Signal Velocity, Causality, and Quantum Noise in Superluminal Light Pulse Propagation

Kuzmich, A.; Dogariu, Arthur; Wang, L. J.; Milonni, Peter W.; Chiao, Raymond Y.

doi:10.1103/physrevlett.86.3925

Cited by 190 publications

(121 citation statements)

References 18 publications

(23 reference statements)

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“…Many of these works have discussed the relativistic or "Einstein causality" principle, i.e., the limiting role of the velocity of light in the transmission of signals [13,14,15,16,17,18,19], which must be applicable to relativistic wave equations; the influence of the different wavepacket regions (rear, front) in the transmitted signal, also in the non-relativistic case [20]; the attainability of a sensible signal to noise ratio in superluminal experiments with a small number of photons [21,22,23]; or the role of the frequency band limitation of the signals [24,25,26,27,28]. Much less attention has been paid to the consequences of the more primitive and general causality principle stating that "the effect cannot precede the cause".…”

Section: Introductionmentioning

confidence: 99%

“…[59] For limitations of superluminal propagation due to quantum fluctuations in systems with inverted atomic population see [21,22,23]; the Hartman effect is also affected by dissipation or absorption [53,54] [60] We could try to avoid the interpretational pitfalls of the extrapolated phase time and look instead at the time t out a for a wave packet initially localized near the left edge of the barrier, and with a small spatial width compared to the barrier length d = 2a. In this way one might identify the entrance time and the preparation instant at t = 0 with a tolerable small uncertainty.…”

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confidence: 99%

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Bounds and enhancements for negative scattering time delays

et al. 2002

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The time of passage of the transmitted wave packet in a tunneling collision of a quantum particle with a square potential barrier becomes independent of the barrier width in a range of barrier thickness. This is the Hartman effect, which has been frequently associated with "superluminality". A fundamental limitation on the effect is set by non-relativistic "causality conditions". We demonstrate first that the causality conditions impose more restrictive bounds on the negative time delays (time advancements) when no bound states are present. These restrictive bounds are in agreement with a naive, and generally false, causality argument based on the positivity of the "extrapolated phase time", one of the quantities proposed to characterize the duration of the barrier's traversal. Nevertheless, square wells may in fact lead to much larger advancements than square barriers. We point out that close to thresholds of new bound states the time advancement increases considerably, while, at the same time, the transmission probability is large, which facilitates the possible observation of the enhanced time advancement.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Bounds and enhancements for negative scattering time delays

et al. 2002

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“…This extraordinary physical concept was, first, proposed by Veselago in 1968 [27] and then, experimented in the early 2000s by Pendry and Smith [28][29][30][31]. Several experiments confirmed the physical existence of the superluminal and NGD phenomena with negative refractive index media [32][33][34][35][36][37]. In the presence of losses, the NGD generated by NGD passive media is accompanied by excessive losses [15][16][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Neutralization of LC- and RC-Disturbances with Left-Handed and NGD Effects

Ravelo

2013

AEM

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This paper focus is on the neutralization technique of the unwanted parasitic effects on radio frequencies (RF) and digital electronic circuits. Most of parasitic effects induced in these circuits can be modeled by RC-and LC-networks. For canceling these disturbing effects, we can proceed with operation as transfer function neutralization in the considered operating frequency bands. The neutralization presented in this paper is developed by using first, a lefthanded (LH) and negative group delay (NGD) circuits inspired from metamaterials. The theoretical approach illustrating the RC-and LC-effects neutralization is described. Synthesis relations enabling to determine the elements of required LH and NGD circuit correctors in function of the perturbation parameters are established. Numerical and experimental demonstrators are presented to validate the technique proposed.

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“…1(b)] and was investigated in Refs. [18,19,30,31]. The consistent mathematical description of this case can be obtained using Floquet theory [32].…”

Section: Two Pump Fields (Raman Doublet)mentioning

confidence: 99%

Superluminal two-color light in a multiple Raman gain medium

et al. 2014

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We investigate theoretically the formation of two-component light with superluminal group velocity in a medium controlled by four Raman pump fields. In such an optical scheme only a particular combination of the probe fields is coupled to the matter and exhibits superluminal propagation; the orthogonal combination is uncoupled. The individual probe fields do not have a definite group velocity in the medium. Calculations demonstrate that this superluminal component experiences an envelope advancement in the medium with respect to the propagation in vacuum.

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Signal Velocity, Causality, and Quantum Noise in Superluminal Light Pulse Propagation

Cited by 190 publications

References 18 publications

Bounds and enhancements for negative scattering time delays

Bounds and enhancements for negative scattering time delays

Neutralization of LC- and RC-Disturbances with Left-Handed and NGD Effects

Superluminal two-color light in a multiple Raman gain medium

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