Influence of finite bandwidth on the propagation of information in fast- and slow-light media

Amano, Heisuke; Tomita, Makoto

doi:10.1103/physreva.93.063854

Cited by 4 publications

(4 citation statements)

References 28 publications

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“…It is well known that atomic coherence leads to normal or anomalous dispersion, which corresponds to subluminal or superluminal light propagation. A series of experiments have demonstrated both subluminal and superluminal light propagation [6][7][8][9][10]. Subluminal light propagation is a direct consequence of the normal dispersion that occurs between two absorption lines in an electromagnetically induced transparency (EIT) set up.…”

Section: Introductionmentioning

confidence: 99%

Switching from normal dispersion to anomalous dispersion in a four-level atomic system

Kang¹,

Meng²,

Qu³

et al. 2021

Laser Phys.

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The manipulation of the group velocity of light is very important in further information processing and quantum network. It is well known that subluminal and superluminal light propagation can be obtained by controlling the dispersion property of the experimental medium. In order to realize the switching from normal dispersion to anomalous dispersion at the same frequency, we investigate the dispersion and absorption properties of a four-level atomic system. By adjusting the intensity of an incoherent pump, we get transparent normal dispersion and lossless anomalous dispersion, which lead to subluminal and superluminal light propagation respectively. For a strong incoherent pump, the intensity of the coherent coupling field also can be used to realize a similar switching effect.

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Section: Introductionmentioning

confidence: 99%

Switching from normal dispersion to anomalous dispersion in a four-level atomic system

Kang¹,

Meng²,

Qu³

et al. 2021

Laser Phys.

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“…Interestingly, in the case of the infinite dipole chain there exist spin waves with negative group velocity, see section 6. Systems with negative group velocity have recently found much attention in optics, see, e. g. [26], as well as in the investigation of meta-materials, see, e. g. [27], [28].…”

Section: Introductionmentioning

confidence: 99%

“…Systems with negative group velocity have recently found much attention in optics, see, e.g. [26], as well as in the investigation of metamaterials, see, e.g. [27,28].…”

Section: Introductionmentioning

confidence: 99%

Spin waves in rings of classical magnetic dipoles

Schmidt

Schröder

Luban

2017

J. Phys. A: Math. Theor.

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We theoretically and numerically investigate spin waves that occur in systems of classical magnetic dipoles that are arranged at the vertices of a regular polygon and interact solely via their magnetic fields. There are certain limiting cases that can be analyzed in detail. One case is that of spin waves as infinitesimal excitations from the system's ground state, where the dispersion relation can be determined analytically. The frequencies of these infinitesimal spin waves are compared with the peaks of the Fourier transform of the thermal expectation value of the autocorrelation function calculated by Monte Carlo simulations. In the special case of vanishing wave number an exact solution of the equations of motion is possible describing synchronized oscillations with finite amplitudes. Finally, the limiting case of a dipole chain with N −→ ∞ is investigated and completely solved.

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“…The concept of superluminal pulse propagation, wherein optical pulses can propagate through dispersive media with group velocities greater than c, or even negative, has therefore stimulated much interest in causality over the years [7][8][9][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. It is accepted that, while the envelop of a pulse can be modified such that the peak appears to travel faster than c, the information is a fundamental quantity bound to propagate at c or slower [7,8,16,33,34].…”

Section: Introductionmentioning

confidence: 99%

Causality and information transfer in simultaneously slow- and fast-light media

Swaim

Glasser

2017

Opt. Express

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Abstract:We demonstrate the simultaneous propagation of slow-and fast-light optical pulses in a four-wave mixing scheme using warm potassium vapor. We show that when the system is tuned such that the input probe pulses exhibit slow-light group velocities and the generated pulses propagate with negative group velocities, the information velocity in the medium is nonetheless constrained to propagate at, or less than, c. These results demonstrate that the transfer and copying of information on optical pulses to those with negative group velocities obeys information causality, in a manner that is reminiscent of a classical version of the no-cloning theorem. Additionally, these results support the fundamental concept that points of non-analyticity on optical pulses correspond to carriers of new information.

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Influence of finite bandwidth on the propagation of information in fast- and slow-light media

Cited by 4 publications

References 28 publications

Switching from normal dispersion to anomalous dispersion in a four-level atomic system

Switching from normal dispersion to anomalous dispersion in a four-level atomic system

Spin waves in rings of classical magnetic dipoles

Causality and information transfer in simultaneously slow- and fast-light media

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