Negative Wigner function by decaying interaction from equilibrium

• URL: http://arxiv.org/abs/2403.08474v2
• Date: Sun, 19 May 2024 15:03:06 GMT
• Title: Negative Wigner function by decaying interaction from equilibrium
• Authors: Michal Kolář, Radim Filip,
• Abstract summary: We propose a conceptually different and more autonomous way to obtain negative Wigner function superposition states. We demonstrate simultaneously detectable negative Wigner function and quantum coherence and their qualitative enhancement employing more qubits.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Bosonic systems with negative Wigner function superposition states are fundamentally witnessing nonlinear quantum dynamics beyond linearized systems and, recently, have become essential resources of quantum technology with many applications. Typically, they appear due to sophisticated combination of external drives, nonlinear control, measurements or strong nonlinear dissipation of subsystems to an environment. Here, we propose a conceptually different and more autonomous way to obtain such states, avoiding these ingredients, using purely sudden interaction decay in the paradigmatic interacting qubit-oscillator system weakly coupled to bath at thermal equilibrium in a low-temperature limit. We demonstrate simultaneously detectable unconditional negative Wigner function and quantum coherence and their qualitative enhancement employing more qubits.

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