The Pontiff has an interesting preprint here:
Adiabatic Cluster State Quantum Computing
Which suggests that it might be possible to implement gates on a suitable AQC architecture (I wonder where we could find one of those?) by slowly changing the overall Hamiltonian of the system to ‘encode’ gates along the way. Measurement is then only required at [...]
Archive for the ‘quantum computing’ Category
Adiabatic clusters…
Posted in expt vs theory showdown, quantum computing on December 17, 2009 | 2 Comments »
A flurry of interesting preprints…
Posted in cool physics, expt vs theory showdown, learnin' stuff, links, quantum computing, web on December 1, 2009 | Leave a Comment »
My pick of interesting recent ArXiv papers…
So much to read, so little time!
Robust Entanglement in Anti-ferromagnetic Heisenberg Chains by Single-spin Optimal Control
Quantum System Identification: Hamiltonian Estimation using Spectral and Bayesian Analysis
Hierarchical Genetic Algorithm Approach to Determine Pulse Sequences in NMR
Efficient creation of multipartite entanglement in flux qubits
Spin Systems and Computational Complexity
Algorithmic Technique for Decomposing Unitary [...]
P&C @ D-Wave Systems – Redux 2009
Posted in cake, quantum computing on November 26, 2009 | 3 Comments »
In case anyone noticed the blog-tumbleweed accumulation, I should explain where I’ve been: I spent the last 3 weeks in Vancouver at D-Wave hanging out with those awesome pioneers of adiabatic quantum optimization.
I love working with these guys, they are really good at what they do. Thanks go to all the guys there for making [...]
Some nice D-Wave info
Posted in RSFQ, learnin' stuff, links, quantum computing, superconductors on October 22, 2009 | 2 Comments »
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 [...]
Designing qubit circuits
Posted in RSFQ, experimental insights, learnin' stuff, quantum computing, research blogging on October 21, 2009 | 3 Comments »
It’s hard work being the only postdoc in the village. One day I’m fixing wiring on the fridge, the next I’m analysing the effect of spin-flip scattering on my superconductor-ferromagnet data. Today I’m being the local RSFQ/SQUID layout afficionado.
I’m designing some qubit circuits. Process design rules are a pain, there are about 10 layers in [...]
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 [...]
In response to Ray Kurzweil’s comment on Quantum Computing and the brain
Posted in BCI, quantum computing, quantum spookiness on October 8, 2009 | 10 Comments »
I thought I’d make a little note about this because quite a lot of people have been talking about this issue.
Ray Kurzweil addressed the Singularity Summit on Sunday and gave a brief summary of his opinions on some of the other preceding talks. He specifically answered criticism from others of our ability to ever model [...]
Quantum happenings 081009
Posted in links, quantum computing on October 8, 2009 | Leave a Comment »
So to get me out of the futurist frame of mind and back into the Quantum Physics frame of mind, here are some things to read today:
An introduction to measurement based quantum computing:
Measurement-based quantum computation
Preprint of the latest offering from Martinis’ group showing tomography of two entangled gates after performing various operations:
Quantum Process Tomography of [...]
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 [...]
World’s first on-chip quantum computer! Oh wait…
Posted in controversial..., physics fail, quantum computing on September 15, 2009 | 3 Comments »
So I opened my freshly delivered copy of this month’s Physics World and began to mull over the articles whilst enjoying a Kitkat. On the first page I found an piece about Ion Trap quantum computing proclaiming that “Researchers in the US claim to have created the first small scale device that can perform all [...]
