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A comment on Quantum astronomy could create telescopes hundreds of kilometers wide. Parent comment

Re:Quantum astronomy could create telescopes hundreds of kil... by _Microft on Wednesday April 21, 2021 @02:17AM (#26885984)
They want to store the state of received photons on „quantum harddrives“, transport them to the same place, read the states out and let them interfere locally.

This is the mentioned paper from december 2020 about hour-long optical storage (by Chaun-Feng Li et al.):

https://arxiv.org/abs/2012.14605

(Earlier article from 2015 about this storage technique: https://newatlas.com/quantum-encryption-storage-drive/35553/ )

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Re:Quantum astronomy could create telescopes hundreds of kil... by gmkiv on Wednesday April 21, 2021 @10:43AM (#26890292)
The state (phase) of the received photon will depend on the position of the receiver. Even if you have a perfect quantum hard drive, you still need to maintain the position of your receivers to within a wavelength. That will be hard to do if they are separated by a long distance.
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