‘Nobody thought it was possible’: Quantum teleportation is here through existing networks.

ZephirAWT · 2024-12-22T06:13:49+00:00

‘Nobody thought it was possible’: Quantum teleportation is here through existing networks. To test this, they then set up a 30km (18.6 mile)-long fibre optic cable with a photon at either end and then sent both regular Internet traffic and quantum information through it.

Was it really so difficult to imagine? So far most of long-distance "quantum teleportation" experiments has been made with standard industrial optical cables, i.e. it's sender and receiver what makes such a transmission "quantum", not the cable/environment itself. 30 km is usually largest distance which allows transmission of optical information through cable without repeater, which makes the above announcement merely a hype of problematic technological value. I even don't think that such a transmission is actually quantum, it just maintains polarization of photons during their spreading through optical cable, which is not so difficult to achieve today at moderate distances.

ZephirAWT · 2024-12-28T05:10:31+00:00

Nicolas Gisin: Indeterminism in physics and intuitionistic mathematics Intuitionist mathematics is the idea that the entire discipline of maths is a mental construct based on human thought rather than a platonic realm of eternal truths. According to physicist Nicolas Gisin, one of this idea’s biggest proponents, that maths is based on human intuition is the reason why quantum mechanics seems so strange. In 1995 Gisin transmitted a quantum cryptographic signal at a distance of 23 km over a commercial optical fiber under Lake Geneva. Later, his group extended this record to 67 km and 307 km using Plug-&-Play and Coherent One Way configurations for quantum key distribution.

The Gisin's idea is a bit dual to the above insight, that the indeterminism of Newtonian mechanics can be removed by consideration of deterministic background. Gisin notes that quantum mechanics only looks indeterministic, because it's using deterministic initial conditions. When these conditions are replaced with indeterminist physical ones, then the quantum mechanics changes into a determinist theory. See also:

Nicolas Gisin on intuitionism, indeterminacy, quantum gravity Gisin says that we have erroneously used the platonic ideals of mathematics, rather than sticking with the ones that we can actually construct ourselves. Because the past that we have already seen, we have called the mathematics into existence, but the future hasn’t yet been constructed. In indeterministic physics the future is open, in sharp contrast to the block universe view). Consequently, statements and propositions about the future need not be either true or false.
This Physicist Says We’re Using Maths Entirely Wrong: "I don’t see how Gisin’s idea is even well-defined..."

ZephirAWT · 2025-01-08T07:40:17+00:00

First-ever mechanical qubit with a long lifespan created on sapphire crystal: This mechanical qubit comes with 200 microseconds of coherence time, twice that of a superconducting qubit.

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