High-resolution spectroscopy of a quantum dot driven bichromatically by two strong coherent fields

Gustin, Chris; Hanschke, Lukas; Boos, Katarina; Muller, Jonathan; Kremser, Malte; Finley, Jonathan J.; Hughes, Stephen; Müller, Kai

doi:10.1103/physrevresearch.3.013044

Cited by 11 publications

(5 citation statements)

References 61 publications

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“…Throughout our calculations, we shall use for our calculations two different sets of phonon parameters, denoted I and II, such that α I = 0.04 ps 2 , and ω b,I = 0.9 meV, while α II = 0.006 ps 2 , and ω b,II = 5.5 meV. For the most part (a notable exception being the calculation of the cw error rate), set I corresponds to a "stronger" phonon coupling strength, and is similar to what has been extracted from measurements with InAs/GaAs QDs [45][46][47][54][55][56], while set II gives a (in most cases) weaker phonon coupling strength, and is more similar to numbers consistent with experimental results in some waveguide structures [57], including our own [27]. For our study of the source purity, we also use a set III with intermediate values α III = 0.025 ps 2 and ω b,III = 2.5 meV.…”

Section: Exciton-phonon Coupling and The Polaron Master Equationsupporting

confidence: 68%

Using the Autler-Townes and ac Stark effects to optically tune the frequency of indistinguishable single-photons from an on-demand source

Gustin,

Dusanowski,

Höfling

et al. 2022

Preprint

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We describe how a coherent optical drive that is near-resonant with the upper rungs of a three-level ladder system, in conjunction with a short pulse excitation, can be used to provide a frequencytunable source of on-demand single photons. Using an intuitive master equation model, we identify two distinct regimes of device operation: (i) for a resonant drive, the source operates using the Autler-Townes effect, and (ii) for an off-resonant drive, the source exploits the ac Stark effect. The former regime allows for a large frequency tuning range but coherence suffers from timing jitter effects, while the latter allows for high indistinguishability and efficiency, but with a restricted tuning bandwidth due to high required drive strengths and detunings. We show how both these negative effects can be mitigated by using an optical cavity to increase the collection rate of the desired photons. We apply our general theory to semiconductor quantum dots, which have proven to be excellent single-photon sources, and find that scattering of acoustic phonons leads to excitationinduced dephasing and increased population of the higher energy level which limits the bandwidth of frequency tuning achievable while retaining high indistinguishability. Despite this, for realistic cavity and quantum dot parameters, indistinguishabilities of over 90% are achievable for energy shifts of up to hundreds of µeV, and near-unity indistinguishabilities for energy shifts up to tens of µeV. Additionally, we clarify the often-overlooked differences between an idealized Hong-Ou-Mandel twophoton interference experiment and its usual implementation with an unbalanced Mach-Zehnder interferometer, pointing out the subtle differences in the single-photon visibility associated with these different setups.

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Section: Exciton-phonon Coupling and The Polaron Master Equationsupporting

confidence: 68%

Using the Autler-Townes and ac Stark effects to optically tune the frequency of indistinguishable single-photons from an on-demand source

Gustin,

Dusanowski,

Höfling

et al. 2022

Preprint

Self Cite

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“…[ 4,5,35,36 ] Driving with two laser pulses, the peaks split up even further resulting in a complex optical spectrum. [ 37 ] The resonance fluorescence signal is typically evaluated using the quantum regression theorem. [ 38 ]…”

Section: Introductionmentioning

confidence: 99%

Optical Signals to Monitor the Dynamics of Phonon‐Modified Rabi Oscillations in a Quantum Dot

Klaßen

Reiter

2021

Annalen der Physik

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Semiconductor quantum dots are solid state few‐level systems which can interact strongly with light. As such, they can be used as a single photon source or to perform solid‐state quantum‐optics experiments. A major difference to atoms is the interaction with the lattice vibrations, that is, the phonons, which strongly affect the optical signals from a quantum dot. In this paper, we calculate the time‐resolved pump‐probe signals from a continuously driven quantum dot accounting for detuned excitation and electron–phonon interaction. We provide analytical equations giving insight into the different phenomena observed in the spectra like an oscillation between absorptive and dispersive line shapes. For detuned excitation, the electron–phonon interaction can lead to phonon‐assisted occupation of the exciton, giving rise to a strong asymmetry in the dynamical behavior depending on the sign of the detuning. The time‐resolved spectra monitor this relaxation path, which helps understanding the effect of electron–phonon interaction in quantum dots.

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“…The coherent interaction between a two‐level system and a bichromatic field is an ever‐green problem and has attracted considerable attentions, [ 27–34 ] ranging from dynamics to fluorescence. There are rich multiphoton resonant processes such as, the two‐level system absorbs

n+1

photons from one component of the bichromatic field and emits

n

photons of the other component with

n

being a positive integer, which have been revealed by a number of theoretical studies based on the Green's function, [ 27 ] generalized Floquet theory (GFT), [ 28 ] and RWA.…”

Section: Introductionmentioning

confidence: 99%

“…As is wellknown, in the Rabi model which describes a two-level system (qubit) driven by a monochromatic field, the counter-rotating coupling is found to cause multiphoton quantum resonances [2,22] and the Bloch-Siegert shift which describes that the resonance frequency varies with the driving strength. [1,2,[23][24][25][26] The coherent interaction between a twolevel system and a bichromatic field is an ever-green problem and has attracted considerable attentions, [27][28][29][30][31][32][33][34] ranging from dynamics to fluorescence. There are rich multiphoton resonant processes such as, the two-level system absorbs n + 1 photons from one component of the bichromatic field and emits n photons of the other component with n being a positive integer, which have been revealed by a number of theoretical studies based on the Green's function, [27] generalized Floquet theory (GFT), [28] and RWA.…”

Section: Introductionmentioning

confidence: 99%

Multiphoton Resonance Band and Bloch–Siegert Shift in a Bichromatically Driven Qubit

et al. 2023

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The resonance and dynamics of a qubit exposed to a strong aperiodic bichromatic field are studied by using a periodic counter‐rotating hybridized rotating wave (CHRW) Hamiltonian, which is derived from the original Hamiltonian with the unitary transformations under a reasonable approximation and enables the application of the Floquet theory. It is found that the consistency between the CHRW results and numerically exact generalized‐Floquet‐theory (GFT) results in the valid regime of the former while the widely used rotating‐wave approximation breaks down. It is illustrated that the resonance exhibits band structure and the Bloch–Siegert shifts induced by the counter‐rotating couplings of the bichromatic field become notable at the multiphoton resonance band. In addition, the CHRW method is found to have a great advantage of efficiency over the GFT approach particularly in the low beat‐frequency case where the latter converges very slowly. The present CHRW method provides a highly efficient way to calculate the resonance frequency incorporating the Bloch–Siegert shift and provides insights into the effects of the counter‐rotating couplings of the bichromatic field in the strong‐driving regimes.

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High-resolution spectroscopy of a quantum dot driven bichromatically by two strong coherent fields

Cited by 11 publications

References 61 publications

Using the Autler-Townes and ac Stark effects to optically tune the frequency of indistinguishable single-photons from an on-demand source

Using the Autler-Townes and ac Stark effects to optically tune the frequency of indistinguishable single-photons from an on-demand source

Optical Signals to Monitor the Dynamics of Phonon‐Modified Rabi Oscillations in a Quantum Dot

Multiphoton Resonance Band and Bloch–Siegert Shift in a Bichromatically Driven Qubit

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