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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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An elementary quantum network of entangled optical atomic clocks.

B C Nichol1, R Srinivas2, D P Nadlinger3

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Researchers created an elementary quantum network of entangled optical clocks using a photonic link to connect two strontium ion clocks separated by 2 meters. This entanglement significantly reduced measurement uncertainty, approaching the Heisenberg limit for enhanced time and frequency comparisons.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Metrology

Background:

  • Optical atomic clocks are the most precise time and frequency measurement tools.
  • Comparing remote optical clocks enables fundamental physics tests, geodesy, and clock error evaluation.
  • Entanglement can surpass the standard quantum limit, reaching the Heisenberg limit for enhanced precision.

Purpose of the Study:

  • To demonstrate an elementary quantum network of entangled optical clocks using remote ions.
  • To investigate the use of a photonic link for high-fidelity entanglement between distant atomic systems.
  • To quantify the precision enhancement achieved through entanglement in frequency comparisons.

Main Methods:

  • Utilized a photonic link to entangle two 88Sr+ ions separated by approximately 2 meters.
  • Performed precision frequency comparisons between the entangled ions.
  • Measured the reduction in uncertainty compared to conventional spectroscopy techniques.

Main Results:

  • Demonstrated entanglement between remote 88Sr+ ions, forming an elementary quantum network of optical clocks.
  • Achieved a reduction in measurement uncertainty approaching the Heisenberg limit for frequency comparisons.
  • Observed a factor of 2 reduction in measurement uncertainty compared to conventional methods in the presence of laser dephasing.

Conclusions:

  • Entanglement via a photonic link enables enhanced precision for remote optical clock comparisons.
  • This two-node network represents a foundational step towards larger quantum networks for advanced metrology and physics.
  • The demonstrated technique offers a pathway to overcome limitations of current optical clock comparisons.