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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
|March 16, 2018
Summary
Squeezing quantum superposition states significantly slows down decoherence, preserving nonclassical features. This method offers a novel approach to protect quantum states in phase space.
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.
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