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Rob Campbell
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Launching my new book, Trajectory Book 1 on Amazon Kindle and Wattpad. Read about it on my blog.

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Off to the editors. #shipit

Book 3, aka The Thing That Would Not End, has now shipped to my very brave editor for dissection. A select few pre-beta readers have also been given copies to pore over and study while I quietly hyperventilate in the corner. It’s fine. Once it’s been…

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Android Photography Apps, 2017 edition

(featured image: My Nexus 6P in armor case by Poetic.) Hey. It’s Friday. Maybe you’ll find yourself out walking around in this spring-like weather and get the urge to snap some photos on your phone. Here’s a tour of some of the apps I enjoy on my Nexus…

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This post is a note of appreciation for Alessandro Levi Montalcini‘s USB Overdrive for macOS. I put off buying this software for a couple of years, making due with sub-rate work-arounds and inadequate stop-gap drivers for a slew of random USB devices that…

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Lately, I’ve been getting asked when Book 3 of the New Providence Series is going to be out. I owe you all an update on its progress. It’s in the final stages right now. I have about 5k words left to wrap the thing up. I’m going to go back through it for…

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Syncing Playlists with the Fiio X3 (or X1 or X5) on my blog.

Awhile back I wrote a review of my portable digital audio player, the Fiio X3 2nd generation (Amazon US, Canada). The summary of that review was that this is a bare bones audio player, with a simple UI, that is beautifully-built with an attention to sonic…

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Biases _ new blog post about the things we share online and what they say about us.

Biases. Preformed opinions. The conditioned response to feel a certain way about a specific stimulus. We all have them. We’ve been training our brains since birth to help us make sense of the world we live in. Many of them are innocuous. Some are not. “I…

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a dark theme for chrome

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Physicists demonstrate a quantum Fredkin gate

' ... "Similar to building a huge wall out lots of small bricks, large quantum circuits require very many logic gates to function. However, if larger bricks are used the same wall could be built with far fewer bricks," said Dr Patel.  "We demonstrate in our experiment how one can build larger quantum circuits in a more direct way without using small logic gates." ... '

http://phys.org/news/2016-03-physicists-quantum-fredkin-gate.html

A quantum Fredkin gate | Science Advances

'... Abstract

Minimizing the resources required to build logic gates into useful processing circuits is key to realizing quantum computers. Although the salient features of a quantum computer have been shown in proof-of-principle experiments, difficulties in scaling quantum systems have made more complex operations intractable. This is exemplified in the classical Fredkin (controlled-SWAP) gate for which, despite theoretical proposals, no quantum analog has been realized. By adding control to the SWAP unitary, we use photonic qubit logic to demonstrate the first quantum Fredkin gate, which promises many applications in quantum information and measurement. We implement example algorithms and generate the highest-fidelity three-photon Greenberger-Horne-Zeilinger states to date. The technique we use allows one to add a control operation to a black-box unitary, something that is impossible in the standard circuit model. Our experiment represents the first use of this technique to control a two-qubit operation and paves the way for larger controlled circuits to be realized efficiently.
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http://advances.sciencemag.org/content/2/3/e1501531
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