The h Bar - 2017-08-22 (page 3 of 4)

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7:00 PM

ugh, programming, what I am doing right now and prevent me form enjoying the chemistry

AccidentalFourierTransform

more like chemistry prevents you from enjoying the chemistry

No, it's the annoyng PBS job submission system that the NCI cluster used, I am stil trying to figure out how to create a sequence of job that run by itself

That does not involve chemistry at all, but computer infrastructure and data structures

The chemistry itself is straightforward, it is those softwares and how they fit together is not

@AccidentalFourierTransform you want to use the Laplace transform for homogeneous equations

I am heading to sleep now. It's 5:05 now. Too bad I will miss the rest of Danielsank's discussion, but I learnt a lot from today

AccidentalFourierTransform

is there any way to look into the latex code of an arxiv paper?

I want dat semisum symbol

7:07 PM

@AccidentalFourierTransform Of course, just download the source

AccidentalFourierTransform

@Secret sleep tight

@ThomasKlimpel hmm... how?

@AccidentalFourierTransform on arxiv

link to abstract page?

AccidentalFourierTransform

arxiv.org/abs/1403.5803

@AccidentalFourierTransform Other Formats, and then Source

AccidentalFourierTransform

sweet

7:08 PM

%\documentclass[12pt]{amsart}
\documentclass[12pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage{amsmath,amsfonts,amssymb,amsthm,mathabx}
\bibliographystyle{utphys}
\usepackage{cite}
%\usepackage{times}
\usepackage{hyperref}
\usepackage{graphicx}
\usepackage{stmaryrd}
% \usepackage{here}
% \usepackage[margin=1in]{geometry}
% \setlength{\parindent}{0pt}
%\usepackage{showlabels}

%PACS 04.60.Cf, 04.20.Ha, 04.20.Jb, 11.15.Yc, 11.25.Tq, 11.30.-j
%\usepackage{mathpazo}
%\usepackage[mathscr]{eucal}

AccidentalFourierTransform

\oright perhaps?

$\oright$

hmm

@AccidentalFourierTransform you might have to check the packages

@ACuriousMind what is the rationale behind $\int dx\, f(x)$

AccidentalFourierTransform

@ThomasKlimpel yay, thanks :D

@0celóñe7 I do not understand the question

@ACuriousMind why do some people write it like that

AccidentalFourierTransform

7:12 PM

user image

what's wrong with the normal way

AccidentalFourierTransform

bc its a linear operator

you always write linear operators as acting from the left

@Mithrandir24601 that was fun, thank you.

AccidentalFourierTransform

@DanielSank are you going to upload the video to youtube or something?

wait. Commented out text, as with %, is also available on arxiv files?

@AccidentalFourierTransform good to know people can see source, eh?

my source usually has adult fanfics that I write when stuck

AccidentalFourierTransform

7:17 PM

there might or might not be some paper with a lot of commented out swearing in Spanish then

I just % them out

Um... Mith's AMA is now, right?

@AccidentalFourierTransform lol

@Sid In 43 mins.

Mithrandir24601

@DanielSank It was fun for us as well :)

@AccidentalFourierTransform Yeah that should be possible.

AccidentalFourierTransform

7:21 PM

if you do, let me know

apparently I made a cameo

AccidentalFourierTransform

on purpose?

no

AccidentalFourierTransform

of course it was on purpose

:(

AccidentalFourierTransform

7:23 PM

you love being the centre of attention dont you

no

@PrathyushPoduval They are in Persian! But if you understand, visit iranpho.ir

Mithrandir24601

@0celóñe7 It was quite funny really

@Mithrandir24601 was it a video?

Mithrandir24601

@0celóñe7 No, just a photo of you with Daniel talking over it

AccidentalFourierTransform

7:25 PM

hmm Im not sure I wanna watch the video

I dont really want to know how your faces look like

they are not gonna look like I imagine them

and its gonna be disappointing

Daniel looks far more Jewish than I thought

Mithrandir24601

@AccidentalFourierTransform I was the guy in the corner with the cup of tea. Because I always have tea

that's not a bad thing

just very...yeah

AccidentalFourierTransform

and what if 0celo7 is actually handsome? that is gonna be really shocking tbh

Mithrandir24601

Anyway, I'd like to be home for my AMA, so I should probably actually go home now...

