IQP Seminar: Continuous sensing and parameter estimation with the boundary time crystal

by Prof. Igor Lesanovsky (U Tübingen)

Wednesday 5 Jun 2024, 13:30 → 15:00 Europe/Berlin

ZOQ and/or Zoom

Abstract: tbd 

A boundary time crystal is a quantum many-body system whose dynamics is governed by the competition between coherent driving and collective dissipation. It features a transition between a stationary phase and an oscillatory one. The fact that the system is open allows one to continuously monitor its quantum trajectories and to analyze their dependence on parameter changes. This enables the realization of a sensing device whose performance I will discuss as a function of the monitoring time and system size. The best achievable sensitivity turns out to follows the standard quantum limit in time and Heisenberg scaling in the particle number. This theoretical scaling can be achieved in the oscillatory time-crystal phase and it is rooted in emergent quantum correlations. The main challenge is, however, to tap this capability in a measurement protocol that is experimentally feasible. I will show that the standard quantum limit can be surpassed by cascading two time crystals, where the quantum trajectories of one time crystal are used as input for the other one.

[1] A. Cabot, F. Carollo and I. Lesanovsky, Continuous Sensing and Parameter Estimation with the Boundary Time Crystal, Phys.  Rev.  Lett.  132, 050801 (2024)
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The event will take place in the ZOQ seminar room, with a hybrid option.

 

The Zoom data for the entire semester is:

https://uni-hamburg.zoom.us/j/63741118756?pwd=eFNGUFd3Y1Evdjgrd21TVTcwSGhvQT09

Meeting ID: 637 4111 8756
Passcode: 35543995

 

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Upcoming IQP events:

12.6. Herwig Ott, U Kaiserslautern

10.7. Andrea Alberti, MPQ