Dynamical Casimir effect in quantum-information processing

Benenti, Giuliano; D’Arrigo, A.; Siccardi, Stefano; Strini, G.

doi:10.1103/physreva.90.052313

Cited by 44 publications

(41 citation statements)

References 48 publications

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“…Such quantum vacuum amplification effect, known as the Dynamical Casimir Effect (DCE) [14][15][16], has been observed in recent experiments with superconducting circuits [17,18], and also investigated in the context of Bose-Einstein condensates [19], in excition-polariton condensates [20], for multipartite entanglement generation in cavity networks [21] and for quantum communication protocols [22]. Here, we show that the DCE is a fundamental, purely quantum, limitation to cooling.…”

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confidence: 56%

Dynamical Casimir effect and minimal temperature in quantum thermodynamics

Benenti

Strini

2015

Phys. Rev. A

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We study the fundamental limitations of cooling to absolute zero for a qubit, interacting with a single mode of the electromagnetic field. Our results show that the dynamical Casimir effect, which is unavoidable in any finite-time thermodynamic cycle, forbids the attainability of the absolute zero of temperature, even in the limit of an infinite number of cycles.PACS numbers: 05.70. Ln, 07.20.Pe, Introduction. Due to recent progress of nanofabrication technology, quantum effects in small heat engines have become an increasingly important subject. Concepts from quantum thermodynamics [1] have been applied to investigate questions such as the optimization of quantum thermal machines [2], the fundamental dimensional limits to thermodynamic machines [3], and the minimum temperature achievable in nanoscopic chillers [4][5][6][7][8][9][10][11]. Cooling a system to the absolute zero of temperature (T = 0) is prohibited by Nernst's unattainability principle [12], also known as the dynamical formulation of the third law of thermodynamics. Such principle states that it is impossible by any procedure to reduce any system to T = 0 in finite time. Nernst's principle has been recently challenged [8].It this Letter, we investigate the unattainability principle in a minimal model: a qubit coupled to a single mode of the electromagnetic field, i.e. a harmonic oscillator. The oscillator is the working medium, shuttling heat from the qubit to a hot reservoir by means of a (quantum) Otto cycle. Although oversimplified, our model has several relevant features:

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confidence: 56%

Dynamical Casimir effect and minimal temperature in quantum thermodynamics

Benenti

Strini

2015

Phys. Rev. A

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“…Indeed, a rapid variation of the matter-field coupling is needed to implement ultrafast quantum gates, and therefore the DCE appears as a fundamental limit to the implementation of high-speed quantum gates [18] and more generally to the development of ultrafast quantum technologies. First experimental demonstrations of the DCE have been reported in superconducting circuit quantum electrodynamics [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…First experimental demonstrations of the DCE have been reported in superconducting circuit quantum electrodynamics [19,20]. However, it is of great interest to have the ability to either enhance or counteract [18] this effect: On the one hand, it improves our capability of investigating fundamental effects in nature, and, on the other hand, it enables us to push the limits of quantum information processing.…”

Section: Introductionmentioning

confidence: 99%

Amplification of the parametric dynamical Casimir effect via optimal control

et al. 2017

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We introduce different strategies to enhance photon generation in a cavity within the Rabi model in the ultrastrong coupling regime. We show that a bang-bang strategy allows to enhance the effect of up to one order of magnitude with respect to simply driving the system in resonance for a fixed time. Moreover, up to about another order of magnitude can be gained exploiting quantum optimal control strategies. Finally, we show that such optimized protocols are robust with respect to systematic errors and noise, paving the way to future experimental implementations of such strategies.

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“…[14]. These experiments stimulated new theoretical research on role of dynamical Casimir physics in quantum information processing, quantum simulations and engineering of nonclassical states of light and matter [15][16][17][18][19]. There are also ongoing experiments aimed at measuring the photon creation induced by the time-dependent conductivity of a semiconductor slab enclosed by an electromagnetic cavity [20], as well as proposals based on the use of high frequency resonators to produce the photons, and ultracold atoms to detect the created photons via superradiance [21].…”

Section: Introductionmentioning

confidence: 99%

Numerical approach to simulating interference phenomena in a cavity with two oscillating mirrors

2017

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We study photon creation in a cavity with two perfectly conducting moving mirrors. We derive the dynamic equations of the modes and study different situations concerning various movements of the walls, such as translational or breathing modes. We can even apply our approach to one or three dimensional cavities and reobtain well known results of cavities with one moving mirror. We compare the numerical results with analytical predictions and discuss the effects of the intermode coupling in detail as well as the non perturbative regime. We also study the time evolution of the energy density as well and provide analytic justifications for the different results found numerically.

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Dynamical Casimir effect in quantum-information processing

Cited by 44 publications

References 48 publications

Dynamical Casimir effect and minimal temperature in quantum thermodynamics

Dynamical Casimir effect and minimal temperature in quantum thermodynamics

Amplification of the parametric dynamical Casimir effect via optimal control

Numerical approach to simulating interference phenomena in a cavity with two oscillating mirrors

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