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Engineering Nonequilibrium Steady States through Floquet Liouvillians
Weijian Chen1, Maryam Abbasi1, Serra Erdamar1,2
1Washington University, Department of Physics, St. Louis, Missouri 63130, USA.
Physical Review Letters
|March 25, 2025
Summary
We explored how periodic driving affects superconducting qubits, finding that it can create purer quantum states than constant drives. This offers new ways to control and stabilize quantum systems.
Area of Science:
- Quantum physics
- Superconducting circuits
- Non-equilibrium dynamics
Background:
- Dissipative quantum systems exhibit complex dynamics.
- Superconducting qubits are key components in quantum computing.
- Controlling non-Hermiticity is crucial for quantum state preparation.
Purpose of the Study:
- To experimentally investigate the transient dynamics of dissipative superconducting qubits under periodic driving.
- To understand the role of Floquet Liouvillian in determining non-equilibrium steady states.
- To explore methods for enhancing quantum state purity and stability.
Main Methods:
- Experimental study of a dissipative superconducting qubit.
- Application of periodic driving and stroboscopic evolution analysis.
- Investigation of non-Hermitian degeneracies and exceptional points.
Main Results:
- Periodic drive leads to non-equilibrium steady states determined by a Floquet Liouvillian.
- Drive period controls transients and steady-state properties, including purity.
- Steady states with higher purity achieved compared to constant drive methods.
- Dependence of steady states on parameter variation direction observed.
Conclusions:
- Periodic driving offers a novel approach to control non-Hermiticity in dissipative quantum systems.
- This method presents a new paradigm for quantum state preparation and stabilization.
- Findings are relevant to dynamically encircling exceptional points in quantum systems.
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