共查询到20条相似文献,搜索用时 15 毫秒
1.
Constantine Mavroyannis 《Optics Communications》1979,29(1):80-86
We consider the excitation spectrum arising from the interaction between a three-level atom and a strong electromagnetic field in the frequency region where the two atomic transition frequencies are nearly equal to once and twice the frequency of the pump field respectively. Detailed expressions for the spectral functions are derived describing the two-, one- and zero-photon excitations as well as those arising from the coupling between them, in the limit of high photon densities. The zero-photon excitations describe low frequency modes induced by the pump field under resonance conditions. 相似文献
2.
Localization to the ground state of axial motion is demonstrated for a single, trapped atom strongly coupled to the field of a high finesse optical resonator. The axial atomic motion is cooled by way of coherent Raman transitions on the red vibrational sideband. An efficient state detection scheme enabled by strong coupling in cavity QED is used to record the Raman spectrum, from which the state of atomic motion is inferred. We find that the lowest vibrational level of the axial potential with zero-point energy variant Planck's over 2 h omega a/2kB = 13 microK is occupied with probability P0 approximately 0.95. 相似文献
3.
We present a theoretical formalism for resonance fluorescence radiating from a two-level system (TLS) driven by any periodic driving and coupled to multiple reservoirs. The formalism is derived analytically based on the combination of Floquet theory and Born–Markov master equation. The formalism allows us to calculate the spectrum when the Floquet states and quasienergies are analytically or numerically solved for simple or complicated driving fields. We can systematically explore the spectral features by implementing the present formalism. To exemplify this theory, we apply the unified formalism to comprehensively study a generic model that a harmonically driven TLS is simultaneously coupled to a radiative reservoir and a dephasing reservoir. We demonstrate that the significant features of the fluorescence spectra, the driving-induced asymmetry and the dephasing-induced asymmetry, can be attributed to the violation of detailed balance condition, and explained in terms of the driving-related transition quantities between Floquet-states and their steady populations. In addition, we find the distinguished features of the fluorescence spectra under the biharmonic and multiharmonic driving fields in contrast with that of the harmonic driving case. In the case of the biharmonic driving, we find that the spectra are significantly different from the result of the RWA under the multiple resonance conditions. By the three concrete applications, we illustrate that the present formalism provides a routine tool for comprehensively exploring the fluorescence spectrum of periodically strongly driven TLSs. 相似文献
4.
Numerical computations are presented for the excitation spectra arising from the interaction between a three-level atom in the cascade configuration and a strong electromagnetic field whose frequency mode is initially populated. The excitation spectra are considered when the laser field is at resonance with the equally spaced levels of the atom as well as a function of the detunings. The physical process of optical amplification occurs without population inversion and it is more pronounced when the laser field is detuned than when it is at resonance. The shapes of the spectral lines for a number of side-bands are of the absorption-amplification type rather than that of the absorption one. In the presence of detunings as well as in the cooperative two-photon cascade process, the resulting spectra are far more complicated than those occuring at resonance. Results of numerical calculations for a wide range of Rabi frequencies and detunings are presented graphically. 相似文献
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6.
G. Li S. Wu P. Zhou 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2001,15(2):267-277
The dressed-state populations and the resonance fluorescence spectrum of a V-type three-level atom driven by a strong coherent
field and a weak stochastic one simultaneously are investigated. There can be significant population inversion due to the
effect of the stochastic field. The atomic resonance fluorescence spectrum can be controlled by adjusting the frequency difference
between the coherent field and the stochastic one and the coherent Rabi frequency. Peak suppression and line narrowing occur
under appropriate conditions.
Received 23 June 2000 and Received in final form 18 January 2001 相似文献
7.
S. J. Akhtarshenas M. Khezrian 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2010,57(2):271-279
In this paper, we investigate the entanglement dynamics anddecoherence in the interacting system of a strongly driventwo-level atom and a single mode vacuum field in the presence ofdissipation for the cavity field. Starting with an initial productstate with the atom in a general pure state and the field in avacuum state, we show that the final density matrix is supportedon \({\mathbb C}^2\otimes{\mathbb C}^2\) space, and therefore, theconcurrence can be used as a measure of entanglement between theatom and the field. The influences of the cavity decay on thequantum entanglement of the system are also discussed. We alsoexamine the Bell-CHSH violation between the atom and the field andshow that there are entangled states for which the Bell-BCSHinequality is not violated. Using the above system as a quantumchannel, we also investigate the quantum teleportation of ageneric qubit state and also a two-qubit entangled state, and showthat in both cases the atom-field entangled state can be useful toteleport an unknown state with fidelity better than any classicalchannel. 相似文献
8.
9.
Wallraff A Schuster DI Blais A Gambetta JM Schreier J Frunzio L Devoret MH Girvin SM Schoelkopf RJ 《Physical review letters》2007,99(5):050501
Sideband transitions are spectroscopically probed in a system consisting of a Cooper pair box strongly but nonresonantly coupled to a superconducting transmission line resonator. When the Cooper pair box is operated at the optimal charge bias point, the symmetry of the Hamiltonian requires a two-photon process to access sidebands. The observed large dispersive ac-Stark shifts in the sideband transitions induced by the strong nonresonant drives agree well with our theoretical predictions. Sideband transitions are important in realizing qubit-photon and qubit-qubit entanglement in the circuit quantum electrodynamics architecture for quantum information processing. 相似文献
10.
