Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session A71: Quantum Sensing using Distributed Sensors
8:00 AM–11:00 AM,
Monday, March 6, 2023
Room: Room 407/408
Sponsoring
Unit:
DQI
Chair: Tahereh Rezaei, USC, Information Science Institute
Abstract: A71.00012 : Temperature Estimation of Quantum Environments using Impurity Probes*
10:36 AM–10:48 AM
Presenter:
George Mihailescu
(University College Dublin)
Authors:
George Mihailescu
(University College Dublin)
Steve Campbell
(University College Dublin)
Andrew K Mitchell
(Univ Coll Dublin)
estimation is of foundational importance, it is also crucially relevant in the NISQ era and for many experimental setups. Here we study quantum impurity models as a platform for
quantum thermometry. In particular, we critically assess the thermometric capabilities of an Ising and Kondo impurity probe in different fermionic thermal environments. We find that
the Ising impurity has sensing capabilities independent of the environment being probed, with maximum sensitivity at tunable temperatures, controlled by applied magnetic fields.
However, as with the idealized free qubit probe, the Ising impurity has no thermalization mechanism. By contrast, the more realistic Kondo impurity can thermalize but this same
mechanism necessarily results in entanglement with the environment, thereby lowering thermometric sensitivity. Interestingly, the low-temperature Kondo probe response takes a
characteristic universal form, albeit at the expense of poorer overall sensitivity. Sensitivity in the high temperature regime approaches that of the Ising probe. This suggests that realistic
quantum impurity probes can act as robust and versatile thermometers.
*Equal1 Laboratories.
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