its generalization, quantum field theory ; and quantum electronics.
www.encyclopedia.com /html/section/quantumt_EvolutionofQuantumTheory.asp   (726 words)

  
 Electronics | TutorGig.co.uk Encyclopedia   (Site not responding. Last check: 2007-10-21)
Fuzzy electronics is an electronics electronic technology that uses fuzzy logic, instead of the two value logic more commonly used in digital electronics.
Consumer electronics is electronic equipment intended for use by everyday people.
Hypex Electronics is a Dutch electronics company, mostly known for its Electronic amplifier Class D Class D audio amplifier modules.
www.tutorgig.co.uk /encyclopedia/sencyclo.jsp?keywords=Electronics   (412 words)

  
 [No title]   (Site not responding. Last check: 2007-10-21)
Quantum nucleonics is the study for electromagnetic transitions in nuclei that is most analogous to quantum electronics for atoms.
Antennas emit radio waves, waveguide structures emit microwaves, electrons oscillating against the positive nuclei in atoms emit light and x rays, and protons and neutrons moving in the nuclei emit gamma rays.
In this case quantum mechanics is relentless and the two possibilities "interfere," so that the state which actually occurs in nature is a superposition of about equal parts of the proton metastable and the neutron metastable arrangement, with J = K = 8 and the energy of a pairing interaction.
www.utdallas.edu /research/quantum/Tutorial.htm   (4515 words)

  
 Research Demystifies Quantum Properties Of Exotic Materials
All strongly correlated materials contain electrons whose influence on one another is so pronounced that they cannot be explained by theoretical description of the independent electrons themselves but instead require an understanding of their dynamic interaction.
Electrons are a type of quantum particle called a “fermion.” Like all quantum particles, electrons can be considered both a particle and a wave, and quantum mechanics dictates that electron waves possess a definite momentum and that no two electrons can have the same momentum.
“Quantum critical points are of great current interest because of their ability to reach up from absolute zero and create a new state of matter called ‘quantum critical matter,'” said Coleman, professor of physics and astronomy at Rutgers and a member of the university's Center for Materials Theory.
www.sciencedaily.com /releases/2004/12/041219194949.htm   (1017 words)

  
 Quantum Computing - Department of Quantum Electronics Jena   (Site not responding. Last check: 2007-10-21)
It is known, that the resources of the semiconducting industry will be depleted in 10-20 years, when the physical sizes of transistors reach the atomic scales and the increasing of computer speed only by the size reduction becomes impossible.
When the external flux through the loop is equal to half of the flux quantum, this system has two quantum stable states with persistent circulating current of opposite sign.
Due to this tunelling process the total ground quantum state is splitted into neighbor levels separated by the tunelling slit.
www.ipht-jena.de /BEREICH_1/abt13_cryo_electronics/application-data/computing.html   (780 words)

  
 From solid state to quantum and molecular electronics, the deepening of information proceesing   (Site not responding. Last check: 2007-10-21)
Its electronic properties are so remarkable that "silicon" becomes equivalent with "integrated circuit" or "system chip", and an entire period of the electronics technology may be named "silicon electronics" or "silicon microelectronics".
An elementary quantum gate is a reversible gate, because it uses quantum phenomena respecting the reversible laws of quantum mechanics (Schrödinger equation).
For an isolated quantum system, that is not interacting with the environment, its evolution is governed by the Schrödinger equation (or by any other equivalent formalism of quantum mechanics), that is coherently and reversible, in a superposi-tional state.
www.racai.ro /~dragam/FromSolid.html   (5711 words)

  
 New era for quantum electronics (June 2001) - Physics World - PhysicsWeb
The miniaturization and increase in speed of electronic devices was one of the most spectacular achievements of 20th-century technology.
In conventional digital electronics, huge numbers of components can be integrated onto a chip by starting from a wafer made from a very pure silicon crystal.
The electrons and holes are kept apart by a strong electric field that is perpendicular to the wire, and thus they do not recombine.
physicsweb.org /articles/world/14/6/3/1   (1272 words)

