But some argue, the same codes used to prevent errors in quantum computers might give space-time “its intrinsic robustness”:
But in the dogged pursuit of these codes over the past quarter-century, a funny thing happened in 2014, when physicists found evidence of a deep connection between quantum error correction and the nature of space, time and gravity. In Albert Einstein’s general theory of relativity, gravity is defined as the fabric of space and time — or “space-time” — bending around massive objects. (A ball tossed into the air travels along a straight line through space-time, which itself bends back toward Earth.) But powerful as Einstein’s theory is, physicists believe gravity must have a deeper, quantum origin from which the semblance of a space-time fabric somehow emerges.
That year — 2014 — three young quantum gravity researchers came to an astonishing realization. They were working in physicists’ theoretical playground of choice: a toy universe called “anti-de Sitter space” that works like a hologram. The bendy fabric of space-time in the interior of the universe is a projection that emerges from entangled quantum particles living on its outer boundary. Ahmed Almheiri, Xi Dong and Daniel Harlow did calculations suggesting that this holographic “emergence” of space-time works just like a quantum error-correcting code. They conjectured in the Journal of High Energy Physics that space-time itself is a code — in anti-de Sitter (AdS) universes, at least. The paper has triggered a wave of activity in the quantum gravity community, and new quantum error-correcting codes have been discovered that capture more properties of space-time. …
“It’s really entanglement which is holding the space together,” he said. “If you want to weave space-time together out of little pieces, you have to entangle them in the right way. And the right way is to build a quantum error-correcting code.”Natalie Wolchover, “How Space and Time Could Be a Quantum Error-Correcting Code” at Quanta
They certainly make it sound as though our universe is designed.
See also: What becomes of science when the evidence does not matter?
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2 Replies to “We don’t often hear space and time described as a quantum error-correcting code”
This raises two questions
First, we are told that:
Later we are told:
As has been discussed many times here, observation or measurement of quantum particles “collapses” them from many possible but indeterminate states into a single actual state. These “gates” are measuring the quantum states of these particles. They have to know the actual quantum states of these entangled particles before they can know if there is an error to be corrected.
The second question is that to correct an error you have to know in advance what an error is in a given system. In a purposeless universe, what are the quantum-level errors that these correction processes are trying to address?
The trick to not collapsing the wave function is to only collect partial ‘fuzzy’ information with a weak measurement so as to leave the wave function in an indeterminate ‘uncertain’ state.
Quantum error correction is employed to protect the ‘fragility’ of coherent quantum systems