back to article Micro-drum acts as quantum memory

Memory is one of the difficult bits of quantum computing. For example, while the polarisation of a photon encodes a quantum state, it's very difficult to get photons to stay where they're put. A group of researchers from JILA – a joint institute between the University of Colorado and the National Institute of Standards and …

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COOL!

Cool! Drum memory is coming back.

Next, we'll get DEC and IBM platter drums to insert...

Back to the Bat Mobile spin-up. Or the washing machine, depending on vendor...

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Re: Quantum Geek Talk

<long instructive post>

And this is why Eadon remains off my ignored commentards list.

For now.

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Re: Quantum Geek Talk

"it's very difficult to get photons to stay where they're put"

Have they tried sticky tape?

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Re: Quantum Geek Talk

> it it's not the same photon from one moment to the next

There is however clearly a big misunderstanding of what a photon "is". There is no continuity here, a photon wanders around as much as a bank transaction does. Photon is just the information extracted from the electromagnetic field.

> classical mechanics system that "remembers" quantum mechanical events

Well, that's not possible that's why there is this distinction.

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Happy

Oh it's pretty easy to explain...

Either it works, gets more work on it, or we buy some thing else and either come back to it when it does work or we ignore it completely forever.

This is Fizzicks for you.

Elemental my dear Plank.

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Happy

Spinning platters

There is just no way of escaping them

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Re: Spinning platters - Yum

... made me think of pancakes.

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choice of wavelength dictates size

The example of the platter include the resonant antenna and is about 150 microns square. It's visible to the naked eye!

Without going to plasmons (surface electrons that can transform from and to photons (with a loss of linked quantum uncertainty-entanglement) it is difficult to see this system getting smaller and therefor sets serious limits on the performance of a quantum computer using this form of storage.

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Re: choice of wavelength dictates size

"The example of the platter include the resonant antenna and is about 150 microns square. It's visible to the naked eye!"

Would that not tend to depend on the frequency of the exciting radiation?

It's not mentioned in the article other than being "microwave," but that covers a pretty broad range. Then you could switch to light instead.

This is proof of concept tech. They probably designed it to use whatever hardware they already had. IIRC 2.4Ghz (microwave oven) and 10GHz seem to be popular frequencies for this but microwaves go up to the 100s of GHz before getting into the borderline THz and quasi optical methods.

This is starting to look a bit more like a digital quantum computer than some kind of analog device for solving a fixed class of problems.

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didn't understand a word of it!

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