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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Entanglement and Wigner Function Negativity of Multimode Non-Gaussian States
Mattia Walschaers1, Claude Fabre1, Valentina Parigi1
1Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, ENS-PSL Research University, Collège de France, CNRS; 4 place Jussieu, F-75252 Paris, France.
Physical Review Letters
|December 9, 2017
Summary
Mode-selective photon addition and subtraction are key for creating non-Gaussian states in quantum information. This study provides analytical tools to understand their properties and potential for quantum advantage.
Area of Science:
- Quantum optics
- Quantum information science
- Statistical mechanics
Background:
- Non-Gaussian operations are crucial for unlocking quantum advantages in continuous variable quantum information protocols.
- Photon addition and subtraction are experimentally viable methods for generating non-Gaussian states.
Purpose of the Study:
- To develop an analytical framework for understanding multimode non-Gaussian states generated by photon addition/subtraction.
- To demonstrate entanglement properties and Wigner function negativity in these states.
- To assess the potential of these operations for experimentally generated Gaussian states.
Main Methods:
- Utilizing correlation functions from statistical mechanics and condensed matter physics.
- Applying quantum optics techniques.
- Formulating an analytical expression for the Wigner function after single-photon operations.
Main Results:
- An analytical expression for the Wigner function of multimode non-Gaussian states was derived.
- Entanglement properties unique to non-Gaussian states were demonstrated.
- A practical condition for Wigner function negativity was established.
Conclusions:
- Photon addition and subtraction are effective tools for creating non-Gaussian states with specific quantum properties.
- The developed analytical methods provide insights into entanglement and Wigner negativity.
- These operations show promise for enhancing experimentally generated multimode Gaussian states.
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