I suspect this may be redundant information as my readership is probably entirely contained in the superset of D-Wave’s blog readership, but… For anyone who didn’t see it, there is a series of new posts over at Geordie’s blog about D-Wave’s technology, aims, results, fabrication and mostly anything else you could wish to know about [...]
Archive for the ‘superconductors’ Category
Some nice D-Wave info
Posted in RSFQ, learnin' stuff, links, quantum computing, superconductors on October 22, 2009 | 1 Comment »
Herding quantum cats
Posted in cake, expt vs theory showdown, feeling dumb, quantum computing, quantum spookiness, superconductors on October 20, 2009 | 3 Comments »
Two interesting arXiv papers this week:
Adiabatic quantum computation along quasienergies
A potentially new model of Quantum Computation, which is a discretized variant of Adiabatic Quantum Computation (AQC). Is it equivalent to the standard model? Is it useful? No-one knows.
This paper also got me thinking:
Electronic structure of superposition states in flux qubits.
How do you measure the cattiness [...]
Experimental Physics + Internet = Fail.
Posted in controversial..., physics fail, superconductors on October 13, 2009 | 9 Comments »
LOL. You know, if this guy keeps making these discoveries, there isn’t going to be any science left for the rest of us to do. No fair!
Superconductor World Record Surpasses 250K
Violation of Bell’s inequality in Josephson phase qubits
Posted in expt vs theory showdown, links, quantum spookiness, superconductors on September 24, 2009 | 1 Comment »
Very cool…another step towards demonstrating that Josephson phase/flux systems can be treated as macroscopic coherent quantum objects.
Violation of Bell’s inequality in Josephson phase qubits
I was wondering if you could demonstrate this the other day!
From Science Daily:
The measurement of a Bell violation in a superconducting circuit was recently stated to be the next primary challenge for [...]
CSQ2010
Posted in conferences, quantum computing, superconductors on September 22, 2009 | 3 Comments »
Via The Quantum Pontiff:
What an AWESOME idea for a conference!
Coherence in Superconducting Qubits 2010
…I shouldn’t get so excited about these things, but, but… just look at the topic list!
This conference will foster discussion and collaboration among investigators stimulating:
* A fuller, more accurate understanding of the types of defects limiting coherence in superconducting [...]
Qudos on the Qudits!
Posted in cool physics, expt vs theory showdown, quantum computing, superconductors on August 12, 2009 | 1 Comment »
Martinis group at UCSB have demonstrated operations on a quantum bit with 5 levels (qudit with d=5) instead of the usual 2 (qubit):
“Emulation of a Quantum Spin with a Superconducting Phase Qudit”
Matthew Neeley,1 Markus Ansmann,1 Radoslaw C. Bialczak,1 Max Hofheinz,1 Erik Lucero,1 Aaron D. O’Connell,1 Daniel Sank,1 Haohua Wang,1 James Wenner,1 Andrew N. Cleland,1 Michael [...]
You won’t find dark energy in Josephson junctions either
Posted in expt vs theory showdown, links, superconductors on July 26, 2009 | Leave a Comment »
Via ArXiv Blog:
An investigation (and rebuttal) of claims that it might be possible to interpret a component of the spectral noise in Josephson junctions as being due to the prescence of vacuum fluctuations:
Dark energy and Josephson junctions
Quite interesting…
Quantum Neural Networks 1 – the Superconducting Neuron model
Posted in BCI, RSFQ, feeling dumb, learnin' stuff, quantum computing, superconductors on July 20, 2009 | 12 Comments »
I’m interested in Quantum Neural Networks, specifically how to actually build the things. Any input would be greatly appreciated on this one. This is open notebook science in an extreme sense: I’m discussing here something I’d like to go into eventually, it may be several years down the line, but it’s worth thinking about it [...]
Scalable cavity QED quantum computer? Not yet…
Posted in expt vs theory showdown, quantum computing, superconductors on June 28, 2009 | 1 Comment »
This Story:
Demonstration of two-qubit algorithms with a superconducting quantum processor
Is being reported in several places at the moment, see here and here for example.
Whilst I’m confident that it works well in the few qubit limit, I’m not at all convinced that cavity QED is a scalable QC architecture. We’ve done some work on this architecture [...]
Supercool talks
Posted in cool physics, fun and games, outreach, shameless self-promotion, superconductors on June 26, 2009 | Leave a Comment »
So we’ve had a week of University Admissions open days and activities days here in Physics land. Here are a couple of pictures where I’m giving a talk entitled ‘Supercool Computers’ to AS level students (16-18).
We typically show some demonstrations with Liquid Nitrogen, verify that gases do not follow the ideal gas law using [...]
