Abstract Quantum Beats From Four

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Abstract Quantum Beats From Four

2019-08-13T21:08:09+00:00
  • Quantum Beat - an overview ScienceDirect Topics

    Quantum beats may be observed for any spectroscopic method and for any time resolution, including the pico- and femtosecond time scale. However, the shorter the pulse, the broader is the excitation, and the larger the number of indistinguishable energy levels. This results in producing many different quantum beats that may be averaged to zero. The selection of the pulse duration depends on the ...

  • Polarization entanglement and quantum beats of

    17/09/2015  When allowing both decay paths, we observe quantum beats in time-resolved correlation measurements. Export citation and abstract BibTeX RIS Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence .

  • Cited by : 7
  • Quantum beats from four-wave mixing in Rubidium

    We describe the measurements of the cross-correlation function of photon pairs at 780 nm and 1367 nm showing quantum beats from Four-Wave Mixing (FWM) generated in Rubidium 87

  • OSA Dynamics of triple quantum beats retrieved

    A theoretical model of coupled four-wave mixing (FWM) processes comprising five atomic energy levels was proposed to investigate the coherent characteristics of atomic wave packets using perturbation theory. As several states in atoms are coherently excited by a two-photon transition, triple coupled FWM can be produced, and triple quantum beats associated with the atomic energy levels are ...

  • Effects of correlation between inhomogeneously

    Effects of correlation between inhomogeneously broadened transitions on quantum beats in transient four-wave mixing Cundiff, S. T. Abstract. The transient four-wave-mixing signal from a three-level system is calculated in the short-pulse limit including a general distribution function for the energies of the levels between which beating occurs. This allows an examination of the effects of ...

  • Dynamics of triple quantum beats retrieved from

    Dynamics of triple quantum beats retrieved from coupled four-wave mixing signals

  • Intrinsic Quantum Beats of Atomic Populations and

    In the coherently trapped populations of a four-level atom, we demonstrated the quantum beats with different mechanism, which originate from the interference between transition channels with different dipole moments. The beat frequency is determined by the intrinsic atomic parameters, i.e., the spacing of upper levels and ratio of dipole moments.

  • Intrinsic Quantum Beats of Atomic Populations and

    In the coherently trapped populations of a four-level atom, we demonstrated the quantum beats with different mechanism, which originate from the interference between transition channels with...

  • Quantum beats - Wikipedia

    In physics, quantum beats are simple examples of phenomena that cannot be described by semiclassical theory, but can be described by fully quantized calculation, especially quantum electrodynamics.In semiclassical theory (SCT), there is an interference or beat note term for both V-type and -type atoms. [clarification needed] However, in the quantum electrodynamic (QED) calculation, V

  • Molecular vibrations-induced quantum beats in two ...

    Quantum beats in nonlinear spectroscopy of molecular aggregates are often attributed to electronic phenomena of excitonic systems, while nuclear degrees of freedom are commonly included into models as overdamped oscillations of bath constituents responsible for dephasing. However, molecular systems are coupled to various high-frequency molecular vibrations, which can cause the spectral beats ...

  • Time-integrated four-wave mixing in GaN and

    Abstract. We report on the study of quantum beats in the time-integrated four-wave mixing signal in reflection geometry from a pair of excitons with different valence orbitals in GaN and ZnSe. We observe a π-phase shift between quantum beats in the co- and cross-linear polarization configuration, and nearly 100% modulation of the signal for both materials. In the co-circular polarization ...

  • Nature of nonlinear four-wave-mixing beats in ...

    Nature of nonlinear four-wave-mixing beats in semiconductors. Lyssenko VG, Erland J, ... Quantum beats of light hole and heavy hole excitons in quantum wells . Leo. Applied Physics Letters, (1) Observation of quantum beats in the resonance fluorescence of free excitons. Langer V V, Stolz H, von der Osten W . Phys. Rev. Lett., (8):854-857 MED: 10042098 Absorption quantum beats of ...

  • Quantum beats of excitons in quantum wells -

    01/01/1992  Abstract. We review our observations of quantum beats of excitons in quantum wells arising from (i) heavy hole-light hole splitting, (ii) exciton splitting due to fluctuations in the well-width of quantum wells, and (iii) free and bound excitons, using the techniques of time resolved four-wave-mixing (FWM) and pump-and-probe (PP). We also discuss quantum beats in appropriately biased ...

  • Quantum beats from four-wave mixing in Rubidium 87

    QUANTUM BEATS FROM FOUR-WAVE MIXING IN RUBIDIUM 87 25 FIGURE 3. (Color online) Time-delayed coincidence counts when the pump beams couple the atomic transitions 5S1=2; F = 2! 5P1=2; F 0 = 1 and 5P 1=2; F 0 = 1! 6S 1=2; F 00 = 2 in 87Rb. The line joins the data points, and note the suppressed zero in the vertical axis. The inset shows the hyperfine structure of the 5P3=2 atomic

  • OSA Polarization dependent quantum beats of ...

