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Aug 2026
Engineering quantum Fisher information and non-Markovian dynamics via classical driving in cavity QED
We investigate the simultaneous control of quantum parameter-estimation precision and non-Markovian memory effects in a driven two-qubit system that is collectively coupled to a leaky cavity. Using a dressed-state formalism, we derive analytical solutions for identical and non-identical qubits and analyze how classical...
Ghasem Zare Firozi, A. Mortezapour, Borhan Arghavani Nia et al.
· AVS Quantum Science · 0 citations
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Sep 2026
Unraveling-Dependent Metastability in Monitored Quantum Systems and Associative Memories
Metastability in open quantum systems is usually inferred from spectral separation in the Liouvillian, which governs unconditional, ensemble-averaged dynamics. We show that this diagnosis is incomplete at the level of individual quantum trajectories: conditioned realizations of the same unconditional dynamics can bypas...
Manali Malakar, Roberta Zambrini, G. Giorgi
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Preprint
Sep 2026
Exact Operator Complexity Measures from Random Matchgate Unitaries
Matchgate circuits describe classically tractable dynamics in a physically relevant setting while nonetheless exhibiting features characteristic of complex quantum systems, such as high amounts of magic. This invites the broader question: to what extent are typical complexity measures saturated under trivial dynamics?...
Gregory A. L. White, Jens Eisert, Neil Dowling
· 1 citation
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Sep 2026
Moment-Selective Quantum Designs in Aperiodic Temporal Ensembles
We introduce a general mechanism for engineering moment-selective temporal designs with hierarchically structured aperiodic drives. At special control settings where the driven dynamics is constrained by a finite symmetry group, lower-order moments can already reproduce Haar statistics while a selected higher-order dev...
Peng Yang
· 0 citations
Preprint
Sep 2026
Exact Gaussian Entanglement Dynamics and Initial-State Control in Coupled Parametric Oscillators
We study two bilinearly coupled harmonic oscillators driven by a common time-dependent spring. A fixed normal-mode transformation reduces the pair to two parametric oscillators, each solved exactly by its Lewis-Riesenfeld invariant and Ermakov-Pinney amplitude, including the ladder-operator construction and the Lewis-R...
R. Bernal-Jaquez, H. Hernández-Hernández, A. Schaum et al.
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Preprint
Sep 2026
Finite Realizations and Effective Memory in Monitored Nonlinear Quantum Dynamics
Nonlinear dynamics generate non-Gaussian states and operations, but they also make continuously monitored quantum systems difficult to track. A quantum filter performs this task by compressing a noisy measurement record into a set of evolving variables that predict future observables. For Gaussian dynamics, this compre...
Jacob Emerson
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