  
 Optics, Photonics & Quantum Electronics
The “electronic super highway” of the Internet is actually an optical super highway.
At the extreme, the special laws of quantum mechanics set the limits and we are trying to understand these limits and at the same time make full use of the available physical possibilities.
Quantum physics phenomena are being described with increasingly advanced theoretical models.
www.it.kth.se /artikel/36/016001003/en   (221 words)

  
 Undergraduate Interest Area - Physical and Quantum Electronics
The tremendous advances in computers, calculators, digital watches, electronic ignitions, transistor radios, and lasers have been spurred by developments in the general area of Electrical Engineering known as "physical electronics." This area concerns itself with the development of the electronic devices that generate, detect, transmit, and amplify electrical energy and information.
Furthermore, advances in developing optical devices and an improved understanding of the underlying physical principles (quantum electronics and nonlinear optics) has led to reliable and increasingly sophisticated applications in optical communications, displays reprographics and medicine.
Certainly, the demand for professional competence in electronic device development and fabrication continues to grow with each passing year as the impact of new device technology is felt in the industrial and consumer marketplace.
www.ece.uiuc.edu /ugrad/physe.html   (365 words)

  
 Cyclic Mixture Mutagenesis \\ for DNA-Based Computing -- Molecular electronics & quantum electronics
"Quantum effects, thermal statistics and reliability of nanoscale molecular and semiconductor devices." Nanotechnology 2:73-87, 1991.
Scheme for binary logic using the spins of single electrons in quantum dots on a chip to store bits of information.
Builds a regular framework out of organic molecules that exhibits interesting electron magnetic phenomena that they speculate might be used in molecular electronic switches.
www.cise.ufl.edu /~mpf/DNAprop/bibmolelec.html   (178 words)

  
 COURSE TITLE: ECE D04: QUANTUM ELECTRONICS (1)
Topics include: axioms of quantum mechanics; operators; wavefunction; Schrodinger equation; the hydrogen atom; the harmonic oscillator, creation and annihilation operators; matrix formulation; perturbation theory; lattice vibrations and phonons; electromagnetic fields and their quantization, photons; interaction of radiation and atomic systems; spontaneous and induced transitions; Einstein coefficients; photon statistics.
Understand basic concepts of quantum mechanics, such as wave functions, uncertainty principle, etc., and their applicability to the description of electrical charges and electromagnetic fields.
Understand the principles of the “Old Quantum Mechanics,” and be able to use the WKB method to gain considerable insight into the form of the wavefunctions in arbitrary potential wells.
www.ece.northwestern.edu /courses/404.html   (445 words)

  
 School of Applied & Engineering Physics - College of Engineering - Cornell University
These research topics include photonics crystal structures that could allow for the development of optical "circuits" and of novel types of optical fiber that have unique capabilities not possible with current telecommunications fiber designs.
Semiconductor quantum "dots" are being investigated for potential development of highly broadband optical amplifiers and nonlinear optical switches.
The goal of this research is to increase the bandwidth of telecommunications systems and to develop "all-optical" systems that minimize electronic components.
www.aep.cornell.edu /eng10_page.cfm?webpageID=21   (469 words)

  
 Quantum Electronics: Theses
The operation of the MQB has been described as providing an increased barrier to electron overflow by reflecting high energy electrons trying to escape from the active region of the laser.
This thesis presents an investigation of the effects of the MQB as an electron reflector.
It is also proposed that the trapped zinc in the MQB region of the laser diode locally increases the p-type doping bringing the quasi-Fermi level for wholes closer to the valence band edge thus increasing the barrier to electron overflow in the conduction band.
www.ucc.ie /ucc/depts/elec/research/opto/thesis_abstracts.html   (716 words)

