Quantum theory

Boyle, Joe
May 2004
Engineer (00137758);5/1/2004, Vol. 293 Issue 7651, p11
Reports on Purdue University researchers' development of a transistor using "designer" atoms, known as quantum dots, which could pave the way for computers millions of times more powerful than those in use today. Development of quantum computers using components manufactured from "designer' atoms; Key features of the quantum dots; Significance of the research.


Related Articles

  • Hitachi researchers make quantum leap. Saran, Cliff // Computer Weekly;8/30/2005, p17 

    The article reports that a team of researchers at Hitachi-Cambridge has developed a silicon device to facilitate quantum computing. The device, known as a quantum-dot charge qubit, is based on years of work on single electronics. Hitachi said the breakthrough represents the first step in the...

  • Controlling Sudden Birth and Sudden Death of Entanglement at Finite Temperature. Chuan-Jia Shan; Tao Chen; Ji-Bing Liu; Wei-Wen Cheng; Tang-Kun Liu; Yan-Xia Huang; Hong Li // International Journal of Theoretical Physics;Apr2010, Vol. 49 Issue 4, p717 

    The decoherence and the decay of quantum entanglement due to both population relaxation and thermal effects are investigated for the two qubits initially prepared in the extended Werner-like state by solving the Lindblad form of the master equation, where each qubit is interacting with an...

  • A gallium nitride single-photon source operating at 200 K. Kako, Satoshi; Santori, Charles; Hoshino, Katsuyuki; Götzinger, Stephan; Yamamoto, Yoshihisa; Arakawa, Yasuhiko // Nature Materials;Nov2006, Vol. 5 Issue 11, p887 

    Fundamentally secure quantum cryptography has still not seen widespread application owing to the difficulty of generating single photons on demand. Semiconductor quantum-dot structures have recently shown great promise as practical single-photon sources, and devices with integrated optical...

  • Quantum Information Processing: Bridge between two lengthscales. Côté, Robin // Nature Physics;Sep2006, Vol. 2 Issue 9, p583 

    The article features a study on the quantum information processing in computational devices. A quantum computer can perform more efficiently than a conventional one. However, this would require high performance qubits that can hold more than two values. This property is now available in quantum...

  • State Tomography of Layered Qubits via Spin Blockade Measurements on the Edge Qubit in a Spin Field-Effect Transistor Structure Embedded with Quantum Dots. Yuasa, K.; Okano, K.; Nakazato, H.; Kashiwada, S.; Yoh, K. // AIP Conference Proceedings;2007, Vol. 893 Issue 1, p1109 

    As a promising physical realization of a quantum computer, we discuss a system with stacked quantum dots buried in adjacent to the channel of a spin field-effect transistor. In this scheme, one can measure only the edge qubit (nearest to the channel) via the spin-blockade measurement, but still...

  • Mesoporous matrices for quantum computation with improved response through redundance. Hodgson, T. E.; Bertino, M. F.; Leventis, N.; D’Amico, I. // Journal of Applied Physics;6/1/2007, Vol. 101 Issue 11, p114319 

    We present a solid state implementation of quantum computation, which improves previously proposed optically driven schemes. Our proposal is based on vertical arrays of quantum dots embedded in a mesoporous material which can be fabricated with present technology. The redundant encoding typical...

  • Semiconductor Quantum Dots Take First Steps Toward Spin-Based Quantum Computation. Day, Charles // Physics Today;Mar2006, Vol. 59 Issue 3, p16 

    The article provides information on semiconductor quantum dots. Of the obstacles to building a quantum computer, scaling up from a few-qubit logic gate to a many-qubit device and sustaining the qubits' coherence long enough to do a worthwhile and accurate calculation remain especially tough to...

  • Controlling Spin Qubits in Quantum Dots. Engel, Hans-Andreas; Kouwenhoven, L. P.; Loss, Daniel; Marcus, C. M. // Quantum Information Processing;Oct2004, Vol. 3 Issue 1-5, p115 

    We review progress on the spintronics proposal for quantum computing where the quantum bits (qubits) are implemented with electron spins. We calculate the exchange interaction of coupled quantum dots and present experiments, where the exchange coupling is measured via transport. Then,...

  • Optically Driven Quantum Computing Devices Based on Semiconductor Quantum Dots. Xiaoqin Li; Steel, Duncan; Gammon, Daniel; Sham, L. J. // Quantum Information Processing;Oct2004, Vol. 3 Issue 1-5, p147 

    This paper concerns optically driven quantum logic devices based on semiconductor quantum dots. It provides a brief review of recent theoretical and experimental progress towards building such devices and a description of a possible direction of further research. We consider both the exciton and...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics