Observation of quasiparticle pair-production and quantum entanglement in atomic quantum gases quenched to an attractive interaction

• URL: http://arxiv.org/abs/2102.11215v1
• Date: Mon, 22 Feb 2021 17:45:04 GMT
• Title: Observation of quasiparticle pair-production and quantum entanglement in atomic quantum gases quenched to an attractive interaction
• Authors: Cheng-An Chen, Sergei Khlebnikov and Chen-Lung Hung
• Abstract summary: We report observation of quasiparticle pair-production and characterize quantum entanglement created by a modulational instability in an atomic superfluid. By quenching the atomic interaction to attractive and then back to weakly repulsive, we produce correlated quasiparticles. We observe large amplitude growth in the power spectrum and subsequent coherent oscillations in a wide spatial frequency band within our resolution limit.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report observation of quasiparticle pair-production and characterize quantum entanglement created by a modulational instability in an atomic superfluid. By quenching the atomic interaction to attractive and then back to weakly repulsive, we produce correlated quasiparticles and monitor their evolution in a superfluid through evaluating the in situ density noise power spectrum, which essentially measures a 'homodyne' interference between ground state atoms and quasiparticles of opposite momenta. We observe large amplitude growth in the power spectrum and subsequent coherent oscillations in a wide spatial frequency band within our resolution limit, demonstrating coherent quasiparticle generation and evolution. The spectrum is observed to oscillate below a quantum limit set by the Peres-Horodecki separability criterion of continuous-variable states, thereby confirming quantum entanglement between interaction quench-induced quasiparticles.

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