Generalized Entropic Quantum Speed Limits

• URL: http://arxiv.org/abs/2501.11049v2
• Date: Sat, 08 Feb 2025 18:24:05 GMT
• Title: Generalized Entropic Quantum Speed Limits
• Authors: Jucelino Ferreira de Sousa, Diego Paiva Pires,
• Abstract summary: We present a class of generalized entropic quantum speed limits based on $alpha$-$z$-R'enyi relative entropy. Results cover pure or mixed, separable and entangled probe quantum states.
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• Abstract: We present a class of generalized entropic quantum speed limits based on $\alpha$-$z$-R\'{e}nyi relative entropy, a real-valued, contractive, two-parameter family of distinguishability measures. The QSL falls into the class of Mandelstam-Tamm bounds, and applies to finite-dimensional quantum systems that undergo general physical process, i.e., their effective dynamics can be modeled by unitary or nonunitary evolutions. The results cover pure or mixed, separable and entangled probe quantum states. The QSL time depends on the smallest and largest eigenvalues of probe and instantaneous states of the system, and its evaluation requires low computational cost. In addition, it is inversely proportional to the time-average of the Schatten speed of the instantaneous state, which in turn is fully characterized by the considered dynamics. We specialize our results to the case of unitary and nonunitary evolutions. In the former case, the QSL scales with the inverse of the energy fluctuations, while the latter depends on the operator norm of the rate of change of the quantum channel Kraus operators. We illustrate our findings for single-qubit and two-qubit states, unitary and nonunitary evolutions. Our results may find applications in the study of entropic uncertainty relations, quantum metrology, and also entanglement entropies signaled by generalized entropies.

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