7:27 PM

@Blue Thank you man!

@AccidentalFourierTransform as handsome as 300 lbs can be

AccidentalFourierTransform

Ive seen your arm

you had some freckles

looks at arm

uhh, what picture?

AccidentalFourierTransform

one that you posted here

you were touching something

an xbox?

a pc?

oh, the cat

AccidentalFourierTransform

7:29 PM

a pile of books?

ah, yeah, the cat

its always the cat

they are stupid you know?

I know

he's retarded

literally one of the stupidest cats

I still love him though

AccidentalFourierTransform

you know what they say about pets, right?

no

AccidentalFourierTransform

"if your cat is retarded then you ugly as f*"

oh

that's not nice

AccidentalFourierTransform

7:32 PM

also, do jewish people actually look jewish?

yes

AccidentalFourierTransform

in US tv, everybody knows when someone is jewish just by their look

I can never tell

how does that work?

we all get a jewdar at birth

AccidentalFourierTransform

give me long curly sideburns or Im lost

Spanish people look Jewish

so I can't blame you

AccidentalFourierTransform

7:34 PM

do we?

russian people are the most recognizable

*Indian

AccidentalFourierTransform

AFAIK, there arent many jews here in Europe, for some reason they left

@AccidentalFourierTransform I bet @ACuriousMind knows

AccidentalFourierTransform

user image

ಠ_ಠ

Poland, what happened to you!?

7:36 PM

Germans

What happened to Russian Jews tho

did they drop their faith or were they killed

AccidentalFourierTransform

Hitler was from Austria - ACM

blaming the Austrians is a classic move

Trump has German heritage

coincidence?

AccidentalFourierTransform

:: thick Russian accent :: "I christian, kids christian, family christian"

@0celóñe7 You mean, "What happened to Russians tho?"

it goes it goes it goes it goes GULAG

the bad thing was that you couldn't even convert to Christianity

you had to be like 3 generations removed

7:43 PM

@AccidentalFourierTransform Well, uh, that's kind of true. I don't think Russians have had a major religious foundation before Christianity; they were mostly various slavic tribes and group of people.

@0celóñe7 all that hair is from my mom's Lebanese side.

@AccidentalFourierTransform uh, yeah, if you give them the tex source then they have the tex source.

@0celóñe7 in the Soviet era, religion was suppressed.

People had "new year trees".

@DanielSank Agree, but that's a 2015 poll.

Maybe it was killed off "for good"

Or maybe they were Gulag'd

@0celóñe7 yes well many left

I think every Russian family I knew in Rockville growing up we Jewish.

It wasn't just religion though.

@0celóñe7 a whole lot of them were killed in pogroms.

The inteligencia was not trusted in Soviet society, according to an ex-Soviet physicist I spoke with recently.

7:50 PM

A lot of others tried to leave, but a lot of the time they weren't allowed to leave.

And for historical reasons, Jewish families tended to produce a lot of inteligencia.

@AccidentalFourierTransform depends. What do you think I look like?

@Mithrandir24601 what is your AMA going to be about

@Mithrandir are you jewish?

Yes.

@DanielSank Trofim Lysenko's followers constituted a big intelligentsia!

That's not true!

7:53 PM

@Mithrandir I may or may not get suspended for making a joke

this is a loaded question

raises eyebrow

If you feel that it's possible that something may get you suspended, it's probably best not to say it at all.

On the other hand, you've now piqued my curiosity.

You here, @Mithrandir24601?

@Mithrandir more or less like previews.123rf.com/images/kobby_dagan/kobby_dagan1110/…

Mithrandir24601

@ACuriousMind yep!

Alright!

Hi and welcome to Mithrandir24601's AMA. His introductory meta post is here. Please keep unrelated discussion out of this room for the duration of the AMA and use the backup room. Take it away, @Mithrandir24601!

8:00 PM

phew - back just in time.

Mithrandir24601

@heather So am I! :P

Anyway, Rytsas Tolvis!

rytsas!

Mithrandir24601

Right, so first question: role of religion/theology

Or, perhaps I should introduce myself first?

o/

yus

a quick introduction might be good @Mithrandir24601 ::shrugs:: up to you.

