Optically Tunable Spontaneous Raman Fluorescence from a Single Self-Assembled InGaAs Quantum Dot

Fernandez, G.; Volz, Thomas; Desbuquois, Rémi; Badolato, Antonio; İmamoğlu, Ataç

doi:10.1103/physrevlett.103.087406

Cited by 45 publications

(40 citation statements)

References 27 publications

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“…The creation of Raman photons along a non-driven transition has been also experimentally addressed in QDs, either in free space [48,49] or coupled to a cavity [50,51]. This process has been proposed as a tunable source for a probabilistic entanglement scheme, a property of paramount interest to quantum information processing [48]. Quantum interference between two cw Raman photons as high as 0.98 has also been reported [49].…”

Section: Discussionmentioning

confidence: 99%

“…One advantage of the current hybrid system relies in the fact that the RF photons are produced along the undriven transition, which lacks of the elastic component, while the RF photons produced along the on-resonance driven transition can be removed by using a polarization selective detection scheme. The creation of Raman photons along a non-driven transition has been also experimentally addressed in QDs, either in free space [48,49] or coupled to a cavity [50,51]. This process has been proposed as a tunable source for a probabilistic entanglement scheme, a property of paramount interest to quantum information processing [48].…”

Section: Discussionmentioning

confidence: 99%

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Resonance fluorescence spectrum of aΛ-type quantum emitter close to a metallic nanoparticle

et al. 2016

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We theoretically study the resonance fluorescence spectrum of a three-level quantum emitter coupled to a spherical metallic nanoparticle. We consider the case that the quantum emitter is driven by a single laser field along one of the optical transitions. We show that the development of the spectrum depends on the relative orientation of the dipole moments of the optical transitions in relation to the metal nanoparticle. In addition, we demonstrate that the location and width of the peaks in the spectrum are strongly modified by the exciton-plasmon coupling and the laser detuning, allowing to achieve controlled strongly subnatural spectral line. A strong antibunching of the fluorescent photons along the undriven transition is also obtained. Our results may be used for creating a tunable source of photons which could be used for a probabilistic entanglement scheme in the field of quantum information processing.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Resonance fluorescence spectrum of aΛ-type quantum emitter close to a metallic nanoparticle

et al. 2016

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“…This approach can further be used to control the timing and the shape of the single-photon pulses (30). Unlike previous demonstrations of Raman tuning of solid-state quantum emitters (31)(32)(33), the tuning range demonstrated here (20) is comparable to the inhomogeneous distribution of the SiV ensemble and can thus be used to tune pairs of SiV centers into resonance. Entanglement of SiV centers in a diamond nanophotonic waveguide.…”

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confidence: 88%

An integrated diamond nanophotonics platform for quantum-optical networks

Sipahigil

Evans

Sukachev

et al. 2016

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Efficient interfaces between photons and quantum emitters form the basis for quantum networks and enable nonlinear optical devices operating at the single-photon level. We demonstrate an integrated platform for scalable quantum nanophotonics based on silicon-vacancy (SiV) color centers coupled to nanoscale diamond devices. By placing SiV centers inside diamond photonic crystal cavities, we realize a quantum-optical switch controlled by a single color center. We control the switch using SiV metastable orbital states and verify optical switching at the single-photon level by using photon correlation measurements. We use Raman transitions to realize a single-photon source with a tunable frequency and bandwidth in a diamond waveguide. Finally, 1 arXiv:1608.05147v1 [quant-ph]

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“…In this Letter, we implement an alternative method to determine the spin coherence time of a quantum emitter that is to a large extent immune to the limitations that influence Ramsey interferometry. The principal idea behind our work is the fact that first-order coherence of spin-flip Raman scattering is determined by the coherence properties of the excitation laser field and the spin coherence [9]. Therefore, measuring the coherence time of Raman scattered photons upon excitation with a monochromatic laser field is equivalent to a measurement of the spin dephasing time.…”

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confidence: 99%

Measurement of spin coherence using Raman scattering

et al. 2016

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Ramsey interferometry provides a natural way to determine the coherence time of most qubit systems. Recent experiments on quantum dots however, demonstrated that dynamical nuclear spin polarization can strongly influence the measurement process, making it difficult to extract the T * 2 coherence time using optical Ramsey pulses. Here, we demonstrate an alternative method for spin coherence measurement that is based on first-order coherence of photons generated in spin-flip Raman scattering. We show that if a quantum emitter is driven by a weak monochromatic laser, Raman coherence is determined exclusively by spin coherence, allowing for a direct determination of spin T * 2 time. When combined with coherence measurements on Rayleigh scattered photons, our technique enables us to identify coherent and incoherent contributions to resonance fluorescence, and to minimize the latter. We verify the validity of our technique by comparing our results to those determined from Ramsey interferometry for electron and heavy-hole spins.PACS numbers: 03.67. Lx, 73.21.La, A single electron or hole spin confined in a InGaAs self-assembled quantum dot (QD) is a promising candidate for realization of quantum information processing protocols that rely on an efficient spin-photon interface. [1][2][3]. For all of the proposed applications, understanding the nature of QD spin coherence using Ramsey and dynamical decoupling techniques is essential [4, 5]. Remarkably, Ramsey interferometry implemented using optical rotation pulses in QDs is strongly influenced by dynamical nuclear spin polarization effects [6][7][8]. In fact, Ramsey experiment on an electron spin shows a few nonsinusoidal oscillations before the signal vanishes completely on time scales that are a factor of ∼ 4 shorter than the expected T * 2 time. In this Letter, we implement an alternative method to determine the spin coherence time of a quantum emitter that is to a large extent immune to the limitations that influence Ramsey interferometry. The principal idea behind our work is the fact that first-order coherence of spin-flip Raman scattering is determined by the coherence properties of the excitation laser field and the spin coherence [9]. Therefore, measuring the coherence time of Raman scattered photons upon excitation with a monochromatic laser field is equivalent to a measurement of the spin dephasing time. As we show below, it is essential to carry out Raman coherence measurements at low excitation limit well below the saturation intensity in order to ensure that spin dephasing induced by Rayleigh scattering remains weak as compared to the inherent T * 2 time. Moreover, dynamical nuclear spin polarization is strongly suppressed in this regime, allowing us to observe the expected Gaussian decay of the interference signal. The experiments are based on single InGaAs QDs grown epitaxially in a p-i-n structure. The QD layer is separated by a 35 nm tunneling barrier from the n+ back contact and 40 nm AlGaAs blocking barrier from the top p+ contact. The p-i-n structure...

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Optically Tunable Spontaneous Raman Fluorescence from a Single Self-Assembled InGaAs Quantum Dot

Cited by 45 publications

References 27 publications

Resonance fluorescence spectrum of aΛ-type quantum emitter close to a metallic nanoparticle

Resonance fluorescence spectrum of aΛ-type quantum emitter close to a metallic nanoparticle

An integrated diamond nanophotonics platform for quantum-optical networks

Measurement of spin coherence using Raman scattering

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