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Atomic Fock state preparation using Rydberg blockade.

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Researchers demonstrated collective Rabi flopping in atom ensembles using Rydberg blockade, confirming enhanced frequencies and creating specific atom number Fock states with high fidelity.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Many-body physics

Background:

  • Rydberg blockade is a key phenomenon in quantum optics for controlling interactions between atoms.
  • Collective phenomena in atomic ensembles are crucial for quantum information processing and metrology.
  • Rabi flopping describes the coherent oscillation of a quantum system between two energy levels.

Purpose of the Study:

  • To demonstrate and quantify collective Rabi flopping mediated by Rydberg blockade in atom ensembles.
  • To investigate the dependence of Rabi frequency on the number of atoms (N).
  • To generate atom number Fock states using collective Rabi pulses and assess their fidelity.

Main Methods:

  • Coherent excitation of 3-16 atom ensembles.
  • Utilizing Rydberg blockade to mediate interactions.
  • Calibrated atom number measurements to verify theoretical predictions.
  • Applying collective Rabi pi pulses for state preparation.

Main Results:

  • Quantitative confirmation of the expected √N Rabi frequency enhancement within 4%.
  • Atom number distributions indicate essentially perfect Rydberg blockade.
  • Successful generation of N=1 and N=2 atom number Fock states with fidelities of 62% and 48%, respectively.
  • Demonstration of collective Rabi frequency enhancement in the N=2 Fock state without atom number fluctuations.

Conclusions:

  • Collective Rabi flopping is effectively mediated by Rydberg blockade in atom ensembles.
  • The observed √N enhancement of Rabi frequency is quantitatively verified.
  • The generation of Fock states using this method shows promise for quantum state engineering.