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Team from ETH Zurich make high quality quantum swap gate using a geometric phase

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Re: Team from ETH Zurich make high quality quantum swap gate using a geometric phase

#51

Post by ktallett »

wasabi991011 wrote: post #48
ktallett wrote: post #46

I am of the view the 17000 is simply referring to once they had the system set in the final stage they are happy with. They ran 17000 qubits through it over the course of testing and it led to a fidelity of 99%. Which is useful as fidelity is important, although this still isn't accurate enough, but it is no where near programmable general quantum computer.

They had something like 58000 atoms in their lattice and managed to form 17000 qubits from atom pairs. Pretty impressive already yeah, I'm sure either their team or another research team will try to improve the qubit yield. Increasing the atom count could be harder though, I'm not an expert but at some point you run into limits from the size of your lab/cooler/trap. And yeah 99.9% fidelity is not anything groundbreak…

It will be very challenging to implement their system off this paper as there are many key experimental details missing. I won't get into my hatred of this but open methodology is sorely needed in QC and it really hampers speed of development across the whole sector. As you say you will run into limitations eventually but again hard to judge where those limitations are.

Re: Team from ETH Zurich make high quality quantum swap gate using a geometric phase

#53

Post by gerdesj »

cbg0 wrote: post #37
gerdesj wrote: post #33

Earlier quoted context omitted.

I went to school in Oxfordshire in the '80s. Some visiting profs from JET joked that fusion was 25 years away then.

Back then things were centered around "can we even do this?" and now it's more of "how do we keep this running more than 5 minutes?".

My impression back then from those profs was that it (fusion) would be inevitable but you do have to think long term, really long term. I'm old enough now (55) to understand that mentality.

I'd put money on something useful fusion related happening within the next 10 years or perhaps 20. I'm not up on the current state of experiments etc but it will happen.

AGI? - lol!

Re: Team from ETH Zurich make high quality quantum swap gate using a geometric phase

#55

Post by dathinab »

ktallett wrote: post #47
dathinab wrote: post #32

things are speeding up dangerously sure this isn't a 17k qubit quantum computer, but it's a step in that direction and this isn't the only news falling under "this is moving faster then expected" just one in many which scream "time to take it serious, deadline 2029 try earlier" --- a year or so(?) ago some investments happened, which made only sense if there had been some unpublished break through in quantum computer…

There are so many steps in quantum computing but there is nothing of note to suggest that we can get anywhere near building a device that outperforms HPC's at this stage.

you seem to have a misunderstanding about how quantum computing works

it isn't "faster" computing

it is "different" computing

like if you make a diagram left side "things computers can do fast", right side "thinks they can't do fast", then quantum computers are like a oval in the middle covering part of both sides

as consequence weather it "outperforms" HPC (in general) is fully meaningless, it likely won't ever do that, but also still will break cryptography anyway

and in general it's commonly used in conjunction with HPC, not as a replacement of it

quantum computers working "different" instead of "faster" is also why we won't see a slow breaking/reducing of cracking time for asymmetric crypto. Because it isn't a slow buildup of speed. It's a overcoming of technical barriers. Once done breaking RSA/ECC on a 128 bit security level will pretty much instantly jump from "infeasible per key" to "in minutes per key".

this is also why even "just" a chance of idk. arbitrary chosen 30% that it will be possible in 2030 would be too much to ignore it... especially if we consider that most computer security out there is coupled to asym. crypto not breaking in one way or another.

Re: Team from ETH Zurich make high quality quantum swap gate using a geometric phase

#56

Post by sigmoid10 »

foobar10000 wrote: post #26
sigmoid10 wrote: post #6

Earlier quoted context omitted.

It is still orders of magnitude away from breaking RSA 2048 even under the most optimistic assumptions. And qubits double waaay slower than transistors so far.

AES128 / Grover?

Still requires thousands of logical qubits, which would correspond to millions of physical qubits. And this machine isn't even fully there for the physical qubit part. It's like the first step to physical qubits.

Re: Team from ETH Zurich make high quality quantum swap gate using a geometric phase

#57

Post by api »

gerdesj wrote: post #53
cbg0 wrote: post #37

Earlier quoted context omitted.

Back then things were centered around "can we even do this?" and now it's more of "how do we keep this running more than 5 minutes?".

My impression back then from those profs was that it (fusion) would be inevitable but you do have to think long term, really long term. I'm old enough now (55) to understand that mentality. I'd put money on something useful fusion related happening within the next 10 years or perhaps 20. I'm not up on the current state of experiments etc but it will happen. AGI? - lol!

AFAIK superconductors are a major limiting tech. But we are slowly getting better ones, both by discovering more and by learning to mass produce superconducting wire.

With superconductors you can make magnetic bottles.

There’s also some interesting inertial confinement work happening. There the limiter is both confinement and the efficiency of the driver. Look up MagLIF for a hybrid magnetic inertial approach under study.

Re: Team from ETH Zurich make high quality quantum swap gate using a geometric phase

#58

Post by taskforcegemini »

HenryMulligan wrote: post #39
dwd wrote: post #35

Earlier quoted context omitted.

Now now or Just now? * I've worked with too many Sth Africans.

For those of us who aren't familiar, what is the difference?

most of them live in a different time zone

Re: Team from ETH Zurich make high quality quantum swap gate using a geometric phase

#59

Post by snthpy »

SideQuark wrote: post #8
snthpy wrote: post #5

For real? I wouldn't have thought so many would be possible so soon. Might actually need to look into quantum computing again after 20 years.

They did not make a 17000 qubit computer. The qubits were not controllable or general in any way. The paper is linked, look at it. This title is misleading.

Thanks for the clarification.

Re: Team from ETH Zurich make high quality quantum swap gate using a geometric phase

#60

Post by snthpy »

sigmoid10 wrote: post #6
snthpy wrote: post #5

For real? I wouldn't have thought so many would be possible so soon. Might actually need to look into quantum computing again after 20 years.

It is still orders of magnitude away from breaking RSA 2048 even under the most optimistic assumptions. And qubits double waaay slower than transistors so far.

Thanks. What order of magnitude qbits would be needed for RSA 2048?
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