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IBM unveils 127-qubit quantum processor

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Re: IBM unveils 127-qubit quantum processor

#251

Tangential question, what are the areas of technology where we can expect to see substantial progress or breakthroughs within 2030, i.e. what are the most exciting areas to follow and look forward to? Here's my list: - Nuclear fusion (Helion, ZAP, TAE, Tokamak Energy, CFS, Wendelstein). - Self-driving cars. - New types of nuclear fission reactors. - Spaceflight (SpaceX Starship). - Supersonic airplanes (Boom). - Soli…

Non animal food. Will transform land use.

Remote education. Available to any kid or adult anywhere.

Re: IBM unveils 127-qubit quantum processor

#252

Quantum Computers sitting in their cryogenic chambers are such works of art, stacks of giant brass plates and hundreds of heat pipes (or coolant pipes? liquid helium I suppose) twisted and coiling throughout the structure hanging like some steampunk chandelier (why do they hang from above anyway?) EDIT: changed to a few direct links to pics: [0][1][2] The esoteric design reminds me of the Connection Machine blog post…

Are there any pictures of the hand-wired LISP Machine online? I searched, but couldn't find it. Also - when LISP was invented (1958) - what was the state of computers at the time? Doing some research - it seems like direct keyboard input to computers was only available for 2 years prior. It seems like languages were decades ahead of hardware. I guess I'm having trouble fathoming how languages were so far ahead while…

I can't give you a great answer because I wasn't there, but I did find a John McCarthy paper describing its usage by way of an automatic typewriter [0] as referenced by the wiki on Lisp [1], first implemented via punchcards on the IBM 704. That would be vacuum tube logic and magnetic core memory. ~19,000 pounds, 12k flops (36bit), 18kB of RAM, 3.75-ish Megabytes of storage per 2,400 feet of mylar tape. [2]

As for languages ahead of the hardware, you might read up about Charles Babbage and Ada Lovelace, the latter a mathematician who translated problems into machine instructions for a machine that wouldn't be built for a hundred years - Babbage's design worked, but he spent all the money the Royal Society was willing to give trying improve the tolerances on his logical-clockwork. [3] But anyway, back to John McCarthy's paper, last page:

  APPENDIX - HUMOROUS ANECDOTE
The first on-line demonstration of LISP was also the first of a precursor of time-sharing that we called “time-stealing”. The audience comprised the participants in one of M.I.T.’s Industrial Liaison Symposia on whom it was important to make a good impression. A Flexowriter had been connected to the IBM 704 and the operating system modified so that it collected characters from the Flexowriter in a buffer when their presence was signalled by an interrupt. Whenever a carriage return occurred, the line was given to LISP for processing. The demonstration depended on the fact that the memory of the computer had just been increased from 8192 words to 32768 words so that batches could be collected that presumed only a small memory.

The demonstration was also one of the first to use closed circuit TV in order to spare the spectators the museum feet consequent on crowding around a terminal waiting for something to happen. Thus they were on the fourth floor, and I was in the first floor computer room exercising LISP and speaking into a microphone. The problem chosen was to determine whether a first order differential equation of the form M dx + N dy was exact by testing whether ΔM/Δy = ΔM /Δy, which also involved some primitive algebraic simplification. Everything was going well, if slowly, when suddenly the Flexowriter began to type (at ten characters per second) “THE GARBAGE COLLECTOR HAS BEEN CALLED. SOME INTERESTING STATISTICS ARE AS FOLLOWS:” and on and on and on.

The garbage collector was quite new at the time, we were rather proud of it and curious about it, and our normal output was on a line printer, so it printed a full page every time it was called giving how many words were marked and how many were collected and the size of list space, etc. During a previous rehearsal, the garbage collector hadn’t been called, but we had not refreshed the LISP core image, so we ran out of free storage during the demonstration.

[0] http://jmc.stanford.edu/articles/lisp/lisp.pdf

[1] https://en.wikipedia.org/wiki/Lisp_(programming_language)

[2] https://en.wikipedia.org/wiki/IBM_704

[3] Jacquard's Web by James Essinger is the book you want to read for more.

Re: IBM unveils 127-qubit quantum processor

#253

Quantum Computers sitting in their cryogenic chambers are such works of art, stacks of giant brass plates and hundreds of heat pipes (or coolant pipes? liquid helium I suppose) twisted and coiling throughout the structure hanging like some steampunk chandelier (why do they hang from above anyway?) EDIT: changed to a few direct links to pics: [0][1][2] The esoteric design reminds me of the Connection Machine blog post…

Are there any pictures of the hand-wired LISP Machine online? I searched, but couldn't find it. Also - when LISP was invented (1958) - what was the state of computers at the time? Doing some research - it seems like direct keyboard input to computers was only available for 2 years prior. It seems like languages were decades ahead of hardware. I guess I'm having trouble fathoming how languages were so far ahead while…

Photos are indeed sparse, here's the highest-res I could find of the machine I saw at the museum (built 1979, much more compact now that we can forego the vacuum tubes), thankfully there are enough pixels to read the post-it note naming the machine "Marvin": https://upload.wikimedia.org/wikipedia/commons/7/7d/MIT_lisp...

Re: IBM unveils 127-qubit quantum processor

#254
post #149
post #139

Earlier quoted context omitted.

Cray supercomputers were also aesthetically beautiful machines: https://cdn.britannica.com/11/23611-050-81E61C8A/Cray-1-supe... So happy to be able to find a picture of the wirewrap inside: https://s-media-cache-ak0.pinimg.com/originals/e2/d2/47/e2d2...

The computer history museum has a CRAY you can see very close ( https://computerhistory.org/ ). Worth the visit.

