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Entangling power of passive optical elements.

Michael M Wolf1, Jens Eisert, Martin B Plenio

  • 1Institute for Mathematical Physics, TU Braunschweig, 38106 Braunschweig, Germany.

Physical Review Letters
|February 7, 2003
PubMed
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Researchers explored how passive optical elements can create quantum entanglement. They found a key condition linking squeezing to entanglement generation in Gaussian states using these elements.

Area of Science:

  • Quantum optics
  • Quantum information science

Background:

  • Passive optical elements are crucial for manipulating quantum states.
  • Understanding entanglement generation is key for quantum technologies.

Purpose of the Study:

  • To investigate the entanglement capabilities of passive optical elements.
  • To establish a quantitative link between squeezing and attainable entanglement.
  • To identify conditions for creating distillable entanglement in Gaussian states.

Main Methods:

  • Developed a general necessary and sufficient condition for entanglement creation.
  • Analyzed arbitrary multimode Gaussian states.
  • Focused on two-mode Gaussian states for optimal procedures.

Main Results:

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  • Established a connection between squeezing and entanglement via passive optics.
  • Provided an explicit formula for the degree of entanglement in two-mode states.
  • Identified optimal entangling procedures for specific Gaussian states.

Conclusions:

  • Passive optical elements can be used to generate distillable entanglement.
  • Squeezing plays a critical role in entanglement achievable with passive operations.
  • The findings offer practical insights for quantum state manipulation.