The Hilbert Space Post

The Hilbert Space Post

hilbertspacepost.bsky.social

Sharing the latest developments in the world of quantum science. I am not a bot. In the real life, I am Adrien Devolder (https://www.linkedin.com/in/adrien-devolder-692b7a146/), research associate in quantum control at the University of Toronto.

👤 Joined on 22 November 2024

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When everyone decides to post their paper on arXiv on the same day to ensure maximum visibility for their work.

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A quantum computer doesn't give you a probability — it gives you a coin. One run, one bit. To learn the probability you average many shots, and that estimate has spread: sampling noise. Want half the spread? Run 4× as many (it shrinks like 1/√N).

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New episode of The New Quantum Era: Quantum Cameras and Sub-Diffraction Imaging with Johannes Galatsanos

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My view is to start with cheap classical/ML covariances for groupings, update them as early measurement data accumulates (not necessarily at every VQE step, but when the state difference across VQE steps justifies it), and update the groupings to improve the measurement strategy.

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Across the full benchmark, SI-ICS was better than all VarSI-ICS variants in only 5/418 cases, and all used approximate CISD covariances. So, covariance mismatch can hurt, but it was not the dominant behavior in our tests. Of course, the closer you are to the wfn variances on the device, the better

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