Quantum Bayesian Networks

December 17, 2011

One Blog is Worth a Thousand Conferences (said by Confused-cius, circa 500 BC)

Filed under: Uncategorized — rrtucci @ 10:33 pm

This blog is mostly about quantum computing(1). Nevertheless, the medium —in this case blogging— always becomes part of the message. So I decided to pay homage to blogging by scouring the WWW and collecting from it cartoons about blogging that I especially liked. This is but a small sample. There are lots of good ones out there about the subject.

I believe reading blogs benefits many people. (I for one get a lot out of reading them.) A blog (especially if used in combination with ArXiv) is a very efficient way of disseminating scientific information to the general public and to the blogger’s peers. It is an excellent vehicle for one to explain the motivation behind one’s work, and for answering other people’s questions about that work. It’s also very good for discussing other people’s work.

Scientific conferences, on the other hand, I view less favorably. For one thing, conferences seem to be harder to opt out of, if you don’t like them, once you are there. In our times, now that it’s possible to communicate so easily, quickly and comprehensively between almost any two points on earth, physical conferences seem to me a bit antiquated. A big bit. Perhaps even an anachronism. This suggests the question, should physical conferencing be updated or simply abolished? I bet Steve Jobs would have immediately replied abolished. But Steve Jobs was a visionary who got things done, and such people are few and far between in Academia. Academia changes at a glacial pace compared with technology and industry. Academics are very slow learners about their own system.

(1) By this I mean it’s not about carpentry or home gardening, it’s not about every single topic under the sun that interests me, and it’s for the most part not about me. I try to keep this blog sharply focused on quantum computing. There are lots of blogs on the web that are of a more personal nature, and I myself much enjoy some blogs that are like that, but this one isn’t intended to be very personal. Of course, a blog is like a big bay window into a blogger’s inner soul, whether he wants it or not, but in this blog, I try to avoid as much as possible talking about myself (and my dark past…), except when I talk about my work on quantum computing.

December 15, 2011

Q Comp, Q Comp! (New York, New York!)

Filed under: Uncategorized — rrtucci @ 7:32 pm

In this blog, I frequently argue for REAL QC programming (instead of QC programming vaporware). Frank Sinatra was also very interested in QC programming. One of his most famous songs is about the very subject. Here are the lyrics.

Q Comp, Q Comp! (New York, New York!)

Start spreading the news (Start spreading the news)
I’m q coding now, (I’m leaving today)
I want to be a part of it (I want to be a part of it)
Q Comp, Q Comp (New York, New York)

Make parallel moves (These vagabond shoes)
Like Schroedinger’s meow (Are longing to stray)
And pass right through pesky barriers (And step around the heart of it)
Q Comp, Q Comp (New York, New York.)

I want to write in a Q language (I want to wake up in a city,)
that doesn’t suck, (That doesn’t sleep,)
To find the min of the hill- ah- (To find I’m king of the hill- ah-)
Least of the heap. (Top of the heap.)

My classical views (My little town blues)
Are melting away (Are melting away)
I’m gonna make a brand new start of it (I’m gonna make a brand new start of it)
In weird Q Comp. (In old New York.)
If I can make it there, (If I can make it there,)
I’d make it anywhere (I’d make it anywhere)
It’s up to you, (It’s up to you,)
Q Comp, Q Comp. (New York, New York.)

Important news in the QC programming area: Recently, D-Wave opened a “developer portal“. A very good move, in my opinion. It’s sure to benefit not only D-Wave, but the field of QC programming as a whole. (Henning Dekant has an insightful blog post about it here) I hope that we will soon witness the emergence of even more portals into this new dimension.

December 5, 2011

Extra, Extra, Read All About It: Decoherence Times of Latest Superconducting Qubits Now Very Close to Times Needed For Quantum Error Correction

Filed under: Uncategorized — rrtucci @ 10:40 pm

Check out

Viewpoint: Superconducting Qubits Are Getting Serious
by Matthias Steffen, December 5, 2011 / Physics 4, 103 (2011)

(The html version of Steffen’s article is a bit mangled at the present time, but you can download (for free) the pdf version and that one is just peachy.)

This excellent article by Herr Doktor Matthias Steffen (at IBM) reviews the following paper by a group of people from Yale Univ.:

Observation of High Coherence in Josephson Junction Qubits Measured in a Three-Dimensional Circuit QED Architecture, by Hanhee Paik, D. I. Schuster, Lev S. Bishop, G. Kirchmair, G. Catelani, A. P. Sears, B. R. Johnson, M. J. Reagor, L. Frunzio, L. I. Glazman, S. M. Girvin, M. H. Devoret, and R. J. Schoelkopf

The first superconducting qubit, built in 1999, had decoherence times of about 1 nanosecond. The Yale group has demonstrated superconducting qubits with relaxation times T1 = 60 μs and dephasing times T2 = 20 μs. That’s an improvement by a factor of 10,000 in ten years! Mamma Mia! Hot Dog! (Gate model-) quantum computers are so close, I can taste them!

Compare this to the decoherence times of 4 μs for the resonators of UCSB’s von Neumann architecture which I described in a previous blog post (in English,

December 1, 2011

California Dreaming

Filed under: Uncategorized — rrtucci @ 11:28 pm

Recently, Californian universities UCSB and USC have been making great strides in quantum computing. Those quantum computerists who work at IQC (in Waterloo, Canada) may enjoy this song. (I much enjoy the song myself. I also enjoy throwing a monkey wrench into Perimeter/IQC’s hyperactive, vaporous publicity machine 🙂 )

California Dreaming (by the Mamas and the Papas)

all the leaves are brown
and the sky is grey
I’ve been for a walk
on a winter’s day

I’d be safe and warm
if I was in L.A
California Dreamin’
on such a winter’s day

stopped into a church
I passed along the way
well, I got down on my knees
and I pretend to pray

you know the preacher likes the cold
he knows I’m gonna stay
California Dreamin’
on such a winter’s day

all the leaves are brown
and the sky is grey
I’ve been for a walk
on a winter’s day

if I didn’t tell her
I could leave today
California Dreamin’
on such a winter’s day x3

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