    The polarization dependence of quantum beats from the A-exciton and the B-exciton in a GaN sample of exceptional quality is studied with four-wave mixing experiments. When changing the incident polarizations from collinear to crossed linear, a π-phase shift of the beats is observed while the decay rate remains unchanged. This confirms previous theoretical predictions.

  • [1505.05606] Polarization entanglement and

    21/05/2015  Abstract: We characterize correlations in polarization and time of photon pairs generated from a cold cloud of Rb-87 atoms via a four-wave mixing process in a cascade level scheme. Quantum state tomography reveals entangled polarization states of high purity for each of the decay paths through two different intermediate hyperfine levels. When allowing both decay paths, we observe quantum beats ...

  • Polarization entanglement and quantum beats of photon ...

    Polarization entanglement and quantum beats of photon pairs from four-wave mixing in a cold 87 Rb ensemble To cite this article: Gurpreet Kaur Gulati et al 2015 New J. Phys. 17 093034 View the article online for updates and enhancements. Related content A source of polarization-entangled photon pairs interfacing quantum memories with telecom photons C Clausen, F Bussières, A Tiranov et al ...

  • Geometrical representation of the equations for

    Abstract. Equations for solving a quantum beat problem in a three-level system, which determine two complex variables of time dependence, are rewritten in terms of four real functions constructed from the two complex variables. The Minkowski space is reasonably introduced in order to represent the time evolution of the four real functions as the motion of a four-dimensional vector, though the ...

  • Quantum Beats from Entangled Localized

    Recent experiments report observations of quantum interference between plasmon resonances, inviting descriptions of plasmon–photon interaction using methods from quantum optics. Here we demonstrate, using a Heisenberg–Langevin approach, that the radiation emitted from the localized surface plasmon resonances of a mixed-metal heterodimer may exhibit observable, beat frequency interferences ...

  • ABSTRACT FOR USE IN QUANTUM BEAT EXPERIMENTS

    ABSTRACT INVESTIGATION OF DOUBLE RESONANCE SPECTROSCOPY OF IODINE MOLECULES FOR USE IN QUANTUM BEAT EXPERIMENTS by Corey McDonald The resonant B3ƒ+ u ˆ X0+g and resonant E0+ g,D 02 g ˆ B3ƒ+ u ˆ X0+g transitions of I2 vapor have been studied by direct observation of °uorescence emitted from the B, E and D0 states, respectively.

  • Quantum Fourier analysis PNAS

    Abstract. Quantum Fourier analysis is a subject that combines an algebraic Fourier transform (pictorial in the case of subfactor theory) with analytic estimates. This provides interesting tools to investigate phenomena such as quantum symmetry. We establish bounds on the quantum Fourier transform F, as a map between suitably defined L p spaces, leading to an uncertainty principle for relative ...

  • CiteSeerX — Four Kinds of Quantum Beats in

    Abstract. This paper reports observation of four kinds of luminescence quantum beats (QBs) in semiconductor quantum dots (QDs). QBs of Zeeman-split bright heavy-hole excitons under the longitudinal magnetic field and QBs coming from the electron spin Larmor precession under the transverse magnetic field were observed for strain-induced GaAs QDs. Another type of QBs between

  • [1507.04198] Multiple quantum beats of quantum

    15/07/2015  Download PDF Abstract: Multiple quantum beats of a system of the coherently excited quantum confined exciton states in a high-quality heterostructure with a wide InGaAs/GaAs quantum well are experimentally detected by the spectrally resolved pump-probe method for the first time. The beat signal is observed as at positive as at negative delays between the pump and probe pulses.

  • Study of Multiple Quantum Beats in Atomic

    Abstract: A theoretical model consisting of 5 energy levels in coupled four-wave mixing processes was proposed to analyze the coherent characteristics of atomic wavepackets using perturbative theory. The equations of motions of the density matrix were derived and the third-order density matrix elements were presented. Under the condition that ...

  • [1505.05606] Polarization entanglement and

    21/05/2015  Abstract: We characterize correlations in polarization and time of photon pairs generated from a cold cloud of Rb-87 atoms via a four-wave mixing process in a cascade level scheme. Quantum state tomography reveals entangled polarization states of high purity for each of the decay paths through two different intermediate hyperfine levels. When allowing both decay paths, we observe quantum beats ...

  • Quantum correlated light beams from non

    Abstract. We present experimental results showing that quantum correlated light can be produced using non-degenerate, off-resonant, four-wave mixing (4WM) on both the D1 (795 nm) and D2 (780 nm) lines of (85)Rb and (87)Rb, extending earlier work on the D1 line of (85)Rb. Using this 4WM process in a hot vapor cell to produce bright twin beams, we characterize the degree of intensity-difference ...

  • Selective generation of quantum beats of weakly

    abstract = "We report the selective generation of quantum beats of weakly confined excitons in GaAs thin films. The oscillatory structure is observed in the degenerate four-wave-mixing (DFWM) signals, and the frequency varies with excitation energy. Comparing with the DFWM spectrum, we concluded that the origin of the oscillation is the quantum beat of the weakly confined excitons. Our results ...

