Coherent coupling of individual quantum dots measured with phase-referenced two-dimensional spectroscopy: Photon echo versus double quantum coherence

Delmonte, Valentin; Specht, Judith; Jakubczyk, Tomasz; Höfling, Sven; Kamp, M.; Schneider, Christian; Langbein, Wolfgang Werner; Nogues, Gilles; Richter, Marten; Kasprzak, Jacek

doi:10.1103/physrevb.96.041124

Cited by 18 publications

(15 citation statements)

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“…Because interfacial and self‐assembled quantum dot ensembles grow randomly, this coupling gets washed out in ensemble measurements even as the homogeneous linewidth is preserved. Coupling has been observed and characterized, however, using frequency‐based MDCS in which excitation beams are arranged to impinge upon the sample in collinear geometry …”

Section: Quantum Dotsmentioning

confidence: 99%

“…used the hyperspectral imaging technique to identify biexcitons and inter‐dot coupling effects using an MDCS rephasing pulse sequence, and Delmonte et al. have followed up on this experiment with a study comparing rephasing and two‐quantum MDCS pulse sequences . An example of the kinds of observable coupling signatures is displayed in Figure .…”

Section: Quantum Dotsmentioning

confidence: 99%

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Multidimensional Coherent Spectroscopy of Semiconductors

Smallwood

Cundiff

2018

Laser & Photonics Reviews

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Optical multidimensional coherent spectroscopy (MDCS) is a nonlinear spectroscopy technique where a material is excited by a series of laser pulses to produce a spectrum as a function of multiple frequencies. The technique's ability to elucidate excited‐state structure and interactions has made MDCS a valuable tool in the study of excitons in semiconductors. This review introduces the method and describes progress it has fostered establishing a better understanding of dephasing rates, coherent coupling mechanisms, and many‐body interactions pertaining to optically generated electronic excitations in a variety of semiconductor material systems. Emphasis is placed on nanostructured gallium arsenide quantum wells and quantum dots, on quantum dots in other III–V and II–VI semiconductors, and on atomically thin transition metal dichalcogenides. Recent technical advances and potential future directions in the field are also discussed.

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Section: Quantum Dotsmentioning

confidence: 99%

Section: Quantum Dotsmentioning

confidence: 99%

Multidimensional Coherent Spectroscopy of Semiconductors

Smallwood

Cundiff

2018

Laser & Photonics Reviews

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“…It has been used to detect coherent coupling [83], the quantum strong coupling between a single emitter and a cavity [84], and cavity induced coherent coupling between single emitters [85]. More recently, improved phase referencing was used [86] to identify coherent coupling between single emitters via different coherent pathways.…”

Section: Statusmentioning

confidence: 99%

Roadmap on bio-nano-photonics

Herkert

Slesiona

Recchia

et al. 2021

J. Opt.

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In the quest to decipher the chain of life from molecules to cells, the biological and biophysical questions being asked increasingly demand techniques that are capable of identifying specific biomolecules in their native environment, and can measure biomolecular interactions quantitatively, at the smallest possible scale in space and time, without perturbing the system under observation. The interaction of light with biomolecules offers a wealth of phenomena and tools that can be exploited to drive this progress. This Roadmap is written collectively by prominent researchers and encompasses selected aspects of bio-nano-photonics, spanning from

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“…These weak off-diagonal signals most likely result from radiative in-teraction between adjacent quantum dot states, which has been shown to have a long range exceeding 400 nm [2]. Though weak, we measure interactions between few resonantly excited QDs over the sample, and weak interactions between resolved QD states have very recently been measured in self-assembled QDs [27].…”

mentioning

confidence: 95%

“…With resonant excitation of only the QD states, these signals can result from three interactions. A double-quantum signal resulting from 1) biexcitons in non-interacting self-assembled QDs has been measured [27], but excitation of these signals requires enough bandwidth to excite both the exciton and biexciton. Our sample has been well characterized using MDCS, and it is known that the biexciton binding energy of an ensemble of these dots increases with emission energy from 3.3 to 3.8 meV, and it has a distribution about that center , which corresponds to a many-body interaction that has been turned on between those resonances.…”

mentioning

confidence: 99%

Inducing coherent quantum dot interactions

Martin

Cundiff

2018

Phys. Rev. B

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We measure many-body interactions in isolated quantum dot states using double-quantum multidimensional coherent spectroscopy. Few states are probed in a diffraction limited spot, which is enabled by a novel collinear scheme in which radiated four-wave-mixing signals are measured with phase resolution. Many-body interactions are enhanced by an additional prepulse tuned to the delocalized quasi-continuum states. We propose this effect as a method for controlling coupling between quantum states. PACS numbers: 78.67.Hc, 78.47.nj Quantum dots (QDs) are often described as being noninteracting artificial atoms. Some optical spectroscopic experiments have been used to conclude that there are no measurable many-body interactions present for resonant excitation of interfacial ODs, which would support treating these QDs as non-interacting [1]. However, other optical techniques have yielded signatures of interactions between these QDs [2][3][4]. Outside of the spectroscopic differences, discrepancies exist regarding the presence of many-body effects in QD lasers [5]. The benefits of QD lasers arise from the discrete and narrow energy levels of QDs, but they are usually pumped by the injection of delocalized carriers [6]. Since many-body effects play a tremendous role in the theoretical treatment of semiconductors [7], it is important to understand the relevant interactions for calculating QD laser properties.Excitons and trions confined to QDs are potential candidates for qubits in quantum information [8][9][10]. The electronic states of a QD are accessible both optically and electronically. Also, the high oscillator strengths of electronic transitions in solid state systems facilitate their measurement and manipulation. Coherent control with ultrafast Rabi rotations has been demonstrated on both single and ensemble QD systems [11,12]. However, controlled qubit interaction remains one of the most challenging requirements for a functional quantum computer with few implementations for spin states in QDs [13,14] and none for the electronic states. The localization of excitons in QDs that gives them the benefit of being difficult to decohere also makes them difficult to entangle, or couple [15].Here we observe that the excitation of delocalized states not only enhances many-body effects, in agreement with theory [16], but can also turn them on. The physical mechanism responsible for enhancing many-body interactions in QDs may explain discrepancies in the literature. The mechanism may also be applied for turning on electronic coupling between isolated QD states.We use ultrafast coherent spectroscopy techniques to directly probe coupling and many-body interactions in a sub-micron-sized region containing a small number of distinct epitaxially-grown GaAs interfacial QDs at a temperature of 6 K. These interfacial QDs are exciton states bound by monolayer fluctuations in a narrow 4.2 nm GaAs quantum well with Al 0.3 Ga 0.7 As barriers [17]. The decreased transverse confinement binds the localized excitons by 10 meV, which energetic...

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Coherent coupling of individual quantum dots measured with phase-referenced two-dimensional spectroscopy: Photon echo versus double quantum coherence

Abstract: International audienc

Cited by 18 publications

References 42 publications

Multidimensional Coherent Spectroscopy of Semiconductors

Multidimensional Coherent Spectroscopy of Semiconductors

Roadmap on bio-nano-photonics

Inducing coherent quantum dot interactions

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