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Heisenberg-limited atom clocks based on entangled qubits.

E M Kessler1, P Kómár2, M Bishof3

  • 1Physics Department, Harvard University, Cambridge, Massachusetts 02138, USA and ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA.

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We developed a quantum atomic clock protocol using Greenberger-Horne-Zeilinger (GHZ) states for enhanced stability. This method overcomes laser noise limitations, offering significant gains in clock precision, especially for short averaging times.

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Area of Science:

  • Quantum physics
  • Atomic clocks
  • Metrology

Background:

  • Atomic clocks are crucial for timekeeping and scientific measurement.
  • Laser phase drift is a primary source of decoherence in atomic clocks.
  • Existing protocols face limitations in achieving optimal clock stability.

Purpose of the Study:

  • To introduce a novel quantum-enhanced atomic clock protocol.
  • To improve clock stability beyond current theoretical limits.
  • To address realistic decoherence sources like laser phase noise.

Main Methods:

  • Utilizing sequentially larger Greenberger-Horne-Zeilinger (GHZ) states.
  • Implementing an incoherent phase estimation algorithm.
  • Simultaneously interrogating atomic phases with entangled states.

Main Results:

  • Achieved the best clock stability allowed by quantum theory (with logarithmic correction).
  • Extended coherent interrogation time beyond the laser noise limit.
  • Demonstrated significant stability gains for short averaging times.

Conclusions:

  • The new protocol offers superior performance under realistic conditions.
  • Entanglement provides a distinct advantage for atomic clock stabilization.
  • This advancement pushes the boundaries of precision metrology.