Mithrandir24601

8:04 PM

I'm a PhD student, studying quantum engineering and my PhD topic is most likely going to be on simulating non-hermitian Hamiltonians on a quantum chip. I've got a Masters in Mathematical Physics and a Bachelors in Physics with Computer Science. I've got a variety of interests that include music, reading, tea and chocolate. I'm also into religion/theology (there were a few questions on this)

More specifically, academically, I'm interested in things like quantum computing and measurements. Currently, I've just finished a really interesting project on looking at noise in what's known as t-designs, which are used in randomised benchmarking of quantum chips

Oh, and I've just came back from the seminar that's on the star-board!

Anyway, first question:
**What role has religion/theology played in your studies?**

Directly, none, although it has influenced things that I'd consider looking at due to the people I get to know being involved in that, such as medical physics

Indirectly, possibly, as a large number of my friends are from my time as chapel clerk, which obviously influences decisions to some extent, but this is a lot harder to quantify

Does someone else want to introduce the questions?

@Mithrandir24601 hi thx for your session! suggest you cover all the questions you want in lull periods but maybe try to encourage participation by audience at this pt?

Mithrandir24601

OK, has anyone got any questions on that?

well, i do have a question, not quite related to the one you were discussing.

what do you think about the recent launch of a quantum communications satellite by a researcher in China?

(i mentioned it earlier in here; i can dig up the reference if you'd like.)

@Mithrandir24601 so is your family religious? do you find no conflict between science/physics vs religion, or any thoughts on that?

Mithrandir24601

@heather I'll answer @vzn first, as it's more relevant to the current topic

8:14 PM

sounds good.

Mithrandir24601

@vzn Yes, although they'd be more typical Northern Irish Presbyterian, while I'd consider myself a lot more (high) anglican

Personally, I don't see any conflict - my Director of studies as well as other students I knew as an undergrad were (are) also religious. On the physics lab of where I did my undergrad, the phrase "The works of the Lord are great; sought out of all them that have pleasure therein" is inscribed on the front entrance

AccidentalFourierTransform

nice phrase

please cover your dwave visit at some point! a whole wk? was geordie rose there? did you meet him? any opinion on the aaronson needling of the company? etc

Mithrandir24601

So, I spent my entire undergrad learning from a bunch of religious and talented scientists as well as being friends with people like theologians, the dean of the chapel, the vicar etc. and we also had long (several hours over port, into the early hours of the next morning. The latest I got back from one of these was at 5am) discussions on things like this a few times a term

@AccidentalFourierTransform It is. It's also something that I've really realised I've taken to heart, along with things such as the meaning of 'Logos' (often translated as 'the word', which is the most inadequate translation ever)

AccidentalFourierTransform

what translation would be more adequate?

Mithrandir24601

8:22 PM

Essentially Logos is better translated as something more along the lines of 'the logical argument', which completely changes things

AccidentalFourierTransform

yes it does :-P

Mithrandir24601

How would mathematicians view the Bible if one of the chapters started with 'In the beginning, there was logic'?

but anyway, I digress

@Mithrandir24601 that's...actually pretty interesting. i had no idea, thanks for bringing that up!

Mithrandir24601

@heather It's essentially how the Gospel according to John starts

@Mithrandir24601 Indeed - "In the beginning, there was the Word, and the Word was with God, and the Word was God..."

Mithrandir24601

8:25 PM

Exactly

or, rather - "In the beginning, there was Logic..."

Mithrandir24601

"... and the logic was God"...

Things like that have definitely influenced my view on things

Anyhow, I should move on - I'll be here a while afterwards, so we can get back to this later if people want

sure.

Mithrandir24601

I'll mention the satellites next

I did an essay about this :)

=D

Mithrandir24601

8:27 PM

It's AMAZING

reference for those who are interested: Physics Today, vol 70, #8, pg 14-16

Mithrandir24601

Although, technically, all the stuff they did is possible from off-the-shelf equipment and slightly adapted telescopes, with an absolute ton of money :P

The tracking system already existed and has been used to track a plane flying along and transmit quantum signals

was that the research done by Dr. Wong's group at MIT?

@heather physicstoday.scitation.org/doi/10.1063/PT.3.3648

Mithrandir24601

There are additional effects from the atmosphere, but they don't actually have that much of an effect, surprisingly. Atmospheric attenuation is really low as light's only attenuated in the first 10km or so of the atmosphere

@heather They might have done some of that, I'm not sure, but the paper I'm referring to is actually from nature.com/nphoton/journal/v7/n5/pdf/…

8:33 PM

ah, i see, thank you.

