Hi,
my name is Roberto Bovolenta, and I’m an Italian physicist. In former times I’ve worked in the fields of nanoscience and acoustic, and recently I got interested, on my own, in quantum computation world.
I’ve recently published a paper on arXiv, titled “Proposal for a computation procedure based on continuous-variable post-selected teleportation”, that you can find at this link:
http://arxiv.org/abs/1304.1892
The paper consist of a potential procedure based on the combination of an alternative information encoding system inside the state of an electromagnetic mode and on continuous-variable post-selected teleportation, for speedup the computational power of a classic computer as expected from the closed timelike curves (CTC) of David Deutsch in his paper of 1991 “Quantum mechanics near closed timelike lines”.
The main peculiarity of this procedure is the following: unlike the discrete case, thanks to the closed timelike curve via quantum post-selection (P-CTC), we can, in principle, treat, with a single P-CTC, an unlimited quantity of information, so would no longer be necessary to build a complete quantum computer, since we need only a simple classic CPU to perform the computation and to implement it in our time loop.
Now, as we know, this “time loop process” in theory could be susceptible to the unavoidable experimental errors that could compromise the entire process, and that is why I’ve developed also an alternative scheme which first performs the entire computational process in the classic computer, then the output measure will be revealed in a previous instant at the end of computation.
Therefore, we could obtain a considerable simplification and benefits in terms of realization, and personally I believe that, if the P-CTC really had a potential usefulness for the increase of computational power, this two schemes could be a fascinating test.
For any clarification, don’t hesitate to reply.