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Bulletin of the American Physical Society

Reservoir engineering and many-body decoherence in the quantum Ising model

Lincoln D. Carr, Daniel Jaschke, Inés de Vega

Published Mar 4, 2020• 0 citations
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Abstract Periodically driving a quantum many‐body system can drastically change its properties, leading to exotic non‐equilibrium states of matter without a static analog. In this scenario, parametric resonances and the complexity of an interacting many‐body system are pivotal in establishing non‐equilibrium states. A Floquet‐engineered transverse field Ising model for the controlled propagation in one dimension of spin waves is reported. The underlying mechanisms behind the proposal rely on high‐frequency drivings using characteristic parametric resonances of the spin lattice. Many‐body resonances modulating spin‐spin exchange or individual spin gaps inhibit interactions between spins thus proving a mechanism for controlling spin‐wave propagation and a quantum switch. The schemes may be implemented in circuit QED with direct applications in coupling–decoupling schemes for system‐reservoir interaction and routing in quantum networks.
Engineered dissipative reservoirs have the potential to steer many-body quantum systems toward correlated steady states useful for quantum simulation of high-temperature superconductivity or quantum magnetism. Using up to 49 superconducting qubits, we prepared low-energy states of the transverse-field Ising model through coupling to dissipative auxiliary qubits. In one dimension, we observed long-range quantum correlations and a ground-state fidelity of 0.86 for 18 qubits at the critical point. In two dimensions, we found mutual information that extends beyond nearest neighbors. Lastly, by coupling the system to auxiliaries emulating reservoirs with different chemical potentials, we explored transport in the quantum Heisenberg model. Our results establish engineered dissipation as a scalable alternative to unitary evolution for preparing entangled many-body states on noisy quantum processors.