* Venue | E C G Sudarshan Hall |
* Speaker | Chiranjib Mukhopadhyay |
* Title | Modular quantum many-body sensors |
Affiliation | University of Electronic Sciences and Technology of China, Chengdu 611731, China |
Abstract | Quantum many-body systems undergoing phase transitions have been proposed as probes enabling beyond-classical enhancement of sensing precision. However, this enhancement is usually limited to a very narrow region around the critical point. Here, we systematically develop a modular approach for introducing multiple phase transitions in a many-body system. This naturally allows us to enlarge the region of quantum-enhanced precision by encompassing the newly created phase boundaries. Our approach is general and can be applied to both symmetry-breaking and topological quantum sensors. In symmetry-breaking sensors, we show that the newly created critical points inherit the original universality class and a simple total magnetization measurement already suffices to locate them. In topological sensors, our modular construction creates multiple bands which leads to a rich phase diagram. In both cases, Heisenberg scaling for Hamiltonian parameter estimation is achieved at all the phase boundaries. This can be exploited to create a global sensor which significantly outperforms a uniform probe. Ref.: Phys. Rev. Lett., vol. 133, 120601 (2024). |
* Announcement? | Institute |
* Refreshments? | Before the event |
* Honorarium? | None |
Special Arrangements? | Digital Projection |
* Host name and email | Sibasish Ghosh @@ sibasish@imsc.res.in |