  
 Quantum Electronics and Photonics Group - Home Page   (Site not responding. Last check: 2007-10-21)
The Quantum Electronics Group was founded in 1972 to provide a forum for burgeoning interests in lasers and their applications, coupled with related areas such as nonlinear optics, photon statistics and coherent/quantum optical phenomena.
The remaining major division of the field of quantum electronics deals with the interactions of coherent light with matter and again leads to a wide range of all-optical and opto-electronic devices.
One of the most important activity of the Group is the series Quantum Electronics and Photonics(QEP) Conferences.
groups.iop.org /QE   (661 words)

  
 EETimes.com - Design for quantum computer proposed
SAN FRANCISCO — Work at IBM Corp. on the theory and practice of quantum computing suggests that the industry may be closer to practical CPUs that could process information in the form of quantum bits, or "qubits," rather than conventional binary bits.
Today, laboratory implementations of quantum devices concentrate on perhaps one or two of the seven requirements, he said, but to create commercial devices all seven must be met.
The quantum gate will most likely be switched with a voltage-controlled pulse at the gate, which superimposes a new state into the currently executing quantum algorithm.
www.eetimes.com /story/OEG20001211S0059   (1015 words)

  
 CQD: Publications
Razeghi and S. Slivken, “High Performance Quantum Cascade Laser Results at the Centre for Quantum Devices”, Physica Status Solidi, 195 (1), January 2003, as part of Proceedings of EXMATEC 2002 6th International Workshop on Expert Evaluation & Control of Compound Semiconductor Materials & Technologies, Budapest, Hungary, May 26-29, 2002, p.
Slivken and M. Razeghi, “Development of Quantum Cascade Lasers for High Peak Output Power and Low Threshold Current Density,” special ISDRS issue of Solid State Electronics Journal, 46, 2002, p.
“Quantum Photovoltaic Devices Based on Antimony Compound Semiconductors,” Y. Wei, A. Gin and M. Razeghi, submitted as Chapter in Mid-Infrared Optoelectronics, edited A. Krier, Springer-Verlag London Publishers, to be published 2005.
cqd.ece.northwestern.edu /pubs.html   (11599 words)

  
 Quantum computer and molecular electronics: two sides of the same coin
Quantum computer and molecular electronics: two sides of the same coin
Molecular electronics is an interdisciplinary field, more than the most other ones, because knowledge is required from biology, chemistry, computer science and physics.
Quantum-effect devices, which exploit the wave-like properties of electrons at the atomic level, are the subject of intense research at universities and corporate research institutes.
www.islandone.org /Foresight/Conferences/MNT05/Abstracts/Wei2abst.html   (903 words)

  
 IP8 Small Electronics and Quantum Chaos   (Site not responding. Last check: 2007-10-21)
The transport properties of electronic devices below the few-micrometer scale show signatures of quantum interference and quantum confinement when the devices are cooled near absolute zero.
This talk will summarize recent experiments measuring random (but perfectly repeatable) fluctuations in conductance of these structures - known as quantum dots - and the connection between the universal statistical properties of these fluctuations and the universal spectral statistics of random matrix theory and quantum manifestations of chaos.
This success story applies when the unavoidable coupling of electrons to the environment and each other is small.
www.siam.org /meetings/archives/ds97/ip8.htm   (164 words)

  
 Quantum Electronics 6.751
Following the implications of the Einstein model we move to a quantum mechanical description of an optical transition between two electronic states keeping a classical description of the electromagnetic field.
Next we read a classic paper by Lamb which is an elegant treatment of the laser but not the tour de force that Loudon presents later in his book.
We will see that electronic states are in fact mixtures of electronic and photon states; the so-called dressed states.
www.mit.edu /afs/athena/course/6/6.751/www   (516 words)

  
 State-of-the-Art Air Treatment Systems
Click here for Quantum's new info for those with questions or repair/retrofit and upgrade concerns.
he newest and most advanced development is Quantum's sensored units which remains in the standby mode, monitors the air quality, and only operates when there are impurities in the air.
This is an exclusive feature only available from Quantum and is by far one of most innovative feature ever offered for air treatment systems.
www.bilgebuster.com   (132 words)

