6,099 reputation
1643
bio website jfitzsimons.org
location Singapore, Singapore
age 32
visits member for 3 years, 10 months
seen Dec 6 '13 at 16:11

I have just moved to the Center for Quantum Technologies in Singapore, after spending the last 3 years as a Merton College JRF in Theoretical Physics and a Senior Research Fellow in Oxford University Department of Materials. My research focuses largely on theoretical aspects of quantum information processing. In particular I am interested in spin networks, measurement based computation, cryptography and computational complexity.


Oct
24
comment Linearizing Quantum Operators
Could you link to the paper?
Oct
23
comment Paper listing known Seiberg-dual pairs of N=1 gauge theories
Maybe, but it really seems to require a huge time investment by anyone giving such an answer. Perhaps a better approach would be via community wiki, where people simply edit the top answer to add in any they are aware of that are not already listed.
Oct
23
comment Paper listing known Seiberg-dual pairs of N=1 gauge theories
@Yuji: It is unfortunate that you haven't gotten a definitive answer, but if it doesn't already exist in the literature, it seems unlikely that you will find anyone here with the requisite background knowledge prepared to spend the time it takes to go through 1000 papers to generate the list.
Oct
22
comment Negative probabilities in quantum physics
What on earth are you talking about?
Oct
18
comment What methods are there to deal with quantum spatiotemporal chaos?
I'm not quite sure what you mean by "the qualitative distribution" of a one dimensional cellular automata. Could you clarify this? Two alternating species are sufficient for Turing completeness, given an appropriate update rule.
Oct
18
comment Graduate School for Theoretical Physics
I have to agree with Moshe's last comment. However, I did upvote the question, because I think it is one of the more important types of soft-question.
Oct
18
comment Graduate School for Theoretical Physics
The reason I'm asking is that I think you are perhaps being disingenuous in your view of theoretical physicists. Many papers are themselves mathematically rigorous, but are build on less rigorous foundations (i.e. renormalization etc.). I'm not clear how you view such work. You say your interests lie in QFT, so this is quite important, since unless you are interested only in AQFT, you'll likely find yourself using well established but less rigorous approaches.
Oct
18
comment Graduate School for Theoretical Physics
Could you give us a couple of examples of TP papers you feel are representative of the physics level of rigor? At present, I'm not really clear on where you draw the line.
Oct
16
comment direct sum of anyons?
@NoahSnyder: That is incorrect. For Fibonacci anyons $\phi\otimes\phi\otimes\phi = \mathbb{I} \oplus \phi \oplus \phi$ which is exactly 3 levels. Each $\phi$ in the direct product corresponds to a single dimension. (see for example p17 of rockpile.phys.virginia.edu/trieste08.pdf ).
Oct
16
comment direct sum of anyons?
@André: That's not what the notation means. $\phi + \phi$ is not adding two vectors, but rather creating a 2D vector space from 2 1D vector spaces.
Oct
16
comment Connections of iterative solvers for large systems of equation in Physics?
What type of equations?
Oct
16
comment direct sum of anyons?
+1: A far clearer answer than mine.
Oct
16
comment direct sum of anyons?
@André: Check out Chapter 2 of the first link. They are specifically using qubits encoded in $\mathbb{I} + \mathbb{I}$. Specifically these correspond to the two different ways to fuse four anyons to obtain the vacuum. There are several ways this can be achieved. (see for example quant-ph/0703143 where anyons are encoded as topological defects in a lattice of qubits)
Oct
16
comment Does the complex 3-sphere have a complex structure modulus?
Can you point us towards the section in the paper where that claim is made (it's a long paper)?
Oct
16
comment direct sum of anyons?
@Heidar: Sorry, hadn't seen your answer when I posted this. I guess we were writing them at the same time.
Oct
13
comment Models of higher Chern-Simons type
It is certainly fine to answer your own question if you later find the answer. It's certainly preferable to having unanswered questions.
Oct
12
comment Random Walk Randomly Reflected
@RonMaimon: I have an answer for the asymmetric case too (somewhat different to yours), but it might make more sense to wait for the other question, since it is a completely different argument.
Oct
12
comment Random Walk Randomly Reflected
@Leandro: No problem. As far as I can see this question actually amounts to a random walk on a weighted graph with a certain structure. The most obvious generalization would be a walk on a weighted directed graph, which would give you the direction dependent reflectors.
Oct
11
comment Random Walk Randomly Reflected
@Leandro: No problem.
Oct
10
comment What do theoretical physicists need from computer scientists?
Prakash is something of a special case, as he has a significant background in physics.