Mithrandir24601

@heather So it was really one of those moments like a lesser version of the discovery of special relativity when all the background physics was there, but it took someone really good to bring it together (and in this case, money) to get it working

you said you visited D-Wave; do you agree with Scott Aaronson's comments about them?

Mithrandir24601

So, at the start, what happened is that D-Wave had a bad PR person (or maybe it was the CEO) who overhyped the thing way, way, way too much

and I really agree with Aaronson when he just hammered into how bad this was

@dmckee Can you please join me in the second chat?

Mithrandir24601

But a year or two ago, this changed and suddenly, D-Wave is no longer overhyping as much. Since this happened, they've also got a lot closer to where classical computers are (for what they can solve) and so, they're not there yet... But they are close

8:40 PM

@Mithrandir24601 what was your visit like? when was it? who did you meet? who was there? etc

Mithrandir24601

And I agree with whoever it was that claimed that D-Wave have now brought the fight to the classical computing people. They have 2000 qubits and are nearly comparible

@vzn Who did I meet - I remember the faces, but not the names :P One person who gave a talk was the CFO (although this was brief)

@Mithrandir24601 "nearly comparable"... general feeling or do you think there is a particular study or experiment that tends to support that?

couple quick questions (you don't need to answer now, but i have to leave soon):

1. when did you start your PhD studies/how far into them are you?

2. Why don't you like Python?

AccidentalFourierTransform

yeah, perhaps we should move on to the next question?

Mithrandir24601

@vzn There was a paper where D-Wave did something faster than a classical computer and it actually took the classical CSs some time to come up with something faster - to me, that was the turning point

8:43 PM

@Mithrandir24601 yes ok there are a lot of papers trying to do benchmarking, if you can point at one you thought was influential/ turning pt itd be great...

3. which realization of quantum computers are you most interested in (superconducting, optical, etc)?

Mithrandir24601

(although I should stress that D-Wave aren't there yet)

@vzn Benchmarking it is a hard thing. I agree with the people at D-Wave who said that D-Wave+classical is better than classical alone essentially

anyway, thank you for doing the AMA; I'll read the rest of the conversation later with interest =)

Mithrandir24601

Not always faster, but e.g. more accurate

(ps the buzzword for all this in the news/ science is so-called "quantum supremacy" in the sense of whether a classical or QC is "faster" aka "supreme")

Mithrandir24601

8:45 PM

@heather Thanks! I'll answer your questions at some point

So there are graphs where classical alone gets down to the best solution slowly, while D-Wave gets nearly there really quickly, at which point, classical can take over to cut the time down considerably

@Mithrandir24601 What language was that actually written in?

Mithrandir24601

@DanielSank Originally in Greek

(John was apparently trying to write something that would appeal to Greek audiences more than the other gospels)

@Mithrandir24601 I have thoughts on that.

@Mithrandir24601 I see.

I had a college roomate who studied classics and was quite a student of theology.

please also talk about your very notable photonic chip work at some pt, maybe QM noise/ weak measurement :) (rats not much time left) :(

Mithrandir24601

@DanielSank At this point, you have to look at the context of what this means and how it affects things :P

8:49 PM

He made a big deal about people arguing over the meaning translations of translations of the bible. Quite interesting, actually.

Mithrandir24601

@vzn I don't have any notable work :P

@Mithrandir24601 Eh?

Mithrandir24601

@DanielSank Oh, as in, thing like 'how did writing for a Greek audience affect what John was writing?'

lol this physics AMA is turning into a religion AMA who would have guessed :o o_O

@Mithrandir24601 ah

Oh woops, are we still in the AMA?

apologies

Mithrandir24601

8:51 PM

We can get back to that later then :P

::shuts up::

Mithrandir24601

@DanielSank I'm good with it, but there's not a lot of time left :/

Is the IBM's quantum experience worthwhile? Do they really run your code on a real quantum computer and how long does it take to get the results?

@dmckee If you're reading this I would really appreciate some help...

