Steady-state spectral kissing and dissipative phase transitions

• URL: http://arxiv.org/abs/2606.18348v1
• Date: Tue, 16 Jun 2026 18:00:04 GMT
• Title: Steady-state spectral kissing and dissipative phase transitions
• Abstract summary: We show that a dissipative KPO has a counterpart encoded in the spectrum of the steady-state density matrix.<n>We derive analytical expressions for the critical lines governing both the onset of steady-state spectral kissing and its disappearance at a dissipative phase transition.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Spectral kissing, recently realized in a Kerr parametric oscillator (KPO), refers to the merging of pairs of energy levels and arises as a manifestation of an excited-state quantum phase transition (ESQPT). Here, we show that this phenomenon has a dissipative counterpart encoded in the spectrum of the steady-state density matrix. Using a dissipative KPO as a representative example, we demonstrate that, in the weak-dissipation regime, the eigenvalues of the steady-state density matrix organize into quasi-degenerate pairs that mirror the spectral kissing of the corresponding closed system. As the dissipation strength increases, this pairing gradually disappears. By analyzing the classical limit of the system, we derive analytical expressions for the critical lines governing both the onset of steady-state spectral kissing and its disappearance at a dissipative phase transition.

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