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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Published on: May 30, 2014

Are cloned quantum states macroscopic?

F Fröwis1, W Dür

  • 1Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria.

Physical Review Letters
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

Cloned quantum states are not macroscopic superpositions like Schrödinger's cat. However, these cloned states are themselves macroscopic and useful for quantum metrology, showing optimal scaling with system size.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Quantum Metrology

Background:

  • Optimal phase covariant quantum cloners produce multi-particle quantum states.
  • Distinguishing quantum superpositions is key to understanding macroscopic quantum phenomena.

Purpose of the Study:

  • To determine if cloned quantum superpositions exhibit macroscopic properties.
  • To assess the macroscopic nature and metrological applications of cloned quantum states.

Main Methods:

  • Calculation of macroscopic superposition measures.
  • Analysis of the distinguishability of cloned superposed states.
  • Investigation of cloned states' performance in parameter estimation with noise.

Main Results:

  • Cloned quantum superpositions do not qualify as macroscopic superpositions.
  • Distinguishability of cloned states degrades with imperfect detectors or noise.
  • Cloned quantum states exhibit macroscopic properties and optimal scaling for quantum metrology.
  • Cloned states show applicability in noisy parameter estimation.

Conclusions:

  • Quantum cloning does not inherently create macroscopic superpositions.
  • Cloned quantum states are macroscopic and valuable resources for quantum metrology, particularly under noisy conditions.