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Summary

Researchers created pulsed, two-mode squeezed states with high photon numbers. They measured photon correlations, demonstrating advanced quantum state generation and high-quality measurements in the telecom regime.

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Area of Science:

  • Quantum optics
  • Quantum information science

Background:

  • Two-mode squeezed states are crucial for quantum information processing.
  • Generating and characterizing these states with high photon numbers is challenging.

Purpose of the Study:

  • To generate pulsed, two-mode squeezed states in a single spatiotemporal mode.
  • To directly measure photon-number correlations with high precision.
  • To demonstrate the quality of these states for quantum applications.

Main Methods:

  • Generation of pulsed, two-mode squeezed states.
  • Direct measurement of photon-number correlations using transition edge sensors.
  • Characterization of nonclassical distributions and correlation functions.

Main Results:

  • Pulsed, two-mode squeezed states generated with mean photon numbers up to 20.
  • Photon-number correlations measured up to 80 photons per mode, indicating a state dimensionality of 6400.
  • High detection efficiencies (64%) achieved in the telecom regime.
  • Heralded nonclassical distributions demonstrated up to 50 photons per pulse.
  • Correlation functions calculated up to 40th order.

Conclusions:

  • Successful generation and high-fidelity characterization of pulsed, two-mode squeezed states.
  • Demonstration of a scalable platform for quantum state generation in the telecom band.
  • Potential for advanced quantum technologies leveraging these high-photon-number states.