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Area of Science:

  • Quantum metrology
  • Atomic clocks
  • Precision measurement

Background:

  • Optical lattice clocks are state-of-the-art in precision metrology.
  • They operate near the standard quantum limit imposed by quantum noise.
  • Quantum entanglement offers a path beyond this limit but faces scalability and resolution challenges.

Purpose of the Study:

  • To develop a novel spectroscopy technique for optical clocks.
  • To surpass the standard quantum limit in metrology and improve laser noise sensitivity.
  • To address scalability and resolution limitations in quantum-enhanced metrology.

Main Methods:

  • Adaptation of the holonomic quantum gate concept.
  • Development of a Rabi-type 'global-phase spectroscopy' utilizing the Aharonov-Anandan phase.
  • Implementation of rotary echo for protection against coupling inhomogeneities and differential measurement for laser noise cancellation.

Main Results:

  • Demonstration of quantum-amplified time-reversal spectroscopy on an optical clock transition.
  • Achieved 2.4(7) dB metrological gain beyond the standard quantum limit.
  • Achieved 4.0(8) dB improvement in laser noise sensitivity.

Conclusions:

  • The developed technique overcomes limitations of measurement resolution and scales easily.
  • It shows high resilience to experimental imperfections.
  • The method is broadly applicable to next-generation atomic clocks and quantum sensors.