Quantum behavior of a superconducting Duffing oscillator at the dissipative phase transition

• URL: http://arxiv.org/abs/2206.06338v1
• Date: Mon, 13 Jun 2022 17:35:27 GMT
• Title: Quantum behavior of a superconducting Duffing oscillator at the dissipative phase transition
• Authors: Qi-Ming Chen, Michael Fischer, Yuki Nojiri, Michael Renger, Edwar Xie, Matti Partanen, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
• Abstract summary: We reconcile the classical and quantum descriptions in a unified picture of quantum metastability. By engineering the lifetime of the metastable states sufficiently large, we observe a first-order dissipative phase transition. Results reveal a smooth quantum evolution behind a sudden dissipative transition.
• Score: 0.817918559522319
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Understanding the non-deterministic behavior of deterministic nonlinear systems has been an implicit dream since Lorenz named it the "butterfly effect". A prominent example is the hysteresis and bistability of the Duffing oscillator, which in the classical description is attributed to the coexistence of two steady states in a double-well potential. However, this interpretation fails in the quantum-mechanical perspective, where a single unique steady state is allowed in the whole parameter space. Here, we measure the non-equilibrium dynamics of a superconducting Duffing oscillator and reconcile the classical and quantum descriptions in a unified picture of quantum metastability. We demonstrate that the two classically regarded steady states are in fact metastable states. They have a remarkably long lifetime in the classical hysteresis regime but must eventually relax into a single unique steady state allowed by quantum mechanics. By engineering the lifetime of the metastable states sufficiently large, we observe a first-order dissipative phase transition, which mimics a sudden change of the mean field in a 11-site Bose-Hubbard lattice. We also reveal the two distinct phases of the transition by quantum state tomography, namely a coherent-state phase and a squeezed-state phase separated by a critical point. Our results reveal a smooth quantum state evolution behind a sudden dissipative phase transition, and they form an essential step towards understanding hysteresis and instability in non-equilibrium systems.

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