187,517 research outputs found
Quasiprobabilities of work and heat in an open quantum system
No full textWe discuss an approach to determine averages of the work, dissipated heat, and variation of internal energy of an open quantum system driven by an external classical field. These quantities are measured by coupling the quantum system to a quantum detector at different times. This approach allows us to preserve the full quantum features of the evolution. From the measured phase, we are able to obtain a quasicharacteristic function and a quasiprobability density function for the corresponding observables. Despite the fact that these quasiprobability density functions are not the results of direct measurements, they reproduce the expected value of the physical quantities. Analogously to the Wigner function, the negative regions of these quasiprobability density functions are directly related to pure quantum processes which are not interpretable in classical terms. We use this feature to show that in the limit of fast dissipation, the quantum features vanish and interpret this as the emergence of the classical limit of the energy exchange process. Our analysis explains and confirms the behavior observed in recent experiments performed on IBMQ devices [P. Solinas et al., Phys. Rev. A 103, L060202 (2021)]. The possibility to discriminate between classical and quantum features makes the proposed approach an excellent tool to determine if, and in which conditions, quantum effects can be exploited to increase the efficiency in an energy exchange process at the quantum level
“L’istoria è la Samaritana col Messia”, Artemisia Gentileschi e Cassiano dal Pozzo
No full textF. Solinas, “L’istoria è la Samaritana col Messia”, Artemisia Gentileschi e Cassiano dal Pozzo, dans Cristo e la Samaritana al pozzo di Artemisia Gentileschi, sous la direction de F. Solinas, p. 11 – 23, Rome - Pise 2022.International audienc
Les dames du baroque histoires de femmes peintres dans l’Italie de la Contre-Réforme
No full textF. Solinas, Les Dames du Baroque. Histoires de femmes peintres dans l’Italie de la Contre-Réforme, dans, Les Dames du Baroque, p. 8 – 21.International audienc
Full distribution of work done on a quantum system for arbitrary initial states
No full textWe propose an approach to define and measure the statistics of work, internal energy and dissipated heat in a driven quantum system. In our framework the presence of a physical detector arises naturally and work and its statistics can be investigated in the most general case. In particular, we show that the quantum coherence of the initial state can lead to measurable effects on the moments of the work done on the system. At the same time, we recover the known results if the initial state is a statistical mixture of energy eigenstates. Our method can also be applied to measure the dissipated heat in an open quantum system. By sequentially coupling the system to a detector, we can track the energy dissipated in the environment while accessing only the system degrees of freedom
Competitivitè et flexibilitè su système de production des districts. Le cas du secteur italien de la chaussure
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Sulla terminologia della parentela nell’indeuropeo. Le radici ottocentesche della questione. Parte I
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Una Madonna del Latte di Artemisia Lomi Gentileschi, lasciata a Firenze e ritrovata in Normandia
No full textF. Solinas, Una Madonna del Latte di Artemisia Lomi Gentileschi, lasciata a Firenze e ritrovata in Normandia, dans Amica Veritas. Studi in onore di Claudio Strinati, sous la dir. de A. Vannugli, Rome 2020, p. 485 – 494.International audienc
Sulla celticità linguistica nell'Italia antica: il leponzio. Da Biondelli e Mommsen ai nostri giorni, Parte II
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