Recent comments from SciRate

We've revisted this Matt and shown that even with only a source of maximally mixed single qubit states its possible to generate a resource sufficient for the rest of our construction to go through: https://scirate.com/arxiv/2107.03239

Sometimes, if you're quick, you can catch the paper before it's been compiled by arXiv (I think they do it at least partially on-demand); but I've never seen a true error before (pretty good comment on the arXiv's technical implementation, to be honest!)

I couldn't compile it from arXiv either, but arXiv vanity worked: https://arxiv-vanity.com/papers/2107.00670. Now the PDF works too! I think I might have seen this before but I forget when/where.

When I first tried to open this, the arXiv gave me a "could not compile the LaTeX" error message that I'd never seen before. I downloaded the source myself and compiled it to PDF without any trouble, and it seems to be working on the arXiv now too. Has anyone seen an error like that before?

Hi Michal,

Thank you very much for sharing your great work, which we were unfortunately not aware of. The route you followed towards universality by studying fermionic linear optics + non-quadratic Hamiltonian is one we actually considered initially before deciding to shift strategies, so this is

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A very interesting work! I wanted to point out however that in

https://scirate.com/arxiv/1705.11188

we studied generic universal gate sets for particle-conserving fermionic unitaries. In particular, we classified all unitary transformations that promote the so-called passive fermionic linear

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Beautiful work, bravo!

Glad I could bring a little fun to your day! :-)

Thanks for sharing your notes Blake! It's always fun to read you ;)

I'd had some notes kicking around a bit before someone mentioned that *Helgoland* had been translated into English and said some pertinent things. Maybe the book was a nudge for them, too.

But this time it seems there could be a pretty obvious - even if hidden - (Reichenbachian) common cause: Helgoland (esp. its recent English edition) by Rovelli. No mysterious synchronicity in here...

Hey, nice work! I'd like to advertise to the community a little cute fact, first found in https://link.springer.com/article/10.1007/s00220-021-03988-1 and re-discovered here (with credit given to the above paper): *feed into a 50:50 beam splitter a product state -- any product state; trace out one o

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Well, this is a fun bit of synchronicity! On Wednesday, I had posted some [informal notes about RQM](https://www.sunclipse.org/?p=3016) that grew out of a recent discussion group. The issues of consistency between observers and of how to define measurement timing stuck out to me.

In that paper we conjectured:

*It is possible that via a smarter encoding than these authors are capable of finding, it might be possible to perform quantum computation with J-measurements and only one or two different types of initial state.*

It wouldn't surprise me if this model isn't equiv

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Link to github: [https://github.com/saforem2/l2hmc-qcd](https://github.com/saforem2/l2hmc-qcd)

Thanks for that reference. It relies on having a source of many copies of 3 different states. It is much closer to our model, but still seems not to answer the question.

Yes definitely different than the exchange interaction only work (though clearly the representation theory of the symmetric group is both our friend). But doesn’t this paper answer the question about the power of the model https://arxiv.org/abs/quant-ph/0503151 ?

This time no fisherman's story?

Thank you for the reference, btw. We used in our paper a particular encoding of a qubit as part of proving PostSTP=PostBQP, but perhaps the reference you mentioned gives another encoding that can be used as well. I need to look at it in more detail.

Hi Matt, yes, right, thanks for clarifying.

If I understand correctly, that paper considers unitary evolution under the exchange interaction with controllable time-dependent couplings. In particular, unitary gates exp(i J \vec S_1 \cdot \vec S_2), with J controllable. We consider only a much smaller set of operations: just measuring in s/t

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There are early papers which show that the SU(2)-invariant exchange interaction suffices for universal QC (and measuring in the singlet-triplet basis), see https://arxiv.org/pdf/quant-ph/0005116.pdf so would that work not answer the conjecture?

What a fantastically written review! Very much enjoyed reading this.

This has been an incredibly helpful guide! I very much recommend it.

Makes sense, thanks! In the future I expect we'll try to publish some more code for using and analyzing the THC qubitization approach via OpenFermion, in order to at least make that technique a bit more accessible.

I recently came across this interesting paper (and subsequent work by Aharonov et al. on quantum algorithmic measurements). I wonder if the idea (in this 1610.09619) is in any way similar to the theory in Higgins et al., Nature 450, 393 (2007) (https://www.nature.com/articles/nature06257), which als

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Hey Ryan, thanks for the questions!

