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Area of Science:

  • Quantum optics
  • Nonlinear optics
  • Quantum information

Background:

  • Quantum entanglement is crucial for quantum information processing.
  • Nondegenerate optical parametric amplifiers (NOPAs) generate entangled optical modes.
  • Manipulating entanglement properties is key for advancing quantum technologies.

Purpose of the Study:

  • To experimentally demonstrate enhanced and phase-sensitive manipulation of quantum entanglement.
  • To investigate the effect of a second NOPA on entanglement properties.
  • To explore different operational regimes (amplification/deamplification) of NOPAs.

Main Methods:

  • Utilizing two cascaded nondegenerate optical parametric amplifiers (NOPAs).
  • Experimentally controlling the amplification and deamplification states of each NOPA.
  • Measuring entanglement properties via correlation variances.

Main Results:

  • Quantum entanglement between amplitude and phase quadratures was successfully enhanced.
  • Entanglement degree increased when both NOPAs operated in deamplification mode, particularly at resonance.
  • Spectral features of correlation variances were significantly altered when one NOPA was in deamplification and the other in amplification.

Conclusions:

  • The second NOPA effectively enhances and manipulates quantum entanglement.
  • Operational settings of NOPAs allow for controlled modification of entanglement.
  • Experimental findings align with theoretical predictions, validating the proposed method.