Dispersion forces inside metallic waveguides

Shahmoon, Ephraim; Kurizki, Gershon

doi:10.1103/physreva.87.062105

Cited by 54 publications

(90 citation statements)

References 21 publications

(31 reference statements)

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“…For the same geometry, an exponential decay was also found at any finite temperature [23]. An exponential reduction of the interaction between the atoms has been also observed when they are confined in a rectangular waveguide and their distance is large compared to the diameter of the waveguide [26]. Contrary to that, a recent study of two atoms placed inside a transmission line consisting of two concentric metallic cylinders demonstrated a huge amplification of the interaction between the atoms due to the one-dimensional character of propagating fluctuations in this geometry [27].…”

Section: Discussionmentioning

confidence: 57%

“…Clearly, all modes in our cylindrical shell, and also in the rectangular waveguide of Ref. [26] are massive, explaining an exponential reduction of the interaction. However, for two parallel conducting plates, there exists a massless mode only for TM polarization [32].…”

Section: Discussionmentioning

confidence: 99%

“…More recently, there have been studies of the Casimir-Polder interaction for an atom inside a cylindrical cavity [24,25], and a compact object inside a spherical cavity [9]. Recent studies of the modification of the force between two atoms inside quasi one-dimensional structures have displayed an exponential reduction of the interaction for a rectangular waveguide [26] and a huge amplification of the interaction for two concentric metallic cylinders [27].…”

Section: Introductionmentioning

confidence: 99%

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Effect of curvature and confinement on the Casimir-Polder interaction

Rodriguez-López¹,

Emig²,

Noruzifar³

et al. 2015

Phys. Rev. A

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Modifications of Casimir-Polder interactions due to confinement inside a cylindrical cavity and due to curvature in-and outside the cavity are studied. We consider a perfectly conducting cylindrical shell with a single particle (atom or macroscopic sphere) located next to its interior or exterior surface, or two atoms placed inside the shell. By employing the scattering approach, we obtain the particle-cavity interaction and the modification of the two-particle interaction due to the cavity. We consider both retardation and thermal effects. While for the atoms a dipole description is sufficient, for the macroscopic sphere we sum (numerically) over many multipole fluctuations to compute the interaction at short separations. In the latter limit we compare to the proximity approximation and a gradient expansion and find agreement. Our results indicate an confinement induced suppression of the force between atoms. General criteria for suppression and enhancement of Casimir interactions due to confinement are discussed.

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Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of curvature and confinement on the Casimir-Polder interaction

Rodriguez-López¹,

Emig²,

Noruzifar³

et al. 2015

Phys. Rev. A

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“…To this end we shall use the results of the weak-coupling, non-Markovian master equation [18,27,28], whereby…”

Section: System-bath Decorrelation Via Qnd Measurementsmentioning

confidence: 99%

Work extraction via quantum nondemolition measurements of qubits in cavities: Non-Markovian effects

et al. 2013

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We show that frequent nondemolition measurements of a quantum system immersed in a thermal bath allow the extraction of work in a closed cycle from the system-bath interaction (correlation) energy, a hitherto unexploited work resource. It allows for work even if no information is gathered or the bath is at zero temperature, provided the cycle is within the bath memory time. The predicted work resource may be the basis of quantum engines embedded in a bath with long memory time, such as the electromagnetic bath of a high-Q cavity coupled to two-level systems. I. IntroductionInformation acquired by an observer on the system can be commuted into work in a single-bath engine [1][2][3][4][5][6][7][8][9]. To this end, the observer ("Maxwell's demon") must manipulate the system according to the results of measurements performed on it. The measurements have therefore to be selective, i.e., their outcomes must be read and discriminated to determine the observer's course of action [7,10]. The balance of work and information is embodied by the Szilard-Landauer (SL) principle [1, 2] whereby work obtainable from a measurement must not exceed the energy cost of erasing its record from the observer's memory. Notwithstanding ongoing efforts to expand information-based thermodynamics (IT) so as to include measurement-cost effects [10][11][12] beyond the original SL balance (see Appendix), an important aspect has been little addressed thus far [13]: How essential is the thermodynamic paradigm of system-bath separability [14,15] to the analysis of work extraction by measurements?This question is here investigated in the context of non-Markovian quantum thermodynamics "under observation" [16][17][18][19][20][21]. Namely, we show that frequent measurements can induce changes in system-bath correlations, unaccounted for by the separability paradigm, and thereby change the tradeoff of information and work. Consequently, selective (read) measurements can extract more work in a closed cycle than what the SL principle allows. This effect requires the cycle to be completed within a non-Markovian (bath-memory) time-scale.We further show that non-selective quantum nondemolition (QND) measurements of the system energy (which we shall also denote as unread measurements, i.e., measurements whose outcomes do not matter) enable the system to do work in a cycle, although they provide no information on the system, nor do they change its state (by their definition as QND measurements) and thus do not act as a "demon." Work is shown to be obtainable within the bath memory time even at zero temperature (T = 0),

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“…Refs. [44][45][46][47][48]). (2) What is the optimal scheduling (cycle form) for attaining the best performance: reciprocating, continuous or possibly some intermediate (hybrid) cycles?…”

Section: Introductionmentioning

confidence: 99%

Speed and efficiency limits of multilevel incoherent heat engines

Mukherjee¹,

Niedenzu²,

Kofman³

et al. 2016

Phys. Rev. E

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We present a comprehensive theory of heat engines (HE) based on a quantum-mechanical "working fluid" (WF) with periodically-modulated energy levels. The theory is valid for any periodicity of driving Hamiltonians that commute with themselves at all times and do not induce coherence in the WF. Continuous and stroke cycles arise in opposite limits of this theory, which encompasses hitherto unfamiliar cycle forms, dubbed here hybrid cycles. The theory allows us to discover the speed, power and efficiency limits attainable by incoherently-operating multilevel HE depending on the cycle form and the dynamical regimes.

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Dispersion forces inside metallic waveguides

Cited by 54 publications

References 21 publications

Effect of curvature and confinement on the Casimir-Polder interaction

Effect of curvature and confinement on the Casimir-Polder interaction

Work extraction via quantum nondemolition measurements of qubits in cavities: Non-Markovian effects

Speed and efficiency limits of multilevel incoherent heat engines

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