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"Photonic" Cat States from Strongly Interacting Matter Waves
Uwe R Fischer1, Myung-Kyun Kang1
1Department of Physics and Astronomy, Center for Theoretical Physics, Seoul National University, 151-747 Seoul, Korea.
Physical Review Letters
|January 15, 2016
Summary
Ultracold quantum gases can form matter-wave cat states, analogous to photon cat states. These states depend on many-body correlations and can be measured via density-density correlations.
Area of Science:
- Quantum physics
- Atomic physics
- Quantum optics
Background:
- Ultracold quantum gases offer a platform for studying quantum phenomena.
- Photon cat states are well-established nonclassical states in quantum optics.
- Understanding many-body correlations is key to novel quantum states.
Purpose of the Study:
- To investigate the formation of matter-wave cat states in ultracold quantum gases.
- To establish a connection between matter-wave cat states and photon cat states.
- To identify experimental methods for accessing the properties of these matter-wave states.
Main Methods:
- Theoretical analysis of ultracold scalar bosons in a single well.
- Utilizing Fock space basis for quantum state representation.
- Investigating many-body correlations within the condensate.
Main Results:
- Identified conditions for ultracold gases to form twofold fragmented condensates.
- Demonstrated the equivalence of these matter-wave states to photon cat states in a specific basis.
- Established that matter-wave cat states critically depend on many-body correlations.
Conclusions:
- Matter-wave cat states are a novel manifestation of quantum superposition in many-body systems.
- The nonclassical nature of these states can be probed through density-density correlations.
- This work bridges quantum optics and ultracold atomic gases, offering new avenues for quantum state engineering and measurement.
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