Degree of Quantumness in Quantum Synchronization
Hodei Eneriz, Daniel Z. Rossatto, Cárdenas López, F. A., Solano Villanueva, Enrique Leónidas, Sanz Ruiz, Mikel · LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) · 2019
We introduce the concept of degree of quantumness in quantum synchronization, a measure of the quantum nature of synchronization in quantum systems. Following techniques from quantum information, we propose the number of non-commuting observables that synchronize as a measure of quantumness. This figure of merit is compatible with already existing synchronization measurements, and it captures different physical properties. We illustrate it in a quantum system consisting of two weakly interacting cavity-qubit systems, which are coupled via the exchange of bosonic excitations between the cavities. Moreover, we study the synchronization of the expectation values of the Pauli operators and we propose a feasible superconducting circuit setup. Finally, we discuss the degree of quantumness in the synchronization between two quantum van der Pol oscillators.