Propagation and amplitude correlation of pairs of intense pulses interacting with a double-Λ system

Cerboneschi, E.; Arimondo, E.

doi:10.1103/physreva.54.5400

Cited by 36 publications

(11 citation statements)

References 36 publications

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“…This type of transparency occurs under population trapping conditions in this system and no additional laser field is required. This latter fact distinguishes this work from recent propagation studies in multilevel atoms [1][2][3][4][6][7][8][9][10][11][12][13][14]. Apart from a fundamental interest in pulse-preserving propagation in dielectric media, an interesting aspect in our case is that the required coherence is maintained by the presence of dissipation.…”

Section: Transparency Induced Via Decay Interferencementioning

confidence: 88%

“…-k Dispersion and absorption properties of multilevel media can be modified through the introduction of a second, or coupling, laser pulse. The coherent interaction between the laser fields and the medium can result in phenomena such as electromagnetically induced transparency and matched pulse propagation [1] and the creation and propagation of "adiabatons" [2][3][4], a general class of solitonlike pulses that occur in adiabatically evolving systems [5]. Other remarkable properties have also been discussed [6][7][8][9][10][11][12].…”

Section: Transparency Induced Via Decay Interferencementioning

confidence: 99%

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Transparency Induced via Decay Interference

1999

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We demonstrate that decay interference from the two upper levels of a four-level system can lead to loss-free propagation of a single, short laser pulse through an absorbing medium. In contrast to recent investigations of loss-free propagation in three-level media, no second coupling laser pulse is required. [S0031-9007(99) PACS numbers: 42.50. Gy, 42.50.Md, Dispersion and absorption properties of multilevel media can be modified through the introduction of a second, or coupling, laser pulse. The coherent interaction between the laser fields and the medium can result in phenomena such as electromagnetically induced transparency and matched pulse propagation [1] and the creation and propagation of "adiabatons" [2-4], a general class of solitonlike pulses that occur in adiabatically evolving systems [5]. Other remarkable properties have also been discussed [6][7][8][9][10][11][12]. Experimental investigations of adiabatons have been performed by Harris and co-workers [13]. As discussed by Eberly and co-workers [14], many of the above phenomena are related to coherent population trapping and the creation of "dark states" [15]. If the laser fields are applied adiabatically [5], then the medium can, under trapping conditions, establish a dark state leading to transparency in the medium.In the above mentioned processes it is crucial to have at least two laser pulses as both are used to create the necessary coherence. In this Letter we show that interference between decay channels can make a medium transparent to a single, short laser pulse. In this scheme interference inherent in the decay is exploited so that no coupling laser field is required for transparency. This type of interference was used in the original proposal of Harris [16] for lasing without inversion and has attracted much attention with regard to fluorescence quenching and related phenomena [17][18][19][20]. As in the theory of adiabatons our scheme also relies on the adiabatic evolution of a dark state of the system depicted in Fig. 1.In this Letter we focus on the case of an atomic medium and the decay process we consider is spontaneous emission. It should be emphasized that our analysis can be equally applied to other systems where such interference exists. Examples include spontaneous emission in molecules [21], processes involving autoionizing resonances [22], and semiconductor quantum well systems where the decay occurs via tunneling processes [23,24].We begin our analysis with the Maxwell-Schrödinger equations of motion for the system of Fig. 1. The wave function of the system is first expanded in terms of the field-free atomic states multiplied by the corresponding space and time-dependent amplitudes c m ͑z, t͒ (m 0, 1, 2) and c 3,k ͑z, t͒ of, respectively, the atomic and vacuum amplitudes. The laser pulse is taken to propagate in the z direction. Then c 3,k ͑z, t͒ is formally eliminated and the Weisskopf-Wigner theory of spontaneous emission applied. The result is the following set of equations in the rotating wave and the slowly varying enve...

