Bright Purcell Enhanced Single-Photon Source in the Telecom O-Band Based on a Quantum Dot in a Circular Bragg Grating

Kolatschek, Sascha; Nawrath, Cornelius; Bauer, Stephanie; Huang, Jian; Fischer, Julius; Sittig, Robert; Jetter, Michael; Portalupi, Simone Luca; Michler, Peter

doi:10.1021/acs.nanolett.1c02647

Cited by 52 publications

(45 citation statements)

References 48 publications

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“…However, InAs QDs in pseudomorphically strained InGaAs quantum wells [8] or grown by metalorganic vapor-phase epitaxy [9] typically suffer from high dislocation densities or large background impurity concentration, resulting in higher charge noise, blinking, or low internal quantum efficiency from non-radiative decay channels. In fact, to date, several demonstrations of single-photon emission at telecommunication wavelengths exist, [10][11][12][13][14][15][16][17][18][19][20][21] but there are only few reports on the photon indistinguishability [22][23][24] where temporal post-selection was implemented at the cost of reduced source efficiency. These works are important stepping stones toward the realization of a quantum network, and indeed prepare-and-measure Single photons in the 900-950 nm range are emitted by a quantum dot in a photonic crystal waveguide on-chip in a cryostat at 1.6 or 4 K (see main text) and routed to the frequency conversion setup via a single mode fiber.…”

Section: Introductionmentioning

confidence: 99%

A Pure and Indistinguishable Single‐Photon Source at Telecommunication Wavelength

et al. 2022

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On‐demand single‐photon sources emitting pure and indistinguishable photons at the telecommunication wavelength are critical assets toward the deployment of fiber‐based quantum networks. Indeed, single photons may serve as flying qubits, allowing communication of quantum information over long distances. Self‐assembled InAs quantum dots embedded in GaAs constitute an excellent nearly deterministic source of high‐quality single photons, but the vast majority of sources operate in the 900–950 nm wavelength range, precluding their adoption in a quantum network. A quantum frequency conversion scheme is presented here for converting single photons from quantum dots to the telecommunication C band, around 1550 nm, achieving 40.8% end‐to‐end efficiency, while maintaining both high purity and a high degree of indistinguishability during conversion with measured values of gfalse(2false)(0)=2.4%$g^{(2)}(0)=2.4\%$ and V(corr)=94.8%$V^{\mbox{(corr)}}=94.8\%$, respectively.

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Section: Introductionmentioning

confidence: 99%

A Pure and Indistinguishable Single‐Photon Source at Telecommunication Wavelength

et al. 2022

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“…We stress that the numbers presented here can be achieved with cavity and QD parameters which have been demonstrated in the literature with semiconductor microcavities [3,4,[81][82][83][84][85][86][87][88][89][90]; the range of Purcell factors shown here (less than 40; cf. a value achieved with a photonic crystal cavity of 43 [86]) can be achieved with (e.g., using dielectric micropillar resonators [3,4,[81][82][83]91]) a linewidth κ of a few hundred µeV (corresponding to Q factors ∼ 10 3 −10 4 ), and a coupling g on the order of (at most) tens of µeV, and the phonon parameter sets we use reflect measured values as discussed in Sec.…”

Section: Use Of a Cavity To Improve Device Performance Via The Purcel...mentioning

confidence: 52%

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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“…We expect these values to improve further by (i) eliminating the residual FSS and (ii) shortening of the X transition lifetime by using a cavity. 35 As a consequence of the low FSS, we obtain a concurrence of 80% for moderate binning of 512 ps, which corresponds to 30% of the accumulated correlations. Our findings also demonstrate that the time evolution of the entangled state hinders observing near-unity entanglement concurrence unless time resolution is sufficiently high.…”

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confidence: 77%

Strain-Controlled Quantum Dot Fine Structure for Entangled Photon Generation at 1550 nm

et al. 2021

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Entangled photon generation at 1550 nm in the telecom C-band is of critical importance as it enables the realization of quantum communication protocols over long distance using deployed telecommunication infrastructure. InAs epitaxial quantum dots have recently enabled on-demand generation of entangled photons in this wavelength range. However, time-dependent state evolution, caused by the fine-structure splitting, currently limits the fidelity to a specific entangled state. Here, we show fine-structure suppression for InAs quantum dots using micromachined piezoelectric actuators and demonstrate generation of highly entangled photons at 1550 nm. At the lowest fine-structure setting, we obtain a maximum fidelity of 90.0 ± 2.7% (concurrence of 87.5 ± 3.1%). The concurrence remains high also for moderate (weak) temporal filtering, with values close to 80% (50%), corresponding to 30% (80%) of collected photons, respectively. The presented fine-structure control opens the way for exploiting entangled photons from quantum dots in fiber-based quantum communication protocols.

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Bright Purcell Enhanced Single-Photon Source in the Telecom O-Band Based on a Quantum Dot in a Circular Bragg Grating

Cited by 52 publications

References 48 publications

A Pure and Indistinguishable Single‐Photon Source at Telecommunication Wavelength

A Pure and Indistinguishable Single‐Photon Source at Telecommunication Wavelength

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

Strain-Controlled Quantum Dot Fine Structure for Entangled Photon Generation at 1550 nm

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