Two-photon interference of the emission from electrically tunable remote quantum dots

Patel, Raj B.; Bennett, A. J.; Farrer, I.; Nicoll, C. A.; Ritchie, D. A.; Shields, A. J.

doi:10.1038/nphoton.2010.161

Cited by 320 publications

(352 citation statements)

References 27 publications

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“…A key requirement of a photonic link in a quantum network is time-synchronized indistinguishable single-photon streams. However, the uncorrelated environment fluctuations experienced by separate QDs under non-resonant excitation lead to variations in temporal and spectral overlap of photon wavepackets 31,32 . Imparting mutual coherence on independent photons via a common excitation laser can therefore be a crucial advantage in achieving indistinguishable wavepackets.…”

Section: Resultsmentioning

confidence: 99%

Phase-locked indistinguishable photons with synthesized waveforms from a solid-state source

et al. 2013

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Resonance fluorescence in the Heitler regime provides access to single photons with coherence well beyond the Fourier transform limit of the transition, and holds the promise to circumvent environment-induced dephasing common to all solid-state systems. Here we demonstrate that the coherently generated single photons from a single self-assembled InAs quantum dot display mutual coherence with the excitation laser on a timescale exceeding 3 s. Exploiting this degree of mutual coherence, we synthesize near-arbitrary coherent photon waveforms by shaping the excitation laser field. In contrast to post-emission filtering, our technique avoids both photon loss and degradation of the single-photon nature for all synthesized waveforms. By engineering pulsed waveforms of single photons, we further demonstrate that separate photons generated coherently by the same laser field are fundamentally indistinguishable, lending themselves to the creation of distant entanglement through quantum interference.

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Section: Resultsmentioning

confidence: 99%

Phase-locked indistinguishable photons with synthesized waveforms from a solid-state source

et al. 2013

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“…A natural extension is to realize non-postselective highvisibility quantum interference between two pulsed RF single photons from separate QDs [18,19]. Based on this, it is possible to entangle remote, independent QD spins [4,30].…”

Section: Discussionmentioning

confidence: 99%

“…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.…”

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confidence: 99%

“…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%

“…With the high degree of indistinguishability of the RF photons shown here, they can be used to realize various optical quantum computing algorithms [51,52], interference of multiple photons [1], and the on-demand generation of photonic cluster state from a single QD [31]. In parallel, the RF spectra of a two-level system under strong pulsed laser excitation which are expected to exhibit novel features beyond the Mollow triplet [53] is in itself a subject worth studying.A natural extension is to realize non-postselective highvisibility quantum interference between two pulsed RF single photons from separate QDs [18,19]. Based on this, it is possible to entangle remote, independent QD spins [4,30].…”

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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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Single‐Photon Sources

Inam

2019

Digital Encyclopedia of Applied Physics

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Photons' “light quantas” are considered as the central tool of the “second quantum revolution.” The “second quantum revolution” refers to the application of the discovered quantum mechanical laws toward the development of quantum information technologies that are aimed to completely outperform their classical counterparts. For practical applications, these emerging quantum technologies including all‐optical quantum information processing, communications, and metrology largely rely on the development of a novel optical tool – a bright, controllable, on‐demand source of single photons. Such a device is termed as a single‐photon source (SPS). In this article, we describe in detail the concept of a SPS and explore the various potential candidates in this regard.

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Two-photon interference of the emission from electrically tunable remote quantum dots

Cited by 320 publications

References 27 publications

Phase-locked indistinguishable photons with synthesized waveforms from a solid-state source

Phase-locked indistinguishable photons with synthesized waveforms from a solid-state source

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

Single‐Photon Sources

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