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Slowing Quantum Decoherence by Squeezing in Phase Space.

H Le Jeannic1, A Cavaillès1, K Huang1,2

  • 1Laboratoire Kastler Brossel, Sorbonne Université, CNRS, PSL Research University, Collège de France, 4 Place Jussieu, 75005 Paris, France.

Physical Review Letters
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Summary
This summary is machine-generated.

Squeezing quantum superposition states significantly slows down decoherence, preserving nonclassical features. This method offers a novel approach to protect quantum states in phase space.

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Area of Science:

  • Quantum optics
  • Quantum information science

Background:

  • Non-Gaussian states, like cat states, are highly susceptible to losses.
  • Decoherence rapidly diminishes nonclassical features and Wigner function negativity.

Purpose of the Study:

  • To experimentally demonstrate reduced decoherence in squeezed superposition states.
  • To introduce a metric for quantifying state robustness against losses.

Main Methods:

  • Generating squeezed optical coherent-state superpositions.
  • Propagating states through a lossy channel.
  • Analyzing Wigner function negativity decay.

Main Results:

  • Observed significantly reduced decoherence in squeezed superposition states.
  • Introduced a novel quantification method for state robustness.
  • Demonstrated the protective role of squeezing against channel losses.

Conclusions:

  • Squeezing acts as a Gaussian resource to enhance the resilience of quantum superpositions.
  • This technique offers new avenues for protecting and manipulating quantum states.
  • Reduced decoherence opens possibilities for advanced quantum technologies.