Quantum entangled-photon Chinese satellite.
arpspoof at protonmail.com
Thu Sep 1 18:40:45 PDT 2022
------- Original Message -------
On Thursday, August 25th, 2016 at 9:35 AM, jim bell <jdb10987 at yahoo.com> wrote:
> From: Georgi Guninski <guninski at guninski.com>
> On Thu, Aug 04, 2016 at 02:22:05AM +0000, jim bell wrote:
>>> China to launch unbreakable quantum spy satellite - and it could one day lead to a megascope the size of Earth that could 'spot a license plate on Jupiter's moons'
>>China (Austria is also involved) launched this on 16 August 2016:
>>Also in many news.
> When I originally posted this, I briefly noted that I had a problem with this
> news item. As I recall, one of the problems was that they referred to this
> 'megascope', without explaining the connection. It was as if two high-tech
> articles collided, and bounced off each other, leaving a bit of detritus on
> the other.
> What does this quantum link have to do with building a super telescope? The
> article was less than even unclear: It was totally silent on that matter.
> Currently, the largest single-lens telescope mirrors are made in a rotating
> furnace in Arizona, about 8.5 meters in diameter. the purpose of the
> rotation is to make them very close to the idea curvature from the beginning,
> rather than polishing them out of a flat blank of glass as was the previous process.
> Other telescopes are going to use multiple-mirrors to increase the light-collecting
> area. That's important, but another factor is that the larger effective diameter
> of a telescope mirror, the smaller angular difference that can be imaged. I
> recall a data point: A 4.5 inch mirror has a resolution of about 1 second of arc.
> (defined, I think, as a line/space pair, not merely a line.)
> A telescope based on an 8.5 meter lens will have, ideally, a resolution of 0.0134
> arc seconds. Combine seven of them subtending a larger-diameter, and you'd
> get perhaps 3 times the diameter, and one third the angular resolution: About
> 0.00448 arc seconds. https://en.wikipedia.org/wiki/Giant_Magellan_Telescope
> Would it be possible to 'mount' three such 8.5 meter mirrors in an array where they
> are millions of kilometers away from each other, and somehow combine their images
> and to produce and preserve the resolution of the larger diameter? It wouldn't multiply
> light-gathering ability, but it would increase the angular resolution immensely, perhaps by
> a factor of 100 million to one billion.
> I speculate that this is what is being alluded to in the article's reference to a 'super telescope'.
> It would not be sufficient to merely detect the images generated by each mirror; somehow
> it would be necessary to combine the light signals to include phase information. Perhaps this
> could be done by some sort of quantum process.
> Jim Bell
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