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Area of Science:

  • Quantum optics
  • Atomic physics
  • Quantum information science

Background:

  • All-optical transistors offer potential for high-speed optical switching.
  • Achieving high gain with minimal photon loss is crucial for practical applications.
  • Rydberg excitations in ultracold gases provide a promising platform for quantum control.

Purpose of the Study:

  • To investigate the quantum limit of an all-optical transistor.
  • To demonstrate high gain and high fidelity switching using Rydberg excitations.
  • To explore the potential for complex optical computations.

Main Methods:

  • Utilizing ultracold atomic gases to store gate light pulses as Rydberg excitations.
  • Employing Rydberg blockade enhanced by Förster resonance to control target light pulse transmission.
  • Single-shot detection of transmitted photons to determine gate state.

Main Results:

  • Observed a gain of 20 at the quantum limit of one incoming gate photon.
  • Achieved single-shot detection fidelity above 0.86 for Rydberg excitation.
  • Demonstrated suppression of target photon transmission via Rydberg blockade.

Conclusions:

  • The demonstrated all-optical transistor operates at the quantum limit with significant gain.
  • High fidelity single-shot readout is achievable, paving the way for quantum information processing.
  • The high gain facilitates fan-out, enabling complex optical computational architectures.