There's a revolution underway in astronomy. In fact, you might say there are several. In the past ten years, exoplanet studies have advanced considerably, gravitational wave astronomy has emerged as a new field, and the first images of supermassive
But as they indicated in their study, classical interferometry is still hindered by several physical limitations, including information loss, noise, and the fact that the light obtained is generally quantum in nature . By addressing these limitations, VLBI could be used for much finer astronomical surveys.
When applied to VLBI, said Huang, it will allow for efficient and selective population transfers between quantum states without suffering from the usual issues of noise or loss. "To mimic a large optical interferometer, the light must be collected and processed coherently, and we propose to use quantum error correction to mitigate errors due to loss and noise in this process.
Each share pre-distributed entanglement and contain"quantum memories" into which the light is captured, and each prepare its own set of quantum data into some QEC code. The received quantum states are then imprinted onto a shared QEC code by a decoder, which protects the data from subsequent noisy operations.
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