Experiments with a Mesomaser

Lange, Wolfgang; Walther, H.

doi:10.12693/aphyspola.86.7

Cited by 5 publications

(5 citation statements)

References 27 publications

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“…For example, the scheme of [15] could be used for this purpose, but with the decreased (at least up to 5 MHz) modulation frequency. The presented results may also contribute to better understanding of experiments of H.Walther and W.Lange [28] on intracavity excitation of an atom by bichromatic field. …”

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confidence: 65%

Revivals for a two-level atom in a free space under bichromatic excitation

Kilin

Karlovich

2004

Laser Phys. Lett.

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A two level atom in a free space excited by a bichromatic symmetrical field is shown to display the property of revivals for relatively small frequency detunings and a large driving field amplitude. The property of revivals is a bright physical phenomenon which is usually associated with the quantum properties of an atom-field interactions in the framework of the Jaynes-Cummings model [1]. In fact this phenomenon predicted in [2] has been observed by Herbert Walther with coworkers in 1987 [3] for a single two-level atom interacting with a quantized field mode in a high-Q cavity. Mathematically the revivals arise as a result of the quasi-equidistant spectrum of the Jaynes-Cummings Hamiltonian for a large number of photons in the mode and the peak-like form of the Fourier spectrum of atomic and field variables at the initial coherent state for the field mode. But it is obvious that there are other physical systems with the same spectral properties, and therefore they can exhibit revivals too. As we show in this Letter one of such systems is a bichromatically driven two-level atom in a free space, and what's more, the driving field is classical.The problem of bichromatically driven two-level atom dynamics and spectra has received considerable attention since the 70's. Initial and subsequent works in this area indicate that the system presents qualitatively new types of spectral [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and dynamical [22][23][24][25][26][27] behavior compared with the monochromatic excitation. The main activity has been concentrated on spectral peculiarities connected with subharmonic resonances [8]. Dynamical properties of the system have received much less attention. For example, it has been predicted [22,23] and observed [27] that bichromatically driven atoms exhibit dynamical behavior that's strongly dependent on the relative phase of the excitation field components.In this Letter, we report a new type of dynamical behavior of a bichromatically driven two-level atom which can be observed for the special case wherein the field components have very small frequency detunings from atomic resonance and the intensities of both components are strong enough. For this case many spectral components of the atomic variables are exited with a definite phase relations between them. As a result, synchronization (in other terminology, constructive interference) between the components occurs at definite moments, giving the revivals in the temporal behavior of the atomic variables.Let a two-level atom driven by a bichromatic coherent field with amplitudeinteract with a continuum of electromagnetic free field modes which are in the vacuum state. The atom also interacts with a relaxation bath that leads to an additional dephasing of the atomic polarization. We restrict ourselves to the simplest case of bichromatic excitation -with equal amplitudes of the field components (E 1 = E 2 = E 0 ) and symmetrically located field frequencies ω 1 − ω 21 = ω 21 − ω 2 = , where ω 21 is the ato...

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confidence: 65%

Revivals for a two-level atom in a free space under bichromatic excitation

Kilin

Karlovich

2004

Laser Phys. Lett.

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“…Moreover, a very narrower peak (than before) is imposed on the central peak, a signature of an auxiliary in-phase radiation interference [109]. It has been reported that [116], if the external excitation of the cavity mode is smaller than or comparable to the eld radiated by the atoms, cooperative atomic behavior is expected.…”

Section: Effect Of Turning On the Classical Pumping For Various Detun...mentioning

confidence: 90%

“…In fact, on systems with bichromatic or monochromatic driving, the Hamiltonian is necessarily time dependent. Consequently, the spectra acquires such a complex structure [116]. Therefore, stationary energy levels and steady-state spectra do not exist and all expectations depend on time.…”

Section: Response Of Atomic Emission Spectra To the Classical Pump Onlymentioning

confidence: 99%

“…Moreover, an interesting feature is that, due to thermalization of coherent eld by classical pumping [41] on super strong classical pumping and large n, spectrum peaks approach zero frequency. It has been argued that, if the eld is suf ciently strong, complete decoupling of the atom from the cavity mode can be achieved [116], hence, sequence excitation and deexcitation revoked, thus, no spectrum could be produced. Worthy noting that, thermalization occurs partially on the low mean photon number, thus such a behavior may be never seen.…”

Section: Response Of Atomic Emission Spectra To the Classical Pump Onlymentioning

confidence: 99%

“…Consequently, perfect periodicity can be clearly visible in entanglement behavior. It has been argued that [116], when the cavity is detuned from the atomic resonance, decay is inhibited. Since there is no mode available for the atom to interact with, it cannot emit the stored energy and the lifetime in the excited state is increased.…”

Section: Effect Of the Change In Detuning Width In Absence Of Classic...mentioning

confidence: 99%

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Cooperative emission spectra as an efficient key probe of qubits pair entanglement along with field state tomography: an effective response to nonlinearity and classical drive power

Ateto¹

2020

J. Phys. B: At. Mol. Opt. Phys.

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Cooperative atomic emission spectrum as a key probe of entanglement dynamics of an independent and a classically-pumped qubits pair is showed and investigated. The qubits are initially maximally-entangled while they penetrate a detuned, single-photon and coherent cavity embedded in nonlinear media. The system Hamiltonian; that is a nonlinear and a time-dependent system, is diagonalized and the time evolution unitary operator in an exact form is derived. Various characteristics are monitored while observations are theoretically documented—via tracing the field state tomography—and experimentally calibrated. Cooperation and decoherence as well as the statistics of the emitted radiation are discussed and analyzed in terms of the other phenomena. We show that, a measurement of the spectrum outputs represent a highly effective key calibration for entanglement attributes, where complete time dynamics may be predicted with a high considerable accuracy. The most striking feature realized is that, on high detuned interaction, a full matching of these phenomena outputs can be achieved regardless of the absence or presence or pumping. Once the pumping starts, a partial dephasing is encouraged, thus, the spectrum is inversely but slightly affected, nevertheless, matching remains highly closed. Within various surroundings of Kerr materials of different Kerr constants, that is an additional source of an effective dephasing, spectrum rapidly oscillates and so also entanglement that shows rapid Rabi oscillations during its fast degradation depending on the detuning width. However, on measuring the intracavity field state tomography, measurements confirm such a matching, that is, calibration is well documented.

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The Wigner functional of the electromagnetic field

Bialynicki‐Birula

2000

Optics Communications

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Experiments with a Mesomaser

Cited by 5 publications

References 27 publications

Revivals for a two-level atom in a free space under bichromatic excitation

Revivals for a two-level atom in a free space under bichromatic excitation

Cooperative emission spectra as an efficient key probe of qubits pair entanglement along with field state tomography: an effective response to nonlinearity and classical drive power

The Wigner functional of the electromagnetic field

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