At the 1990 TeX Users Group meeting at Texas A&M University, one of the events was a tour of the computer center where we got to be in the room with their Cray. I think I sat on the bench.

Re: IBM unveils 127-qubit quantum processor

#255

Quantum Computers sitting in their cryogenic chambers are such works of art, stacks of giant brass plates and hundreds of heat pipes (or coolant pipes? liquid helium I suppose) twisted and coiling throughout the structure hanging like some steampunk chandelier (why do they hang from above anyway?) EDIT: changed to a few direct links to pics: [0][1][2] The esoteric design reminds me of the Connection Machine blog post…

I was lucky enough to tour the IBM Thomas J. Watson Research Center in New York a few months ago and captured several sound recordings of this[0] room housing a quantum computer. Not only do they look cool, they sound very intense! [1] A stark contrast to the minimalist/austere design of the actual enclosure, or maybe it's fitting, depending on your perspective... [0] https://www.ft.com/__origami/service/image/v2/ima…

Yep, definitely the sound of an AI actively hijacking my brain D: thanks

Re: IBM unveils 127-qubit quantum processor

#256
post #249

Earlier quoted context omitted.

Yes.

Care to elaborate? :P What are you programming? Which languages? I'm keen to learn more!

There are a lot of languages. I use Python. Right now I'm working on a project using the Pennylane library for quantum machine learning. Other languages exist – dedicated ones like Q# or quipper (built on top of Haskell) or libraries in Julia, C++, etc.

One paradigm, variational quantum algorithms (part of the broader class of hybrid quantum-classical algorithms), has several similarities to classical deep learning. The approach can be summed up as:

1. Construct a parameterized quantum circuit – one where the quantum gates are controlled by real-valued parameters. Ideally this circuit is one you think could reasonably solve some problem based off of your knowledge of the problem, input data, and behavior of quantum information.

2. Define an objective function.

3. Iteratively adjust the circuit parameters. This is done by measuring the output of the circuit and using that information in conjunction with some optimization function (e.g. stochastic gradient descent).

In general terms, I'm working on QML algorithms that may some day be used for applications in biology and medicine.

For a serious discussion of the approach, see: https://www.nature.com/articles/s42254-021-00348-9

There's also several nice walkthroughs of the basics on Pennylane's website: https://pennylane.ai/qml/demos/tutorial_variational_classifi...

Re: IBM unveils 127-qubit quantum processor

#257
post #202

Earlier quoted context omitted.

In that sense, this is a pretty big step because for the first time there is a quantum computer that cannot be simulated by a classical one. It's also expected they will have a processor with over 400qubits next year and over 1000 in 2 years. This are huge leaps. Still they aren't currently doing anything useful and need to prove themselves.

I am surprised to see that growth given my intuition that each additional qubit would be harder than the previous to add to the system. Are there any moores law type predictions/historical trackers for qubits?

My understanding is that adding qubits is not hard, but using them together is hard. Also, it sounded like some qubits are only added for error correction.

Re: IBM unveils 127-qubit quantum processor

#258
post #3

> IBM Quantum System Two is designed to work with IBM's future 433-qubit and 1,121 qubit processors. what's the smallest useful (as in, 'non-toy', or maybe 'worth buying time on') quantum computer?

If you are a researcher from another field that just wants to contract out the computation of a numerical solution to some chemistry problem infeasible on a classical supercomputer, a million "physical" qubits is a fairly reasonable guestimate. If you are a quantum computation person developing near term applications, you probably would already start getting excited with a 100 (sufficiently long-lived) qubits. The "s…

>a million "physical" qubits is a fairly reasonable guestimate.

...

>If you are a quantum computation person developing near term applications, you probably would already start getting excited with a 100 (sufficiently long-lived) qubits.

...

>"logical qubit" or less formally "long-lived qubit" ... With 100 logical qubits (i.e. 100k physical qubits)

lol you're literally guilty of playing the same trick that people are bemoaning in another thread.

incidentaly, having taken a QC systems class from Fred Chong, i believe you guys are all working on vaporware.

Re: IBM unveils 127-qubit quantum processor

#259

Quantum Computers sitting in their cryogenic chambers are such works of art, stacks of giant brass plates and hundreds of heat pipes (or coolant pipes? liquid helium I suppose) twisted and coiling throughout the structure hanging like some steampunk chandelier (why do they hang from above anyway?) EDIT: changed to a few direct links to pics: [0][1][2] The esoteric design reminds me of the Connection Machine blog post…

The TV show DEVS has a computer that looks a lot like those first three links. I always thought their prop was a set designer's imagination run wild, not actually based in what quantum computers look like.

Some additional information on ³He/⁴He dilution refrigeration that makes up the chandelier: https://en.wikipedia.org/wiki/Dilution_refrigerator

Re: IBM unveils 127-qubit quantum processor

#260

Earlier quoted context omitted.

I am all in for down votes. I am not a physicist but the cost of cooling must astronomical for the output you get. CF. When autonomous vehicle technology gets released into production it is likely they won't make your car look like its wearing a dunce's hat whereas when quantum computers enter production we will still need mK temperatures for them to operate. The cost of cooling will burn the planet up further, just…

There are technologies that would not need the 15mK operating temperatures, they are just in their infancy. The most interesting applications of quantum computing have little to do with encryption or breaking codes. Chemistry and optimization problems are much more exciting. SHA-256 is a hash, not an encryption algorithm. And quantum computers have nothing to contribute to reversing hashes or breaking symmetric encry…

While I don't doubt that advances are being made, this has the hallmarks of cold fusion all over again. By the time it is in production, DeepMind will have made significant head way using conventional CPU/GPU.
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