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REVERSIÓN DE LA FLECHA DEL TIEMPO EN UN SISTEMA DE DOS QUBITS EN PRESENCIA DE RUIDO CUÁNTICO
REVERSAL OF THE ARROW OF TIME IN A TWO-QUBIT SYSTEM IN THE PRESENCE OF QUANTUM NOISE
DOI:
https://doi.org/10.15446/mo.n73.128083Keywords:
Coherencia cu´antica, computaci´on cu´antica, decoherencia cu´antica, entrelazamiento (es)Quantum coherence, quantum computing, quantum decoherence, entanglement (en)
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Generalmente se acepta que, a nivel macroscópico, no es posible revertir la flecha del tiempo, a pesar de que las leyes fundamentales que describen los sistemas físicos son invariantes bajo inversión temporal. No obstante, en el ámbito cuántico surgen propiedades sin análogo clásico, como la superposición y el entrelazamiento, lo que motiva el estudio de posibles simetrías temporales en la evolución de sistemas cuánticos abiertos. Bajo esta perspectiva, se estudia un sistema de dos qubits en presencia de ruido cuántico, utilizando el formalismo de la matriz de densidad y la ecuación maestra de Lehmberg-Agarwal para describir su dinámica abierta. Los resultados obtenidos indican que la simetría temporal en la evolución del sistema depende del grado de entrelazamiento de los estados iniciales.
It is generally accepted that, at the macroscopic level, it is not possible to reverse the arrow of time, even though the fundamental laws describing physical systems are invariant under time reversal. However, in the quantum domain, properties with no classical analog emerge, such as superposition and entanglement, which motivates the study of possible time symmetries in the evolution of open quantum systems. From such a perspective, a two-qubit system is studied in the presence of quantum noise, using the density matrix formalism and the Lehmberg–Agarwal master equation to describe its open dynamics. The results indicate that the time symmetry in the system’s evolution depends on the degree of entanglement of the initial states.
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