Recent comments from SciRate

Very good Insight on android security problems and malware. Nice Work !

Hi, How can i get it??

Dear Mark, thx for your comment. There are indeed missing citations to previous works by Rafal, Janek and Lorenzo that we forgot to add. Regarding your paper, I did not read it in detail but I have two main comments:

1- What you are using is completely equivalent to the tool of "quantum simulatio

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An update http://arxiv.org/abs/1609.02160v2 of this paper has appeared, one day after the arXiv post http://arxiv.org/abs/1611.09165 . The paper http://arxiv.org/abs/1609.02160v2 now includes (without citation) some results for bosonic Gaussian channels found independently in http://arxiv.org/abs/16

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Thank you very much for the reply!

Oded Regev writes [here][1]:

"Dear all,

Yesterday Lior Eldar and I found a flaw in the algorithm proposed
in the arXiv preprint. I do not see how to salvage anything from
the algorithm. The security of lattice-based cryptography against
quantum attacks therefore remains intact and uncha

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Here, the string diagrams (for qudits, transformations, and measurements) may have charge. The manipulation of diagrams with charge requires para-isotopy, which generalizes topological isotopy; and the relation for para-isotopy is found on pg. 11, in eq. (22). Essentially, para-isotopy keeps track

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Could you give an example of a topological isotopy that transforms the transformation $T$ on p.3 into the one in eq. (6)? On a related note, how is a topological isotopy defined?

This is a very nice review article.

All comments are very welcome. We list 10 open questions at the end of the review, and would be happy to expand the list. Accepted contributions will be acknowledged.

[magic mirrors][1] really?

[1]: http://buchderFarben.de

too optimistic

Is it [fantasy][1] or real?

[1]: http://buchderfarben.de

There is a lot of discussion about the paper by Atiyah (claiming to solve this famous question) in the math community - with a bit of skeptical edge - both on reddit and on mathoverflow:

https://www.reddit.com/r/math/comments/5aajsn/161009366_the_nonexistent_complex_6sphere_michael/

http://mathov

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Very nice! Now we finally know how to fairly cut a cake in a finite number of steps! What is more, the number of steps is expected to go down from the whopping $n^{n^{n^{n^{n^n}}}}$ to just barely $n^{n^n}$. I can't wait to get my slice!

https://www.quantamagazine.org/20161006-new-algorithm-solve

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It's also available in the bar on the right of http://arxiv.org/abs/1609.06373

The following paper found a setting in which adaptive operations do not help in quantum channel discrimination:

https://arxiv.org/abs/1408.3373

It is published as

Communications in Mathematical Physics, vol. 344, no. 3, pages 797-829, June 2016

http://link.springer.com/article/10.1007%2

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Thank you for your kind words. Indeed, we worked hard to achieve the attributes you mentioned.

Spinning black holes are capable to implement complex quantum information processes with qubits encoded in the X-ray photons emitted by the accretion disk.

I do not find this second abstract more informative, and it is definitely less entertaining to read. I really like the original abstract because, despite its tale format, it really works as an informative abstract.

I approve of this comment.

Sounds like a nice fable for young readers of [this book][1].

[1]: https://www.amazon.com/Quantum-Physics-Babies-Chris-Ferrie/dp/1492309532

Here is the second (more informative) abstract:
We introduce a new quantum cryptographic primitive which we call
a tokenized signature scheme. Such a scheme can be used as an ordinary
digital signature scheme, with the additional property that the signer
can produce and distribute one-use quantum si

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Many thanks for the clarification! I think I see your point (we had a similar issue with needing to have high overlap with input and output penalty in the universal adiabatic construction in my paper with Gosset and Vershynina, using the space-time construction).

Thank you for the question! This construction due to Peres is interesting, but if I'm analyzing it correctly then I don't think it would work in the context of our paper. The ground state probability distribution of the Hamiltonian with couplings in Peres eq (20) looks like the ground state of a d

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In http://journals.aps.org/pra/abstract/10.1103/PhysRevA.32.3266 Asher Peres showed how to modify the Feynman Hamiltonian to make sure that a Hamiltonian evolution starting at t=0 lands after some fixed time at the desired output time so that the Hamiltonian effectively corresponds to that of large

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Thanks!

The supplemental material is in the arXiv source. Once you extract the tarball, it's under anc/supplemental_material.pdf.

The supplemental material is missing! It would great to see the LP optimisation method used.

Is it actually decidable? :-)

I like this sentence from the conclusion: "There is, however, a second possible answer to our question: yes".

Here is a link for those who also haven't heard of SciPost before: https://scipost.org/

This is the very first paper of SciPost, waiting for the first paper of "Quantum" (http://quantum-journal.org). There are radical (and good!) changes going on in scientific publishing.

"Ni." would be slightly shorter, but some may find it offensive.

The abstract my be a bit too long.

I would suggest planets where life can really make a difference.

I am still trying to understand the following statement from II.A.

> This leads to the condition that the first- and second-order moments
> of the model and data distributions should be equal for the parameters
> to be optimal.

So beautifully written!

John also has an excellent series of 7 blog posts covering this material:
https://www.physicsforums.com/insights/struggles-continuum-part-1/

I think that we have missed the "semi-" at the conclusion. Because, the proof of the theorem 4.3 is based on the using universal semi-density matrix concept which is not computable. The semi-computability concept used here is like the Kolmogorov complexity which is not computable and so the Cubic co

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I could well be missing something. But as far as I could tell from a rather quick read through the paper, all they show is that the quantum capacity of a channel with computable matrix elements is given by the regularised coherent information optimised over input ensembles with computable matrix ele

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Do I understand correctly that this paper claims to show that quantum capacity is computable?

> After defining the algorithmic quantum capacity we have proved that it
> equals the standard one. Furthermore we have shown that it is
> computable.

That is really a long-term perspective.

Born in Italy, and now living in Scotland: I have no excuses not to feel inspired :-)

It is not just in Scotland but in fact across the whole of UK and even beyond. I just found a reference, dating back to the very birth of quantum computing, where the early pioneers [already admit][1] that their work was inspired by Rabezzana Grignolino d'Asti.

[1]: https://scirate.com/arxiv/quan

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A video of a talk I gave this morning will be [here][1], if it ever finishes uploading.

[1]: https://youtu.be/I8cMY0AmIY0

Hi, sorry to just be updating this discussion now -- my conversation with Renato seemed to me to have converged here (and also continued via email and in person and I never updated scirate). However, a few people have asked what the outcome of our discussion was. So let me just say, that yes, my vie

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Conjugate Gradient IS a Krylov-space method...

I completely agree with your analysis, which describes the gedankenexperiment from a global (“outside”) perspective, according to the laws of Bohmian Mechanics (BM). And, indeed, it shows that the "memory" of a measurement outcome cannot assumed to be permanent, i.e., it may change (according to BM)

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Roger Colbeck drew our attention to this paper in the York QFIT group, and we met to discuss it last week. I would like to comment on the relation of Bohmian quantum mechanics to the extended Wigner's friend experiment. As generalised by John Bell, Bohmian qm can be applied to this experiment to yie

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