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

Quantum process nonclassicality.

Saleh Rahimi-Keshari1, Thomas Kiesel, Werner Vogel

  • 1Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland, Brisbane QLD 4072, Australia. s.rahimik@gmail.com

Physical Review Letters
|May 18, 2013
PubMed
Summary
This summary is machine-generated.

We introduce a new method to identify nonclassical quantum optical processes. This approach uses a quasiprobability distribution to detect nonclassicality and predict output states, demonstrated with single-photon addition.

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Area of Science:

  • Quantum Optics
  • Quantum Information Theory

Background:

  • Defining and identifying nonclassical states and processes is crucial in quantum optics.
  • Existing methods often focus on states rather than the processes that generate them.

Purpose of the Study:

  • To propose a novel definition for nonclassicality in single-mode quantum-optical processes.
  • To develop a method for identifying nonclassical processes and predicting their output states.

Main Methods:

  • Defining process nonclassicality based on the transformation of coherent states.
  • Introducing the process-nonclassicality quasiprobability distribution to detect nonclassicality.
  • Deriving a predictive relation for the nonclassicality of output states.

Main Results:

  • A quantum process is deemed nonclassical if it transforms a coherent state into a nonclassical state.
  • Negativities in the process-nonclassicality quasiprobability distribution signal a process's nonclassical nature.
  • Experimental verification using single-photon addition successfully predicted the nonclassicality of output states from a thermal input state.

Conclusions:

  • The proposed framework offers a robust method for characterizing nonclassical quantum optical processes.
  • The process-nonclassicality quasiprobability distribution provides a valuable tool for quantum state engineering and verification.
  • This work advances the understanding and experimental identification of nonclassical phenomena in quantum optics.