The world’s largest table March 29, 2008
Posted by Geordie in Fightin Round the World, General.26 comments
Anyone want to guess where this is?
Some new science March 8, 2008
Posted by Geordie in Published Stuff, QC-Related Posts, World Domination.6 comments
The Role of Single Qubit Decoherence Time in Adiabatic Quantum Computation
We numerically study the evolution of an adiabatic quantum computer in the presence of a Markovian ohmic environment. We consider Ising spin glass systems with up to 20 coupled qubits that are independently coupled to the environment via two conjugate degrees of freedom. We demonstrate that the required computation time in the presence of the environment is of the same order as that for an isolated system, and is not limited by the single qubit decoherence time T2*, even when the minimum gap is much smaller than temperature. We also show that the behavior of the system can be efficiently described by a two-state model with only longitudinal coupling to the environment.
The main result is summarized in the conclusions:
…we have explicitly demonstrated that the computation time in AQC can be much longer than single qubit decoherence time T2∗.
Unemployment rate in Canada at a 33 year low March 7, 2008
Posted by Geordie in Uncategorized.4 comments
Here are some new job postings.
20080205_quantum_information_theory.pdf
I am Gamblor March 3, 2008
Posted by Geordie in General.28 comments
While I was watching my old buddy Dan Henderson get beat up last Saturday I got into a beer- and scotch-fueled argument with my boxing coach (who also happens to be a criminal defense lawyer for people with names like Lucky who have institution mandated “halos of security” that you have to stay out of) about gambling. Here is the scenario. Two people. Person A is The Buyer and person B is The Bank.
The Buyer agrees to pay a certain sum (to be determined) to The Bank to play the following game.
The Bank tosses a fair coin until it comes up tails. The number of heads before the first tails comes up we define to be N.
If N=0 (the first coin toss comes up tails) The Bank pays The Buyer nothing. If N>0 The Bank pays The Buyer 2^(N-1) dollars.
For example if The Bank throws {heads, heads, heads, tails} then N=3 and The Buyer gets paid 2^(3-1)=4 dollars.
The argument was about what price The Bank should charge to The Buyer to play this game to ensure a “house edge”. What do you think?
