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From: David Brown <david.brown@hesbynett.no>
Newsgroups: comp.arch
Subject: Re: Is Intel exceptionally unsuccessful as an architecture designer?
Date: Thu, 19 Sep 2024 20:15:57 +0200
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On 19/09/2024 18:18, MitchAlsup1 wrote:
> On Thu, 19 Sep 2024 9:35:41 +0000, David Brown wrote:
> 
>> On 19/09/2024 09:44, Niklas Holsti wrote:
> 
>> The practical limitations for quantum computers are far more
>> significant.  Roughly speaking, when you entangle more states at once,
>> you need tighter tolerances to maintain coherence, which translates to
>> lower temperatures, higher energy costs, and lower times to do your
>> calculations.  And to be useful, you need large numbers of qubits, which
>> again makes maintaining coherence increasingly difficult.
> 
> One can say exactly the same about PAM4 signaling compared to NRZ or
> even RZ coding.

Yes.  It gets harder to have more signal levels per baud, and you need 
tighter tolerances, shorter lengths, less electrical noise, etc.