AccidentalFourierTransform

user image

^ this question pls

Mithrandir24601

8:52 PM

@ThomasKlimpel Yes, yes, for me (being in the UK and hence running things at night in the USA), <1 second

@ThomasKlimpel Although you can also run it on a simulation, which can also be useful

@Mithrandir24601 its 5 qbits right now right? with plans to upgrade to ... x? did you write any custom code?

AccidentalFourierTransform

also, at some point I'd like to try and guess your real name :-P

Mithrandir24601

@vzn This is a good point to mention stuff I looked at on t-designs :P

So, yes - I simulated and ran some very basic t-designs on it

yep ~5m left on the 1hr, hope everyone can stay later for continued dialog/ fun etc :)

Mithrandir24601

At some point, when I get time, I'll run fully blown 3 designs on it and see what happens :)

8:55 PM

@Mithrandir24601 what is a "t-design"?

Mithrandir24601

I'm actually really, really excited, as calculating gate-set fidelity of 2-designs seems to be intractable classically

@AccidentalFourierTransform How about A. Smart?

AccidentalFourierTransform

lol

Mithrandir24601

@vzn So, you want to test how well you can implement a gate on your shiny new quantum chip

But not just any gate, all the gates

So, how can you do this? Well, 'all the gates' are a continuous set (OK, group) of gates, which, therefore can't be done in a finite time

However, a t-design is a set of gates/circuits that gives the same statistics up to t^th order (more or less) as the continuous group

So, if you want to find the expectation value of running a state through all possible gates, you randomly sample using gates from a 1-design

(not all possible gates at once, but randomly sampling from all possible gates if you had an infinite time)

@Mithrandir24601 Is this randomized benchmarking, or something different?

9:00 PM

@Mithrandir24601 sounds like a big part of future research. ok amazing, thats 1hr already, time flies when youre having fun (or trying to figure out religion...!) everyone is free to stick around, hope Mithrandir can stay, its now open chat. would like to hear from everyone who attended, please let us know any reactions or just say hi :)

Mithrandir24601

@DanielSank It's almost randomised benchmarking. Randomised benchmarking takes a t-design and does the same thing, only implements lots of gates at once (or something like that)

Personally, I view it as the theoretical version of randomised benchmarking, but I may be wrong

The problem with describing a t-design in that way is that it's a mathematical relation

$$\sum_{U\in \mathrm{D}} \left(U^{\dagger}\right)^{\otimes t}\otimes \left(U^{\mathsf{T}}\right)^{\otimes t} = \int_{\mathrm{U}\left(d\right)} \left(V^{\dagger}\right)^{\otimes t}\otimes \left(V^{\mathsf{T}}\right)^{\otimes t} dV$$

Is a t-design

(where D is the t-design)

Probably won't follow this.

Mithrandir24601

Although it gets a bit more complicated when adding noise

At least, not without more discussion of the notation.

more key info not covered from chat logs

Mithrandir24601

9:07 PM

@DanielSank Yeah, it's... 2 pages of explaining things like that to get to the above definition...

Aug 11 at 23:10, by Mithrandir24601

@EmilioPisanty Bristol Quantum Engineering CDT

yeah ok let's forgo the details then.

Ok but I understand that you work on randomized-benchmar-ish stuff.

Which is cool.

Aug 4 at 23:44, by Mithrandir24601

we will apparently have an 8-waveguide universal chip. This is at least 3 qubits, but apparently, there are things you can do to get more qubits from the same number of photons. Again, I don't know if you can do this on a universal chip... IBM actually has 16... I'm at Bristol :)

stahp

Aug 11 at 23:19, by Mithrandir24601

My primary supervisor will be Anthony Laing. One of his post-docs and apparently someone from America that I've never met before will be secondary supervisors

Mithrandir24601

9:08 PM

@DanielSank The basic idea is that U is a unitary, U(d) is the Unitary group in d-dimensions, the integral over that is a badly notated Haar measure

What's $t$?

Mithrandir24601

@vzn Yeah, so I've got more details on this now :) (by the way, 'we' means 'other people at Bristol and not me' :P )

an integer?

Mithrandir24601

@DanielSank yeah - it's a t-design, so for a 2-design, t is 2

WA and Bristol researchers make quantum computing breakthrough cio.com.au/article/599964/…

9:10 PM

ah

So there is some funny way in which a sum over unitaries in the t-design is equal to an integral over all unitaries in $U(d)$.