(1) Here we considered _all_ of the electrons, including core electrons. It's true that core electrons are not the primary factor in determining the chemical bondings, and thus including them to calculate ground state energies is neither necessary nor the most

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Thanks for your thoughtful comment, Dave. You're right, my one-liner was not particularly considerate and constructive. I did have my doubts about posting it and I'm still not sure how to properly react to this paper. But I also didn't want it to go unnoticed.

What triggered me is the wide gap be

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Thanks for the message and setting the tone Dave. I completely agree with you and, speaking for the moderating team, we will aim to do a better job.

I've been thinking a lot about this comment (probably more than I should!) Certainly it's funny, "quant-hype" is a laugh out loud line. It reminds me of calling the US food retailer "Whole Foods" by the name "Whole Paycheck".

But I would also point out that if we want a community that is kind

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This looks like a very thorough study with multiple substantial contributions, especially on the error-correction side. I have two questions:

(1) Are you simulating active spaces here, like other prior fault-tolerant studies using molecular orbitals, or are you including all the electrons (includ

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I'm having trouble understanding the definitions of "reasonable" and "connected" given at the top of p.3 in this paper, maybe someone can help. The easiest, in order to clarify it, would be to say explicitly what is the graph $G_{supp(S)}$ for $S = Z_1$ and also for $S = Z_1 Z_2$ (in the example giv

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This should have been posted under [quant-hype].

Thanks to a careful reader (thanks to him!), we realized there were a typo in the affiliations: so no breaking news, Elham is not moving to Maryland ;-) I'm not sure how we missed that typo, but a v2 is waiting approval and should appear tomorrow to fix this.

Dear Ramis,

Thanks so much for your kind words. Thank you also for your insightful comments. Indeed, your beautiful work very nicely complements ours, in particular in the way you look at the asymptotic limits of large bond or physical dimensions. We have now discussed and cited your work in the

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Hello,

I wish I could understand it more...
so I have a question about Fig. 3 (Fig. 2 in New J. Phys.-version) and all the argumentation from p. 4 hinged upon:

What if the proces depicted is not about some particle decay, but about some fully (FAPP) deterministic clock-gun mechanism that is s

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Thank you for clarifying! The history of this subject is complicated by independent rediscoveries, different terminologies being used by different fields, etc. We wrote [a review article](https://scirate.com/arxiv/1703.07901) four years ago that is already in some respects outdated!

Dear Blake, thanks for pointing out that confusing statement in the appendix. In the statement, we were indeed referring to their choice of the tetrahedron. We will amend the sentence to reflect this, and also the fact that it was not introduced by them.

I'm a little confused by the statement in Appendix C that

> The second SIC-POVM used in this paper is the one introduced by Jiang et al.

From context, this doesn't appear to be referring to the specific method that [Jiang et al.](https://quantum-journal.org/papers/q-2020-06-04-276/) use (a Bel

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Probably a typo in the abstract: " In this paper, _we_ develop a method..."

Thanks for posting this! I was thinking along similar lines, though not nearly in organized enough a way to get anything written.

If I announced, "Instead of writing $a + bi$, now I will write ordered pairs $(a,b)$ that add entrywise and multiply like $(ac - bd, ad + bc)$," nobody would say that I

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I expanded on this comment in [arXiv:2103.09910](https://scirate.com/arxiv/2103.09910).

Does https://arxiv.org/abs/0912.4495 imply a very similar result?

For those interested, a related paper also hit the arXiv today on this topic: [_Experimental Characterization of Crosstalk Errors with Simultaneous Gate Set Tomography_](https://scirate.com/arxiv/2103.09890).

Our colleague Yasunari had a talk about this topic in March meeting session F32 from 2:23:23, so if you are curious, please watch the presentation! It is still available.

We discussed a similar concept in the paper uploaded to arXiv last October. We used quantum error mitigation for mitigating decoding errors due to failures of error correction and Solovay Kitaev approximation errors. Please check.

https://arxiv.org/abs/2010.03887

We discussed a similar concept in the paper uploaded to arXiv last October. We used quantum error mitigation for mitigating decoding errors due to failures of error correction and Solovay Kitaev approximation errors. Please check.

https://arxiv.org/abs/2010.03887

Sorry for the inconvenience, it's now updated.

Consider chiral tokens and twist odd number traversals (e.g., Berry phase)

Multiple slit matterwave interfere a homochiral molecular beam. Assay the (if any!) interference pattern enantiomer ratio. Hund's paradox: 100% |Left⟩ shoes entering Schrödinger's box exit 1:1 |Left⟩ plus |Right⟩ racemize

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The code repository that this paper references is [empty][1].
[1]: https://github.com/ElieGouzien/factoring_with_memory