Thermodynamics of the Ramsey Zone

Autor(es)

de Assis, Rogerio Jorge ; Diniz, Ciro Micheletti ; de Almeida, Norton Gomes ; Villas-Boas, Celso Jorge

• Tipo de documento: Artigo Científico
• Fonte: Entropy; v. 25, n. 10, p. 10-pg., 2023-10-01.

Resumo

We studied the thermodynamic properties such as the entropy, heat (JQ), and work (JW) rates involved when an atom passes through a Ramsey zone, which consists of a mode field inside a low-quality factor cavity that behaves classically, promoting rotations on the atomic state. Focusing on the atom, we show that JW predominates when the atomic rotations are successful, maintaining its maximum purity as computed by the von Neumann entropy. Conversely, JQ stands out when the atomic state ceases to be pure due to its entanglement with the cavity mode. With this, we interpret the quantum-to-classical transition in light of the heat and work rates. Besides, we show that, for the cavity mode to work as a Ramsey zone (classical field), several photons (of the order of 106) need to cross the cavity, which explains its classical behavior, even when the inside average number of photons is of the order of unity. (AU)

• Processo FAPESP: 21/04672-0 - Motores térmicos quânticos e estados estacionários fora do equilíbrio
• Beneficiário: Rogério Jorge de Assis
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/11999-5 - Efeitos coletivos em sistemas atômicos, spins nucleares e eletrodinâmica quântica de cavidades
• Beneficiário: Celso Jorge Villas-Bôas
• Modalidade de apoio: Auxílio à Pesquisa - Regular