Superfluorescence spectra of excitons in quantum wells

Grünwald, P.; Burau, G. K. G.; Stolz, H.; Vogel, W.

doi:10.1103/physrevb.88.195308

Cited by 4 publications

(10 citation statements)

References 40 publications

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“…The quantitative description of absorption and emission processes in semiconductors generally requires both the medium properties as well as a quantum-optical description of the emitters, here the excitons. For example, the fluorescent emission of a coherently pumped quantum well required the combination of both the absorption (not to be confused with the absorption spectrum) as well as the spectral intensity distribution of the excitons [17,18]. In that case, the necessity to combine both processes follows from Kirchhoff's law [19] and from the quantum-optical input-output relations [20].…”

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confidence: 99%

Signatures of Quantum Coherences in Rydberg Excitons

et al. 2016

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Coherent optical control of individual particles has been demonstrated both for atoms and semiconductor quantum dots. Here we demonstrate the emergence of quantum coherent effects in semiconductor Rydberg excitons in bulk Cu2O. Due to the spectral proximity between two adjacent Rydberg exciton states, a singlefrequency laser may pump both resonances with little dissipation from the detuning. As a consequence, additional resonances appear in the absorption spectrum that correspond to dressed states consisting of two Rydberg exciton levels coupled to the excitonic vacuum, forming a V-type three-level system, but driven only by one laser light source. We show that the level of pure dephasing in this system is extremely low. These observations are a crucial step towards coherently controlled quantum technologies in a bulk semiconductor.

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confidence: 99%

Signatures of Quantum Coherences in Rydberg Excitons

et al. 2016

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“…The dressed states

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is a quantum pure state which reminds us of the work by W. Vogel et al . that the optimal squeezing in resonance fluorescence of the atom‐cavity system is achieved when the electronic subsystem of the atoms is in a pure quantum state. However, without tunneling barrier to transport the electron from the left dot to right one, it is hard to trap the electron in a stable eigenstate of the system which only consists of a single dot even with three electron orbital states.…”

Section: Resultsmentioning

confidence: 99%

Quadrature squeezing of a mechanical resonator generated by the electromechanical coupling with two coupled quantum dots

et al. 2014

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The quadrature squeezing of a mechanical resonator (MR) coupled with two quantum dots (QDs) through the electromechanical coupling, where the QDs are driven by a strong and two weak laser fields is investigated. By tuning the gate voltage, the electron can be trapped in a quantum pure state. Under certain conditions, the discrepancies between the transition frequency and that of two weak fields are compensated by the phonons induced by the electromechanical coupling of the MR with QDs. In this case, some dissipative processes occur resonantly. The phonons created and (or) annihilated in these dissipative processes are correlated thus leading to the quadrature squeezing of the MR. A squeezed vacuum reservoir for the MR is built up. By tuning the gate voltage to control the energy structure of the QDs, the present squeezing scheme has strong resistance against the dephasing processes of the QDs in low temperature limit. The role of the temperature of the phonon reservoir is to damage squeezing of the MR.

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“…The quantum-well structure studied in [9] will be briefly reconsidered here. A GaAs quantum well inside a multiwell stack was quasi-resonantly excited with a cw-laser of frequency ω L .…”

Section: Spectral Absorptionmentioning

confidence: 99%

“…In general, it is not obvious, how particular quantum effects are affected by an absorptive environment. Recently, we explained the structures of fluorescence spectra [9] observed from excitons in a semiconductor quantum well structure [10,11]. Such systems are an interesting playground for studying effects of absorption on the quantum properties of light.…”

Section: Introductionmentioning

confidence: 99%

Enhanced squeezing by absorption

Grünwald¹,

Vogel²

2016

Phys. Scr.

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Abstract. Absorption is usually expected to be detrimental to quantum coherence effects. However, the situation for complex absorption spectra has been little studied yet. We consider the resonance fluorescence of excitons in a semiconductor quantum well. The creation of excitons requires absorption of the incoming pump-laser light. Thus, the absorption spectrum of the medium acts as a spectral filter for the emitted light. Surprizingly, absorption can even improve quantum effects, as is demonstrated for the squeezing of the resonance fluorescence of the quantum-well system. This effect can be explained by an improved phase matching due to absorption.

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Superfluorescence spectra of excitons in quantum wells

Cited by 4 publications

References 40 publications

Signatures of Quantum Coherences in Rydberg Excitons

Signatures of Quantum Coherences in Rydberg Excitons

Quadrature squeezing of a mechanical resonator generated by the electromechanical coupling with two coupled quantum dots

Enhanced squeezing by absorption

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