Superconducting Quantum Computing Without Entanglement?

Foundations of physics and/or philosophy of physics, and in particular, posts on unresolved or controversial issues

Superconducting Quantum Computing Without Entanglement?

Postby Q-reeus » Sat Feb 24, 2018 8:56 pm

Pardon please if this is old news but just came across: https://arxiv.org/abs/1408.5410
Joy - given how long that proposed experiment of yours has been on ice now, maybe contact one or both of those gents and find out how their proposal has fared since.
Please report back any response.
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Re: Superconducting Quantum Computing Without Entanglement?

Postby Joy Christian » Sat Feb 24, 2018 10:18 pm

***
Thanks, Q-reeus. I didn't know about this paper. The authors write:

Such an observation could undermine the assumptions of superposition and entanglement, bringing into question the foundation and the ultimate performance of a universal digital quantum computer.

As for my proposed experiment, there isn't enough political will in the community to take a risk of actually performing it. The will of the community is in investing literally billions of dollars in the dream of quantum computers.

***
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Re: Superconducting Quantum Computing Without Entanglement?

Postby Q-reeus » Sat Feb 24, 2018 11:08 pm

Joy Christian wrote:***
Thanks, Q-reeus. I didn't know about this paper. The authors write:

Such an observation could undermine the assumptions of superposition and entanglement, bringing into question the foundation and the ultimate performance of a universal digital quantum computer.

And the same authors proposed a different experiment probing entanglement-or-not, involving single-photon measurements:
https://arxiv.org/abs/1407.2605
Less clear to me what could really be inferred from any results there.
As for my proposed experiment, there isn't enough political will in the community to take a risk of actually performing it. The will of the community is in investing literally billions of dollars in the dream of quantum computers.

No question in my mind bandwagon effect is the reality for so much of establishment science. On a different tangent, the brilliant Laszlo Kish et. al. has shown that robust, practically attainable exponential speedup can very likely be had via clever use of the very thing QC crowd strive extremely hard to avoid - noise!:
https://arxiv.org/abs/1408.4077
https://en.wikipedia.org/wiki/Noise-based_logic
Practically demonstrated years ago noise-based secure communications that beats quantum cryptography, and at a tiny fraction of the cost:
https://engineering.tamu.edu/electrical ... lkish.html
But, the bandwagon effect means such breakthroughs are sidelined in favour of the 'sexier' well-funded quantum comms/computing industry juggernaught.
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