Post-Selected Indistinguishable Photons from the Resonance Fluorescence of a Single Quantum Dot in a Microcavity

Ateş, Serkan; Ulrich, S.; Reitzenstein, Stephan; Löffler, Andreas; Forchel, A.; Michler, Peter

doi:10.1103/physrevlett.103.167402

Cited by 254 publications

(261 citation statements)

References 33 publications

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“…The observation of such a low visibility under resonant excitation indicates that dephasing comes from fluctuations of the electrostatic environment around the QD. This observation is in contradiction with previous reports of high indistinguishabilities using p-shell resonant excitation 16,17 . Considering these two sets of measurements, we can conclude that under low power non-resonant excitation, non-resonantly created carriers fill deep traps around the QD and stabilize the QD electrostatic environment, enabling the observation of very high indistinguishability.…”

Section: Resultscontrasting

confidence: 99%

“…Here we study annealed InGaAs QDs, similar to the one used to produce entangled photon pairs 8 . In this case, S is below 2 meV so that Purcell effect leads to a radiative broadening of the exciton line overcoming the polarization splitting S. As a result, contrary to previous demonstrations 16,17,19 , we select any arbitrary linear polarization by inserting a polarizer before the interferometer. Finally, to reduce the effect of dephasing and obtain Fouriertransform limited photons, we take advantage of the Purcell effect to shorten the exciton lifetime 19 and investigate various excitation schemes.…”

Section: Resultsmentioning

confidence: 98%

“…9). Several works have also shown that single photons and entangled photon pairs can be made indistinguishable [16][17][18] . Shortening of the QD lifetime has been used to minimize the influence of dephasing processes and increase visibility 19,20 .…”

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confidence: 99%

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Bright solid-state sources of indistinguishable single photons

et al. 2013

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Bright sources of indistinguishable single photons are strongly needed for the scalability of quantum information processing. Semiconductor quantum dots are promising systems to build such sources. Several works demonstrated emission of indistinguishable photons while others proposed various approaches to efficiently collect them. Here we combine both properties and report on the fabrication of ultrabright sources of indistinguishable single photons, thanks to deterministic positioning of single quantum dots in well-designed pillar cavities. Brightness as high as 0.79±0.08 collected photon per pulse is demonstrated. The indistinguishability of the photons is investigated as a function of the source brightness and the excitation conditions. We show that a two-laser excitation scheme allows reducing the fluctuations of the quantum dot electrostatic environment under high pumping conditions. With this method, we obtain 82 ± 10% indistinguishability for a brightness as large as 0.65 ± 0.06 collected photon per pulse.

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Section: Resultscontrasting

confidence: 99%

Section: Resultsmentioning

confidence: 98%

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Bright solid-state sources of indistinguishable single photons

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“…More recent experiments operating on the low excitation regime have showed that the coherent scattering part of the RF could have coherence comparable to the excitation laser [4,29]. However, such a single-photon source would suffer an intrinsically low efficiency.It has been anticipated [6,[17][18][19]25] that pulsed and resonant s-shell excitation could remedy the above problems and be used for deterministic generation of timetagged, highly indistinguishable single photons. In addition, the pulsed and transition-selective RF single photons are also a prerequisite for the much sought-after goal of entangling distant QD spins through photon interference [4,30], as well as for the scheme of generating on-demand multi-photon cluster states [31].…”

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confidence: 99%

“…The Mollow triplet spectra and photon correlations of the resonance fluorescence (RF) have been measured [1][2][3]21]. Under continuous-wave (CW) laser excitation, a high degree of indistinguishability for continuously generated RF photons has been demonstrated through post-selective HOM interference [25]. However, in the CW regime, as the emission time of the RF photons is uncontrolled, the HOM interference relies on the finite single-photon detection time resolution to discriminate and post-select a small fraction of photons that overlapped on the beam-splitter at the same time [25][26][27].…”

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confidence: 99%

On-demand semiconductor single-photon source with near-unity indistinguishability

et al. 2013

Nature Nanotech

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Single photon sources based on semiconductor quantum dots offer distinct advantages for quantum information, including a scalable solid-state platform, ultrabrightness, and interconnectivity with matter qubits. A key prerequisite for their use in optical quantum computing and solid-state networks is a high level of efficiency and indistinguishability. Pulsed resonance fluorescence (RF) has been anticipated as the optimum condition for the deterministic generation of high-quality photons with vanishing effects of dephasing. Here, we generate pulsed RF single photons on demand from a single, microcavity-embedded quantum dot under s-shell excitation with 3-ps laser pulses. The π-pulse excited RF photons have less than 0.3% background contributions and a vanishing two-photon emission probability. Non-postselective Hong-Ou-Mandel interference between two successively emitted photons is observed with a visibility of 0.97(2), comparable to trapped atoms and ions. Two single photons are further used to implement a high-fidelity quantum controlled-NOT gate.Single photons have been proposed as promising quantum bits (qubits) for quantum communication [1], linear optical quantum computing [2, 3] and as messengers in quantum networks [4]. These proposals primarily rely upon a high degree of indistinguishability between individual photons to obtain the Hong-Ou-Mandel (HOM) type interference [5] which is at the heart of photonic controlled logic gates and photon-interference-mediated quantum networking [1][2][3][4].Among different types of single-photon emitters [6, 7], quantum dots (QDs) are attractive solid-state devices since they can be embedded in high-quality nanostructure cavities and waveguides to generate ultra-bright sources of single and entangled photons [7][8][9][10]. QDs also provide a light-matter interface [11][12][13] and can in principle be scaled to large quantum networks [14]. Two-photon HOM interference experiments using photons from a single QD [5,15,17], as well as from independent sources [18,19], have not only demonstrated the potential of QDs as single-photon sources, but also revealed the level of dephasing arising from incoherent excitation. The method of incoherent pumping (via above band-gap or p-shell excitation) typically causes reduced photon coherence times due to homogeneous broadening of the excited state [5] and uncontrolled emission time jitter from the nonradiative high-level to s-shell relaxation [6], leading to a decrease of photon indistinguishability.To eliminate these dephasings, an increasing effort has been devoted to s-shell resonant optical excitation of QDs. The Mollow triplet spectra and photon correlations of the resonance fluorescence (RF) have been measured [1][2][3]21]. Under continuous-wave (CW) laser excitation, a high degree of indistinguishability for continuously generated RF photons has been demonstrated through post-selective HOM interference [25]. However, in the CW regime, as the emission time of the RF photons is uncontrolled, the HOM interference relies on th...

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