Quantum Computing Breakthrough


An earlier series of articles on quantum computing discussed the differences between the gate logic model and the quantum annealing model. The gate logic model, like transistor logic, uses a limited number of “gates” to construct a general purpose computer, theoretically capable of solving any problem for which a suitable algorithm can be found. In systems designed around the gate logic mod... » read more

System Bits: March 17


Symmetry in graphene growth According to Rice University researchers, what lies beneath growing islands of graphene is important to its properties. The team analyzed patterns of graphene – a single-atom-thick sheet of carbon – grown in a furnace via chemical vapor deposition and discovered that the geometric relationship between graphene and the substrate, the underlying material on whi... » read more

How To Program A Quantum Computer


Quantum computers have captured the attention of the computer science world because they are faster than classical computers for some problems. Spend any time reading about quantum computing technology, and you’ll see that statement over and over again. But what does it actually mean, given that classical computing is a mature, highly optimized technology and quantum computers are in their in... » read more

Reading About Quantum Computing


For the last several months, I’ve been working on a series of articles about quantum computing: how quantum computers are different from conventional computers, what materials systems might be appropriate for use in qubits, and, for the upcoming last article, how one might actually build and program a quantum computer. Some of the subtopics are familiar ground for me, and probably for most... » read more

Not All Qubits Are Small


While diamond nitrogen-vacancy centers offer one attractive implementation of quantum qubits, many other systems have been proposed. In theory, at least, any system with clearly identifiable quantum states can serve the purpose. The challenge lies in finding a system in which those states can be manipulated and measured by external forces and can be fabricated in large enough numbers for practi... » read more

More To Quantum Computing Than Qubits


A couple of weeks ago, I posted an article about qubits based on the nitrogen-vacancy (N-V) center in diamond. I’m working on one about qubits based on superconducting loops with Josephson junctions. But it’s important to remember that the qubit technology alone tells only part of the story of a quantum computer. Quantum computers, like conventional computers, need ways to store data and wa... » read more

System Bits: April 29


Beyond graphene Researchers at The University of Manchester have shown how they can control the properties of stacks of 2D materials, opening up the potential for new, previously-unimagined electronic devices. The isolation of graphene at the University in 2004 led to the discovery of many other 2D crystals and while graphene has an unrivaled set of superlatives, these crystals cover a larg... » read more

Introduction To Quantum Computing


Quantum computing has attracted a lot of attention lately. Recent revelations about the extent of the U.S. National Security Agency’s data collection programs, along with several large-scale corporate data breaches, have called attention to the need for secure communications. Quantum computing has potentially far-reaching implications for data security, both reducing the effectiveness of conv... » read more

System Bits: April 8


Quantum photon properties revealed in plasmon particle For years, researchers have been interested in developing quantum computers—the theoretical next generation of technology that will outperform conventional computers that involves storing information in qubits rather than in bits used by computers today. One approach for computing with qubits relies on the creation of two single photons ... » read more

Quantum Computer Race Heats Up


For years, there has been an intense race among various nations to develop the world’s fastest supercomputers. The U.S. and Japan led the field until 2010, when China stunned the market and rolled out the world’s fastest supercomputer. And today, China continues to lead the field with a supercomputer capable of running at speeds of 33.86 petaflops per second. While the supercomputer race... » read more

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