  
 Quantum Electronics and Photonics Group - News Photon 04   (Site not responding. Last check: 2007-10-21)
This meeting is aimed at initiating a process of building a common language between the fields of Quantum Phase Transitions, Quantum Fluids and other forms and applications of novel Quantum Order.
All attendees are warmly invited to contribute a two-page abstract on a relevant theme.
In their presentations, contributors must clearly explain their research in the broader context of the field of optics to help non-specialists to understand the significance of their work.
groups.iop.org /QE/news_photon04.html   (356 words)

  
 Center for Spintronics and Quantum Computation
This multidisciplinary research center provides a focus for rapidly expanding research, education and training in spin-based electronics and quantum computation, with an emphasis on the potential realization in coherent electronic, magnetic and photonic nanostructures.
The Center brings together researchers from physics, materials science, electrical engineering, and computer science to address new paradigms for quantum electronics that rely on the electronic and photonic manipulation of quantum information in semiconductors.
Several of the projects are aimed at investigating the physics of quantum coherence and the engineering of quantum computation in semiconductors.
www.csqc.ucsb.edu   (166 words)

  
 Quantum Electronics Collaboration’s Nanotechnology Research Bolstered by Oxford Instruments Involvem
Quantum Electronics Collaboration’s Nanotechnology Research Bolstered by Oxford Instruments Involvement
This will enable extremely low temperature environments, essential for research into quantum electronics, quantum computing and quantum nanotechnology.
The overall aim of the collaboration, which is headed by Professor Briggs of Oxford University, is to provide the technological infrastructure that will give scientists and industries a head start in the development of new kinds of nanotechnology and its commercial exploitation.
www.azom.com /details.asp?ArticleID=1972   (294 words)

  
 DIP Meeting on Quantum Electronics   (Site not responding. Last check: 2007-10-21)
Quantum interferometry with electrons: interplay between spin and interactions
The quantum Hall plateau transition: universal scaling and conductance fluctuations
Electron correlation effects in the N = 2 Landau Level
www.bgu.ac.il /~yshai03/dipprogram.html   (62 words)

  
 ECE 746: Quantum Electronics   (Site not responding. Last check: 2007-10-21)
Elementary aspects of Lagrange theory of fields and field quantization; Bose, Fermi and Pauli operators; interaction of fields; quantum theory of damping and fluctuations; applications to lasers, nonlinear optics, and quantum optics.
The course is intended for students from ECE, MS&E, and physics with an interest in quantum mechanics and its application to semiconductors.
Current research in the fields of quantum computing, nano-electromechanical systems, nanotubes and others will be reviewed.
www.engr.wisc.edu /ece/courses/ece746.html   (157 words)

  
 R   (Site not responding. Last check: 2007-10-21)
Although the University of Notre Dame Libraries are committed to providing electronic access to its patrons, due to changes in policies by the vendors, we sometimes have to withdraw online access to some of our journals.
Since the Internet is a dynamic environment, and one that we do not have local control of, please let us know if one of the following links does not go to the journal specified (e.g., if the system prompts you for a password, or if the home page of the journal has changed).
Please see the Electronic Journal Use Policy for permited uses.
chemistry.library.nd.edu /resources/Web_Journals/r.shtml   (159 words)

  
 The UTD Center for Quantum Electronics   (Site not responding. Last check: 2007-10-21)
Founded in 1975, the Center for Quantum Electronics at UTD serves as one of the premier institutions for laser- related research and teaching in the Southwest.
Current research in the Center for Quantum Electronics is focused upon three areas:
Collins Director, Center for Quantum Electronics, MS/NB1.1 University of Texas at Dallas P.O. Box 830688 Richardson, TX 75083-0688
www.utdallas.edu /research/quantum   (122 words)

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