  • Selective generation of quantum beats of weakly

    We report the selective generation of quantum beats of weakly confined excitons in GaAs thin films. The oscillatory structure is observed in the degenerate four-wave-mixing (DFWM) signals, and the frequency varies with excitation energy. Comparing with the DFWM spectrum, we concluded that the origin of the oscillation is the quantum beat of the weakly confined excitons. Our results indicate ...

  • ABSTRACT FOR USE IN QUANTUM BEAT EXPERIMENTS

    ABSTRACT INVESTIGATION OF DOUBLE RESONANCE SPECTROSCOPY OF IODINE MOLECULES FOR USE IN QUANTUM BEAT EXPERIMENTS by Corey McDonald The resonant B3ƒ+ u ˆ X0+g and resonant E0+ g,D 02 g ˆ B3ƒ+ u ˆ X0+g transitions of I2 vapor have been studied by direct observation of °uorescence emitted from the B, E and D0 states, respectively.

  • How Quantum Mechanics Derives from a

    Quantum mechanics, by contrast, is the poor relation. The problem is that quantum mechanics has to be derived from abstract mathematical ideas that have little or no meaning in the real world.

  • Nature of nonlinear four-wave-mixing beats in ...

    Nature of nonlinear four-wave-mixing beats in semiconductors. Lyssenko VG, Erland J, ... Quantum beats of light hole and heavy hole excitons in quantum wells . Leo. Applied Physics Letters, (1) Observation of quantum beats in the resonance fluorescence of free excitons. Langer V V, Stolz H, von der Osten W . Phys. Rev. Lett., (8):854-857 MED: 10042098 Absorption quantum beats of ...

  • [1505.05606v1] Polarization entanglement and

    21/05/2015  Abstract: We characterize correlations in polarization and time of photon pairs generated from a cold cloud of Rb-87 atoms via a four-wave mixing process in a cascade level scheme. Quantum state tomography reveals entangled polarization states of high purity for each of the decay paths through two different intermediate hyperfine levels. When allowing both decay paths, we observe quantum beats ...

  • Study of Multiple Quantum Beats in Atomic

    Abstract: A theoretical model consisting of 5 energy levels in coupled four-wave mixing processes was proposed to analyze the coherent characteristics of atomic wavepackets using perturbative theory. The equations of motions of the density matrix were derived and the third-order density matrix elements were presented. Under the condition that ...

  • Quantum beats and polarization interference

    Quantum beats and polarization interference from excitons in quantum wells . By J. Feldmann. Cite . BibTex; Full citation; Abstract. We show that time-resolved quantum beat spectroscopy in the four-wave mixing (FWM) geometry is a unique tool to investigate the electronic multi-level system associated with spectrally adjacent excitonic resonances. We have studied heavy- and light-hole excitons ...

  • Quantum correlated light beams from non

    Abstract. We present experimental results showing that quantum correlated light can be produced using non-degenerate, off-resonant, four-wave mixing (4WM) on both the D1 (795 nm) and D2 (780 nm) lines of (85)Rb and (87)Rb, extending earlier work on the D1 line of (85)Rb. Using this 4WM process in a hot vapor cell to produce bright twin beams, we characterize the degree of intensity-difference ...

  • Selective Generation Of Quantum Beats Of

    We report the selective generation of quantum beats of weakly confined excitons in GaAs thin films. The oscillatory structure is observed in the degenerate four‐wave‐mixing (DFWM) signals, and the frequency varies with excitation energy. Comparing with the DFWM spectrum, we concluded that the origin of the oscillation is the quantum beat of the weakly confined excitons.

  • Heavy-hole and light-hole quantum beats in the ...

    Dual-channel spectral interferometry is used to measure the vectorial dynamics of the the four-wave-mixing signal from a GaAs-AlGaAs multiple quantum well Heavy-hole and light-hole quantum beats in the polarization state of coherent emission from quantum wells - IEEE Journals Magazine

  • Synchronous optical pumping of quantum

    Abstract. We observe quantum beats with periodic revivals due to nonlinear spacing of Zeeman levels in the ground state of potassium atoms, and demonstrate their synchronous optical pumping by double modulation of the pumping light at the Larmor frequency and the revival frequency. We show that synchronous pumping increases the degree of spin polarization by a factor of 4. As a practical ...

  • Speaker: Ying Gu Session: Plasmonics See program for ...

    Intrinsic Quantum Beats of Atomic Populations and Their Nanoscale Realization through Resonant Plasmonic Antenna, Plasmonics , DOI 10.1007/s11468-011-9272-x. [3] Ying Gu, Luojia Wang, Pan Ren, Junxiang Zhang, Tiancai Zhang, Olivier J. F. Martin, Qihuang GongÈ

  • On readout of vibrational qubits using quantum

    The quantum beats are measured by first exciting the superposition of the qubit-encoding vibrational states to the electronically excited readout state with variable time-delay pulses. The resulting oscillation of population of the readout state is then detected as a function of time delay. In principle, fitting the quantum beat signal by an analytical expression should allow extracting the ...