Mithrandir24601

@DanielSank This is exactly what makes a t-design special :)

Although it scales horribly with t and also badly with dimension

Right so somehow if I want to know about an average over all unitaries, you can get that average by looking only at a discrete subset?

or something

Mithrandir24601

Yes! Exactly!

okey dokey

Mithrandir24601

@DanielSank the smallest 2 dimensional 2-design size is 10. The Clifford group [modulo phases...] is a common 3 design and the Paulis are a common 1 design

and a t-design is also a t-1 design

9:13 PM

Ah.

Wait, what?

oh

ok

@AccidentalFourierTransform can you update the meta post to add this to the full list of talks? youre so good at it :) physics.meta.stackexchange.com/questions/7783/…

AccidentalFourierTransform

sure

@DanielSank does Jess Riedel (TBD AMA date) have a SE login?

@vzn I dunno. Ask him.

oops see his ID linked on post. anyway any news on that one? think maybe just take it off meta post for now, its been around on there so long :|

9:16 PM

@vzn lol, I did that the last two times :P

Mithrandir24601

@vzn So, we have an 8-waveguide (3 qubit) universal chip. This will most likely get bigger as time goes on. Bristol also has a 2 qudit chip with some large number of dimensions

facepalm

@vzn What benefit is there to removing it?

@ACuriousMind thx so much :) didnt seem like mods were all into this AMA thing sometimes :|

AccidentalFourierTransform

he's a mod, but he's also a user

@DanielSank its been on there for months, has he even visited chat? this is the "recruitment challenge"...

AccidentalFourierTransform

9:18 PM

he protec, but he also attac

3

this chat is a meme

half the people can't into memes though

Mithrandir24601

And finally(?) @heather - I started my PhD studies about a year ago (OK, 11 months). I'll be starting my actual PhD research in about a month (the stuff I've done so far are just small projects - I'm hoping to get a paper out of the t-design stuff at some point though :) )

AccidentalFourierTransform

I should find a message by ACM helping someone, and then another one being harsh to someone

@AccidentalFourierTransform sounds like an advertisement for...? :P

AccidentalFourierTransform

the latter should be easy to find

9:20 PM

I know how to trigger him

Mithrandir24601

Essentially, python is slow and a scripting language, not a programming one

@ACuriousMind Germans like algebra because they're bad at math

@AccidentalFourierTransform lately 9/10 written to me would be the latter :P aieee o_O

Mithrandir24601

(though I just don't like it for some reason - just looking at it puts me off it)

AccidentalFourierTransform

@Mithrandir24601 what about the name thing? may I guess? its probably something with a "J"

also, have you read Notre-Dame?

Mithrandir24601

9:21 PM

@AccidentalFourierTransform Nope and nope

AccidentalFourierTransform

:-(

@AccidentalFourierTransform you should do a three panel c meme

Mithrandir24601

(as in, you can guess, but it's not 'J')

something algebraic geometry...stack?

he also mod the stac

@Mithrandir24601 thx again that was entertaining + great, there was so much left to cover! didnt even get into why you dont like python :P

AccidentalFourierTransform

9:22 PM

@Mithrandir24601 well, are you a he or a she?

Mithrandir24601

@heather Optical (continuous variable because it's absurdly promising and other optical stuff is just interesting, although not quite as promising to my mind) and superconducting

@AccidentalFourierTransform He - I'm the guy sitting in the corner drinking tea. I always have tea :)

AccidentalFourierTransform

then it's Noah

Mithrandir24601

@vzn Some other time :P

@AccidentalFourierTransform nope

AccidentalFourierTransform

well is it even here: mumsnet.com/baby-names/most-popular-irish-baby-names

@ACuriousMind Is the AMA still on officially?

Mithrandir24601

9:27 PM

@AccidentalFourierTransform I'll make this a little easier - it's none of those names

AccidentalFourierTransform

then I give up

Mithrandir24601

@vzn Thanks! I'm going to make dinner now (It's nearing 11pm...). I'm generally around quite a bit and willing to answer questions :)

AccidentalFourierTransform

later alligator

@Mithrandir24601 I'd like to hear the answers to my weak measurement and PT questions some time in the future ;)

Mithrandir24601

@ACuriousMind Yeah, they were really good questions too - not right now, but sometime, definitely!

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