Fast and efficient demultiplexing of single photons from a quantum dot with resonantly enhanced electro-optic modulators

Münzberg, Julian; Draxl, Franz; Silva, Saimon Filipe Covre da; Karli, Yusuf; Manna, Santanu; Rastelli, Armando; Weihs, Gregor; Keil, Robert

doi:10.1063/5.0091867

Cited by 12 publications

(3 citation statements)

References 42 publications

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“…The results are displayed in Figure 4b. We achieve a g (2) (0) = 0.06 (1), which is a very promising result toward the goal of producing high quality single photons, considering that the experiments are performed at T = 8 K. Under s-shell resonant excitation, we observed a g (2) (0) = 0.016 30 on the same quantum dot. We find that the recorded g (2) (0) under SUPER is slightly higher than under s-shell resonant excitation due to the laser scattering background, considering that the excitation power in SUPER is much higher compared to s-shell resonant excitation.…”

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confidence: 73%

SUPER Scheme in Action: Experimental Demonstration of Red-Detuned Excitation of a Quantum Emitter

et al. 2022

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The quest for the perfect single-photon source includes finding the optimal protocol for exciting the quantum emitter. Coherent optical excitation was, up until now, achieved by tuning the laser pulses to the transition frequency of the emitter, either directly or in average. Recently, it was theoretically discovered that an excitation with two red-detuned pulses is also possible where neither of which would yield a significant upperlevel population individually. We show that the so-called swing-up of quantum emitter population (SUPER) scheme can be implemented experimentally with similar properties to existing schemes by precise amplitude shaping of a broadband pulse. Because of its truly off-resonant nature, this scheme has the prospect of powering high-purity photon sources with superior photon count rate.

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confidence: 73%

SUPER Scheme in Action: Experimental Demonstration of Red-Detuned Excitation of a Quantum Emitter

et al. 2022

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“…Theoretically, we have shown 10 consecutive photon streams with a production efficiency of up to around 2% and 20% respectively for coherent and incoherent re-preparation methods, as well as expected 10 photon counts rates on order of kHz which represents a significant improvement from any previous atom cavity scheme. This is essential for demonstrating multi-photon coincidences with high clockrates [42] for boson sampling [43] or other quantum information processing applications. Moreover, preserving coherence of the emitter throughout the entire process is another extremely appealing feature.…”

Section: Discussionmentioning

confidence: 99%

Bursts of polarised single photons from atom-cavity sources

Ernst,

Alvarez,

Barrett

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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Photonic qubits play an instrumental role in the development of advanced quantum technologies, including quantum networking, boson sampling and measurement based quantum computing. A promising framework for the deterministic production of indistinguishable single photons is an atomic emitter coupled to a single mode of a high finesse optical cavity. Polarisation control is an important cornerstone, particularly when the polarisation defines the state of a quantum bit. Here, we propose a scheme for producing bursts of polarised single photons by coupling a generalised atomic emitter to an optical cavity, exploiting a particular choice of quantisation axis. In connection with two re-preparation methods, simulations predict 10-photon bursts coincidence count rates on the order of 1 kHz with single 87Rb atoms trapped in a state of the art optical cavity. This paves the way for novel n-photon experiments with atom-cavity sources.

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“…the first BS of the MZI, with deterministic choice of the path for the consecutive photons, sending deterministically the head (tail) photon in the longer (shorter) path. This active demultiplexing can be realized, for example, by adopting an electro-optic modulator and a polarizing BS (PBS) [45]. As explained previously, the quality of the produced state is evaluated in terms of g (2) (0) and the indistinguishability of consecutive photons.…”

Section: Performancesmentioning

confidence: 99%

Generation and characterization of polarization-entangled states using quantum dot single-photon sources

Valeri,

Barigelli,

Polacchi

et al. 2024

Quantum Sci. Technol.

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Single-photon sources based on semiconductor quantum dots find several applications in quantum information processing due to their high single-photon indistinguishability, on-demand generation, and low multiphoton emission. In this context, the generation of entangled photons represents a challenging task with a possible solution relying on the interference in probabilistic gates of identical photons emitted at different pulses fromthe same source. In this work, we implement this approach via a simple and compact design that generates entangled photon pairs in the polarization degree of freedom. We operate the proposed platform with single photons produced through two different pumping schemes, the resonant excited one and the longitudinal-acoustic phonon-assisted configuration. We then characterize the produced entangled two-photon states by developing a complete model taking into account relevant experimental parameters, such as the second-order correlation function, Hong-Ou-Mandel visibility, multiphoton emission and pump laser filtering. Our source shows long-term stability and high quality of the generated entangled states, thus constituting a reliable building block for optical quantum technologies.

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Fast and efficient demultiplexing of single photons from a quantum dot with resonantly enhanced electro-optic modulators

Cited by 12 publications

References 42 publications

SUPER Scheme in Action: Experimental Demonstration of Red-Detuned Excitation of a Quantum Emitter

SUPER Scheme in Action: Experimental Demonstration of Red-Detuned Excitation of a Quantum Emitter

Bursts of polarised single photons from atom-cavity sources

Generation and characterization of polarization-entangled states using quantum dot single-photon sources

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