An optomechanical cavity embedded with a V-type three-level atom is exploited to control single-photon transport in a one-dimensional waveguide. The effects of the atom–cavity detuning, the optomechanical effect,the coupling strengths between the cavity and the atom or the waveguide, and the atomic dissipation on the single-photon transport properties are analyzed systematically. Interestingly, the single-photon transmission spectra show multiple double electromagnetically induced transparency. Moreover, the double electromagnetically induced transparency can be switched to a single one by tuning the atom–cavity detuning. 相似文献
11.
本文从含有弛豫项的光与二能级原子相互作用的布洛赫(Block)方程出发,利用计算机进行数值求解,在强共振激发条件下,给出了几种不同的激光脉冲(包括常见的高斯脉冲)激发的原子共振荧光谱,获得了原子在瞬态辐射过程中的一些新现象。 相似文献
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13.
The resonance fluorescence spectrum of a two-level atom in a classical light field, whose phase is changed by a feedback system
by π after the detection of each spontaneous photon, has been calculated. The spectrum resembles the well-known Rautian-Mollow
triplet. However, the sidebands become sharply asymmetric at a nonzero frequency detuning of the light field from the atomic
resonance transition. In addition, the spectrum retains the pronounced triplet shape even beyond the secular approximation,
when the sidebands of the Rautian-Mollow structure become unresolved in the absence of the feedback. 相似文献
14.
A strong resonant interaction of a two-level atom with a dielectric microsphere is studied on the basis of quantum electrodynamics.
The initial condition considered is one in which the atom is initially excited and the resonant mode of the microsphere has
been excited by a single photon. The spectrum of two emitted photons depends strongly on the method used to excite the microsphere,
i.e., on the spatial distribution of the photon energy. The most characteristic feature of the two-photon fluorescence spectrum
is a strong energy correlation of the emitted photons. This correlation is expressed in the fact that the energies of the
emitted photons are related by the equation of an ellipse (ω+ω
2−2ω
vA
)2+3(ω
1−ω
2)2= 4Ω
Rabi
2
. The relation between the results obtained and the predictions of the theory of dressed states is discussed.
Pis’ma Zh. éksp. Teor. Fiz. 70, No. 3, 192–197 (10 August 1999) 相似文献
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Statistics of photoemission events into the components of a triplet of resonance fluorescence of a two-level atom in a classical optical field, the phase of which changes by π upon the detection of spontaneous photon, is compared with the case when the feedback is absent. In contrast to the known problem on the statistics of resonance fluorescence of a two-level atom, a grouping of photocounts should be observed in each separate side component of the triplet. Anticorrelation of photoemission into side components is also predicted, and the type of correlations between the emission into the central component of the triplet and into any of the side ones can be controlled by varying the detuning of the radiation frequency from the resonant value. 相似文献
17.
Shi-Biao Zheng 《Optics Communications》2007,273(2):460-463
We propose a scheme to realize strong squeezing for a cavity field with a single three-level atom. In the scheme the atom is sent through the cavity initially filled with a coherent field. The atom dispersively interacts with the cavity field, which is displaced by a microwave resource during the interaction. Then, a selective measurement on the atom collapses the field to a superposition of an even coherent state with a vacuum state, which exhibits strong squeezing. The scheme can also be generalized to the two-mode case. 相似文献
18.
The resonance interaction of a two-level atom with a continuum of free-space modes modified by the presence of a dielectric
microsphere (modified free-space modes — MFSMs) is studied. In the case that quantized MFSMs are initially excited within
the contour of one of the resonance modes of the microsphere, the spectrum of emitted photons depends strongly on the excitation
method. Under optimal excitation conditions efficient excitation of the atom accompanied by the formation of a Rabi doublet
in the fluorescence spectrum occur. As the excitation conditions depart from optimality, the spectrum becomes a triplet. If
the departure from optimality of excitation is large, the atom remains essentially unexcited, and the fluorescence spectrum
has a singlet character.
Pis’ma Zh. éksp. Teor. Fiz. 68, No. 2, 115–120 (25 July 1998) 相似文献
19.
We report an investigation of the resonance fluorescence spectrum of NO2 excited by several laser lines. Sixty transitions, mostly in ν2 progressions of the ground state, have been assigned. Analysis of the spectra extend the knowledge of the ground state constants, especially of the anharmonic coefficients. It is possible to establish that transitions are occurring to a 2B1 state and to a 2B2 state in the same energy region. 相似文献
20.
Schuster DI Wallraff A Blais A Frunzio L Huang RS Majer J Girvin SM Schoelkopf RJ 《Physical review letters》2005,94(12):123602
We have performed spectroscopy of a superconducting charge qubit coupled nonresonantly to a single mode of an on-chip resonator. The strong coupling induces a large ac Stark shift in the energy levels of both the qubit and the resonator. The dispersive shift of the resonator frequency is used to nondestructively determine the qubit state. Photon shot noise in the measurement field induces qubit level fluctuations leading to dephasing which is characteristic for the measurement backaction. A crossover in line shape with measurement power is observed and theoretically explained. For weak measurement a long intrinsic dephasing time of T2>200 ns of the qubit is found. 相似文献