Pulsed Generation of Quantum Coherences and Non-classicality in Light-Matter Systems

Abstract

We show that a pulsed stimulus can be used to generate many-body quantum coherences in light-matter systems of general size. Specifically, we calculate the exact real-time evolution of a driven, generic out-of-equilibrium system comprising an arbitrary number N qubits coupled to a global boson field. A novel form of dynamically-driven quantum coherence emerges for general N and without having to access the empirically challenging strong-coupling regime. Its properties depend on the speed of the changes in the stimulus. Non-classicalities arise within each subsystem that have eluded previous analyses. Our findings show robustness to losses and noise, and have potential functional implications at the systems level for a variety of nanosystems, including collections of N atoms, molecules, spins, or superconducting qubits in cavities -- and possibly even vibration-enhanced light harvesting processes in macromolecules.

9 pages, 4 figures

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• Chapter: Vulnerability of Quantum Information Systems to Collective Manipulation
• Optimal basis for the generalized Dicke model
• Energy transfer in $N$-component nanosystems enhanced by pulse-driven vibronic many-body entanglement
• Quantum information scrambling in adiabatically-driven critical systems
• Ladder of Loschmidt anomalies in the deep strong-coupling regime of a qubit-oscillator system