Re Quantum computers will never overcome noise issues?

["Dave Farber" <dave () farber net>]

---------- Forwarded message ---------
From: Joe Touch <touch () strayalpha com>
Date: Fri, Feb 9, 2018 at 9:13 AM
Subject: Re: [IP] Quantum computers will never overcome noise issues?
To: David Jack Farber <dave () farber net>
CC: ip <ip () listbox com>


Hi, Dave,

IMO, the biggest impediment is scale.

There have been many quantum computers announced with increasing numbers of
qubits - but those announcements are misleading, IMO.

An 8-qubit computer solves 8-bit problems instantly only when all 8 qubits
are completely entangled with each other. Large quantum computers typically
involve many small quantum computers interconnected classically - and those
interconnections destroy the quantum coherence and entanglement that gives
quantum computing its edge.

Not that I disagree with the noise issue, but even if that’s solved,
there’s a scale issue too.

Joe

On Feb 8, 2018, at 5:06 PM, Dave Farber <dave () farber net> wrote:


---------- Forwarded message ---------
From: Allen <allenpmd () gmail com>
Date: Thu, Feb 8, 2018 at 1:28 PM
Subject: [Cryptography] Quantum computers will never overcome noise issues?
To: Crypto <cryptography () metzdowd com>


Gil Kalai, a mathematician at Hebrew University, believes quantum
computers will never be able to overcome noise issues. See article at:

https://www.quantamagazine.org/gil-kalais-argument-against-quantum-computers-20180207/

Any thoughts on this?
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