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Continuous quantum clock with high precision and long recurrence time

Ramezani, M ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevA.106.022427
  3. Publisher: American Physical Society , 2022
  4. Abstract:
  5. Continuous clocks, i.e., clocks that measure time in a continuous manner, are regarded as an essential component of sensing technology. Precision and recurrence time are two basic features of continuous clocks. In this paper, in the framework of quantum estimation theory various models for continuous quantum clocks are proposed, and all tools of quantum estimation theory are employed to seek the characteristics of clocks with high precision and long recurrence time. Then, in a resource-based approach, the performances of the proposed models are compared. It is shown that quantum clocks based on an n two-qubit system not only can have better precision than quantum clocks based on a 2n one-qubit system but also support long recurrence time. Finally, it is shown that while employing n entangled qubits improves the precision of clocks by a factor of 1/n, it inevitably worsens the recurrence time of the clock. © 2022 American Physical Society
  6. Keywords:
  7. Clocks ; Qubits ; Entangled qubits ; High-precision ; Performance ; Quantum estimation theory ; Qubit system ; Recurrence time ; Resources based ; Sensing technology ; Two-qubit system ; Quantum entanglement
  8. Source: Physical Review A ; Volume 106, Issue 2 , 2022 ; 24699926 (ISSN)
  9. URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.106.022427