System Bits: March 10

By Ann Mutschler - 10 Mar, 2015 - Comments: 0

Surviving entanglement breakdown Researchers at MIT have discovered that preserving the fragile quantum property known as entanglement isn’t necessary to reap benefits. By way of background, the MIT team reminded that the promise of quantum information processing, i.e., solving problems that classical computers can’t, as well as perfectly secure communication depends on a phenomenon cal... » read more

System Bits: Jan. 13

By Ann Mutschler - 13 Jan, 2015 - Comments: 0

Quantum computational circuits MIT researchers have built an array of light detectors sensitive enough to register the arrival of photons and mounted them on a silicon optical chip, which could be critical components of quantum computing devices. They pointed out that single-photon detectors are notoriously temperamental. For example, of 100 deposited on a chip using standard manufacturing ... » read more

System Bits: Dec. 2

By Ann Mutschler - 02 Dec, 2014 - Comments: 0

A graphene layer reads optical information from nanodiamonds electronically It is assumed that nitrogen-vacancy centers in diamonds could be used to construct vital components for quantum computers but reading optically-written information electronically from them has not been possible. Now, by using a graphene layer, a team of scientists headed by the Technische Universität München (TUM) ha... » read more

System Bits: Oct. 14

By Ann Mutschler - 14 Oct, 2014 - Comments: 0

Exotic states of light and matter In research that merges two areas that have only been studied separately, ETH researchers are studying solid-state physics and quantum optics as a potential first step toward quantum computing. Specifically, the physicists are looking between tiny mirrors to a special layer of the semiconductor material gallium arsenide, prepared in such a way that the elec... » read more

How To Program A Quantum Computer

By Katherine Derbyshire - 28 Aug, 2014 - Comments: 5

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

Watching Qubits At Work

By Katherine Derbyshire - 18 Aug, 2014 - Comments: 0

As previously discussed, part of the appeal of qubits based on nitrogen-vacancy (N-V) defect centers in diamond is the ability to manipulate them with light. Light pulses can be used both to initialize the qubit array and to measure the results of quantum computations. As recent work at The University of Chicago shows, light can also be used to study the evolution of the quantum state in the... » read more

Reading About Quantum Computing

By Katherine Derbyshire - 14 Aug, 2014 - Comments: 1

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

By Katherine Derbyshire - 30 Jun, 2014 - Comments: 1

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

By Katherine Derbyshire - 09 Jun, 2014 - Comments: 1

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

Introduction To Quantum Computing

By Katherine Derbyshire - 28 Apr, 2014 - Comments: 2

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

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Knowledge Centers
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