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Section: Transparency Induced Via Decay Interferencementioning

confidence: 88%

Section: Transparency Induced Via Decay Interferencementioning

confidence: 99%

Transparency Induced via Decay Interference

1999

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“…(see Figure 8). One thus has to do with two Λ's: b − a − c and b − d − c. Light propagation in a medium of such a configuration has been investigated in a number of papers [21][22][23][24][25]. It was shown in particular that an adiabatic propagation was possible only for such pulses thatform in some special cases.…”

Section: Double λ Configurationmentioning

confidence: 99%

Light Propagation in Optically Dressed Media

Raczyński¹,

Zaremba²,

Zielińska-Kaniasty³

2013

Open Systems, Entanglement and Quantum Optics

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“…The weakness of optical nonlinearities can be compensated by photon confinement in a high-Q cavity [3]. A promising avenue has been opened by studies of enhanced nonlinear coupling via electromagnetically induced transparency (EIT) in atomic vapors in the presence of classical driving fields, which induce coherence between atomic levels [4,5]. These studies have predicted the ability to achieve an appreciable nonlinear phase shift of extremely weak optical fields [6] or a twophoton switch [7,8], using the driven N -configuration of atomic levels.…”

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confidence: 99%

Symmetric photon-photon coupling by atoms with Zeeman-split sublevels

2002

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We propose a simple scheme for highly efficient nonlinear interaction between two weak optical fields. The scheme is based on the attainment of electromagnetically induced transparency simultaneously for both fields via transitions between magnetically split F = 1 atomic sublevels, in the presence of two driving fields. Thereby, equal slow group velocities and symmetric cross-coupling of the weak fields over long distances are achieved. By simply tuning the fields, this scheme can either yield giant cross-phase modulation or ultrasensitive two-photon switching. PACS number(s): 42.50.Gy, 03.67.-aThe weakness of optical nonlinearities in conventional media precludes the effective interaction of extremely feeble fields containing few photons only [1]. This weakness sets a limit on the performance of ultrasensitive photonic elements (switches and couplers), as well as on nonclassical ("squeezing") effects. It is also the main impediment towards constructing quantum logic gates, quantum teleportation and cryptography schemes operating at the few-photon level [2]. The weakness of optical nonlinearities can be compensated by photon confinement in a high-Q cavity [3]. A promising avenue has been opened by studies of enhanced nonlinear coupling via electromagnetically induced transparency (EIT) in atomic vapors in the presence of classical driving fields, which induce coherence between atomic levels [4,5]. These studies have predicted the ability to achieve an appreciable nonlinear phase shift of extremely weak optical fields [6] or a twophoton switch [7,8], using the driven N -configuration of atomic levels. The main hindrance of such schemes is the mismatch between the group velocities of the field that is subject to EIT and its nearly-free propagating partner, which severely limits their effective interaction length [9].In the present paper we propose a scheme that can remove this bottleneck, by basically modifying the nonlinear interaction of weak optical fields: in contrast to all currently known schemes, it affects both fields in a completely symmetric fashion, rendering their group velocities equal. It thereby allows their cross-coupling over very long distances and brings it to its ultimate limit of efficiency. This scheme relies solely on an intraatomic process that causes simultaneous EIT for both fields interacting with magnetically (Zeeman-) split sublevels in the presence of two driving fields. Remarkably, by simply tuning the fields, this scheme can either yield giant crossphase modulation or ultrasensitive two-photon switching in vapor [10]. It may therefore substantially advance the optical processing and communication of quantum information in conventional media, without resorting to photonic crystals [11] or resonators [12].We first outline the proposed setup. Two weak optical fields E a and E b , having σ polarization along the y axis, propagate in the atomic medium along the z axis. Two π-(x-)polarized CW driving fields E d1,2 and a static xoriented magnetic field B are applied (Fig. 1-Left Inset). In...

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Propagation and amplitude correlation of pairs of intense pulses interacting with a double-Λ system

Cited by 36 publications

References 36 publications

Transparency Induced via Decay Interference

Transparency Induced via Decay Interference

Light Propagation in Optically Dressed Media

Symmetric photon-photon coupling by atoms with Zeeman-split sublevels

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