3 ms·
I shudder to think of the difficulty in maintaining phase coherence at optical wavelengths for the baselines they mention in this article.
by gmkiv 5y ago
I shudder to think of the difficulty in maintaining phase coherence at optical wavelengths for the baselines they mention in this article.
- macawfish 5y agoThe perseverance of scientific obsession must not be underestimated.
- disgruntled101 5y agoThe optimism of scientific publications likewise
- _Microft 5y agoIt is also amazing how the right amount of curiosity, ingenuity and spirit can create opportunity for insight.
- krastanov 5y agoThere are already some crazy light sources with line width of less than a single Hz (not a typo) https://www.news.ucsb.edu/2019/019332/quiet-light https://www.news.ucsb.edu/2019/019332/quiet-light Still other work to be done, and worrying about what happens in the fibre optics, but it is becoming possible, especially if the coherence does not need to be long lived.
- deleted 5y ago[deleted]
- _Microft 5y agoThey 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 https://arxiv.org/abs/2012.14605 (Earlier article from 2015 about this storage technique: https://newatlas.com/quantum-encryption-storage-drive/35553/ https://newatlas.com/quantum-encryption-storage-drive/35553/ )
- gmkiv 5y agoThe 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.