Controlling the emission from semiconductor quantum dots using ultra-small tunable optical microcavities

Di, Ziyun; Jones, Helene V.; Dolan, Philip R.; Fairclough, Simon M.; Wincott, Matthew; Fill, Johnny; Hughes, Gordon; Smith, Jason M.

doi:10.1088/1367-2630/14/10/103048

Cited by 34 publications

(28 citation statements)

References 33 publications

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“…However, this linear-filter strategy leads to a very low efficiency. Engineering of both efficiency and indistinguishability are possible by placing the dissipative QE in an optical cavity [15,27,[32][33][34][35][36][37][38][39][40][41][42][43][44]. A usual strategy is then to use the Purcell effect to enhance the spontaneous emission, as in Eq.…”

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confidence: 99%

Cavity-Funneled Generation of Indistinguishable Single Photons from Strongly Dissipative Quantum Emitters

et al. 2015

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We investigate theoretically the generation of indistinguishable single photons from a strongly dissipative quantum system placed inside an optical cavity. The degree of indistinguishability of photons emitted by the cavity is calculated as a function of the emitter-cavity coupling strength and the cavity linewidth. For a quantum emitter subject to strong pure dephasing, our calculations reveal that an unconventional regime of high indistinguishability can be reached for moderate emittercavity coupling strengths and high quality factor cavities. In this regime, the broad spectrum of the dissipative quantum system is funneled into the narrow lineshape of the cavity. The associated efficiency is found to greatly surpass spectral filtering effects. Our findings open the path towards on-chip scalable indistinguishable-photon emitting devices operating at room temperature.Indistinguishable single photons are the building blocks of various optically-based quantum information applications such as linear optical quantum computing [1, 2], boson sampling [3][4][5][6][7], quantum teleportation [8] or quantum networks [9]. Indistinguishable photons are usually generated either using parametric down conversion [10], or alternatively directly from a single two-level quantum emitter such as atoms, color centers, quantum dots or organic molecules [11][12][13][14][15][16][17][18][19][20]. Parametric down conversion is presently the most mature technology available, but the usual low efficiency of the nonlinear processes is a severe limitation to the scalability of such sources. On the other hand, sources based on single solid-state quantum systems have been greatly developped in the last decade, as they hold the promise to combine indistinguishable, on-demand, energy-efficient, electrically drivable and scalable characteristics. However, except at cryogenics temperature, solid-state systems emitting single-photons are subject to strong pure dephasing processes [21][22][23][24][25][26][27][28][29], making them at first view inappropriate for quantum applications requiring photon indistinguishability.A two-level quantum emitter (QE) coupled only to vacuum fluctuations should emit perfectly indistinguishable photons. However, as soon as pure dephasing of the QE occurs, the degree of indistinguishability of the emitted photons is reduced to [30]where γ = 1/T 1 is the population decay rate, γ * /2 = 1/T * 2 the pure dephasing rate, and 1/T 2 = 2/T 1 + 1/T 2 * the total dephasing rate. For solid-state QE emitting photons at room temperature such as color centers, quantum dots or organic molecules, pure dephasing rates are typically several orders of magnitude larger than the population decay rate (typically ranging from 3 to 6 orders of magnitude) [12,14,21,22,24,[26][27][28][29]31]. Hence the intrinsic indistinguishability given by Eq. 1 is almost zero. A possible way to enhance the indistinguishability is to spectrally filter the emitted photons a posteriori. However, this linear-filter strategy leads to a very low efficiency. Engin...

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confidence: 99%

Cavity-Funneled Generation of Indistinguishable Single Photons from Strongly Dissipative Quantum Emitters

et al. 2015

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“…Recently however, an interest has emerged in open-access microcavities because of their facile tunability and flexibility to couple a range of electronic systems to the photonic mode [20][21][22][23][24][25][26][27]. Open cavities bring the additional advantage over micropillar structures that confinement of the optical mode can be achieved on sub-micron scales without either disrupting the integrity of the electronic system or causing scattering losses that inevitably occur with conventional etching and patterning techniques.…”

Section: Introductionmentioning

confidence: 99%

Spectral engineering of coupled open‐access microcavities

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Smith

2015

Laser & Photonics Reviews

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Open-access microcavities are emerging as a new approach to confine and engineer light at mode volumes down to the λ 3 regime. They offer direct access to a highly confined electromagnetic field while maintaining tunability of the system and flexibility for coupling to a range of matter systems. This article presents a study of coupled cavities, for which the substrates are produced using Focused Ion Beam milling. Based on experimental and theoretical investigation the engineering of the coupling between two microcavities with radius of curvature of 6 µm is demonstrated. Details are provided by studying the evolution of spectral, spatial and polarisation properties through the transition from isolated to coupled cavities. Normal mode splittings up to 20 meV are observed for total mode volumes around 10 × λ 3 . This work is of importance for future development of lab-on-a-chip sensors and photonic open-access devices ranging from polariton systems to quantum simulators.

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“…F ~ 10 5 and mode volumes as small as ~ 40 m 3 have been achieved [9]. However, serial manufacturing approaches inhibit scalability, and fully monolithic integration strategies remain elusive [15][16]. Efforts towards the construction of high-finesse…”

Section: Introductionmentioning

confidence: 99%

“…Fabry-Perot cavity arrays on a chip [10,15], particularly with individually tunable cavities [11], are at an early stage.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical characterization of on-chip buckled dome Fabry–Perot microcavities

et al. 2015

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Abstract:We report on the thermo-mechanical and thermal tuning properties of curved-mirror Fabry-Perot resonators, fabricated by the guided assembly of circular delamination buckles within a multilayer a-Si/SiO2 stack. Analytical models for temperature dependence, effective spring constants, and mechanical mode frequencies are described and shown to be in good agreement with experimental results. The cavities exhibit mode volumes as small as ~10 3 , reflectance-limited finesse ~3x10 3 , and mechanical resonance frequencies in the MHz range. Monolithic cavity arrays of this type might be of interest for applications in sensing, cavity quantum electrodynamics, and optomechanics.

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Controlling the emission from semiconductor quantum dots using ultra-small tunable optical microcavities

Cited by 34 publications

References 33 publications

Cavity-Funneled Generation of Indistinguishable Single Photons from Strongly Dissipative Quantum Emitters

Cavity-Funneled Generation of Indistinguishable Single Photons from Strongly Dissipative Quantum Emitters

Spectral engineering of coupled open‐access microcavities

Thermomechanical characterization of on-chip buckled dome Fabry–Perot microcavities

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