About
Local measurements offer a powerful way to probe novel quantum phenomena, thermalization, and universal distributions in many-body quantum systems. In this talk, I will introduce the observable-projected ensemble, in which the subsystem state is conditioned on the outcome of measuring a single local Hermitian operator on part of its complement, rather than on a complete projective measurement of the whole complement. This protocol avoids the exponential complexity of conventional projected ensembles while remaining analytically tractable. I will discuss how its k-th moments compare with those of the Haar ensemble and show that, rather than approaching the Haar ensemble, the observable-projected ensemble can become exponentially distinguishable from it as the bath size grows. I will also describe its field-theoretic formulation in critical systems and illustrate the construction with the free compact boson.
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The talk
Credits and licence
- Institution
- CERN
- Speaker
- Sara Murciano
- Year
- 2026
- Language
- English
- Source
- CERN
- Licence
- CERN, as CERN states it. CERN's terms
- Attribution
- © CERN. CERN provides its audiovisual media free of charge for educational and informational use, credited to CERN; this lecture is shown in CERN's own player.
- Who can watch
- CERN gives no rating. Invisible Network shows it to Teens profiles and older, judged from what the source says about it. How courses are placed