Speaker: Simone Felicetti
Affiliation: Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche CNR-IFN, Roma
Date: Friday, 12 November 2021 at 14:30
Location: Seminar Room, Serrano 121 (CFMAC)
Quantum critical systems in proximity of phase transitions exhibit a divergent susceptibility,
suggesting that an arbitrarily-high precision may be achieved when they are used as probes to estimate a physical parameter. However, such an improvement in sensitivity is counterbalanced by the critical slowing down, which implies an inevitable growth of the protocol duration time [1].
Here, we present sensing protocols based on phase transitions observable in a broad class of quantum optical systems. We show that, in spite of the critical slowing down, critical quantum optical probes can achieve quantum advantage in sensing applications [2,3]. By going beyond the asymptotic regime of parameters [4], we show that Heisenberg-limited precision can be achieved with current quantum technologies. Finally, we propose specific applications for quantum magnetometry and for superconducting-qubit readout.
1. M. M. Rams, P. Sierant, O. Dutta, P. Horodecki, and J. Zakrzewski, Phys. Rev. X 8, 021022 (2018).
2. L. Garbe, M. Bina, A. Keller, M. Paris, and S. Felicetti, Phys. Rev. Lett. 124, 120504 (2020).
3. L. Garbe, O. Abah, S. Felicetti, R. Puebla, arXiv:2110.04144 (2021).
4. R. Di Candia, F. Minganti, K. V. Petrovnin, G. S. Paraoanu, S. Felicetti, arXiv:2107.04503 (2021).
5. P. Krantz, A. Bengtsson, M. Simoen, S. Gustavsson, V. Shumeiko, W. D. Oliver, C. M. Wilson, P. Delsing & J. Bylander, Nat. Comm. 7, 11417 (2016).