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Entanglement test on a microscopic-macroscopic system.

Francesco De Martini1, Fabio Sciarrino, Chiara Vitelli

  • 1Dipartimento di Fisica dell'Universitá La Sapienza and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Roma, 00185 Italy.

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Summary
This summary is machine-generated.

Researchers created a large quantum superposition of photons entangled with a single photon. This demonstrates nonseparability in multipartite quantum systems using advanced optical techniques.

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Area of Science:

  • Quantum Optics
  • Quantum Information Science

Background:

  • Entangled photon pairs are fundamental to quantum information processing.
  • Controlling multipartite quantum states is crucial for advancing quantum technologies.

Purpose of the Study:

  • To generate a macrostate of entangled photons.
  • To investigate the nonseparability of a complex quantum system.

Main Methods:

  • Nonlinear optical processes to create entangled photon pairs.
  • Injection into a phase-covariant cloning machine (optical parametric amplifier).
  • Local filtering and positive operator valued measurement for nonseparability demonstration.

Main Results:

  • Successfully generated a macrostate of approximately 3.5x10^4 photons in superposition.
  • Established a connection between single photons and multiparticle fields.
  • Demonstrated the nonseparability of the generated bipartite system.

Conclusions:

  • The study showcases a novel method for creating and verifying complex entangled quantum states.
  • Highlights the potential for multipartite entanglement in future quantum applications.