Optimal excitation conditions for indistinguishable photons from quantum dots

Huber, Tobias; Predojević, Ana; Föger, Daniel; Solomon, Glenn S.; Weihs, Gregor

doi:10.1088/1367-2630/17/12/123025

Cited by 42 publications

(53 citation statements)

References 43 publications

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“…14 Rather than the pure dephasing at this temperature, we attribute the dominant dephasing mechanism in our system to timing jitter in the dot emission as a result of above-band excitation. 40 Despite this dephasing, the post-selected visibility at zero time delay should still attain unity in the ideal case, but in practice our measured visibility is limited by the finite time resolution of the detectors which is on the same order as the dephasing time, as well as background emission caused by the heating laser. In summary, we demonstrated two-photon interference from independent cavity-coupled dots on the same chip.…”

mentioning

confidence: 98%

“…This interference demonstrates that we attain sufficient tuning range and precision to match individual dots separated in distance by less than 15 m, a crucial requirement for scalable quantum photonics applications. These results represent an important step towards scalable quantum integrated photonic devices composed of multiple sources for photonic quantum information processing One of the main limitations to our indistinguishability contrast is that we used non-resonant above-band excitation which can cause decoherence and large time jitter in the emitted photons 40 .…”

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confidence: 99%

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Two-Photon Interference from the Far-Field Emission of Chip-Integrated Cavity-Coupled Emitters

et al. 2016

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ABSTRACT. Interactions between solid-state quantum emitters and cavities are important for a broad range of applications in quantum communication, linear optical quantum computing, nonlinear photonics, and photonic quantum simulation. These applications often require combining many devices on a single chip with identical emission wavelengths in order to generate two-photon interference, the primary mechanism for achieving effective photon-photon interactions. Such integration remains extremely challenging due to inhomogeneous broadening and fabrication errors that randomize the resonant frequencies of both the emitters and cavities. In this letter we demonstrate two-photon interference from independent cavity-coupled emitters on the same chip, providing a potential solution to this long-standing problem. We overcome spectral mismatch between different cavities due to fabrication errors by depositing and locally evaporating a thin layer of condensed nitrogen. We integrate optical heaters to tune individual dots within each cavity to the same resonance with better than 3 µeV of precision. Combining these tuning methods, we demonstrate two-photon interference between two devices spaced by less than 15 µm on the same chip with a post-selected visibility of 33%. These results pave the way to integrate multiple quantum light sources on the same chip to develop quantum photonic devices.

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confidence: 98%

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confidence: 99%

Two-Photon Interference from the Far-Field Emission of Chip-Integrated Cavity-Coupled Emitters

et al. 2016

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“…Investigating other filtering windows, we found that including only two more time bins brings us almost back to the unfiltered value of the coalescence probability. This postselection has the same effect as a temporal shaping of the QD photons, as presented in [16,23]. In the case of our quantum dot-SPDC HOM interference, the temporal filtering discards photons that do not overlap in time, on top of removing incoherent photons from the QD luminescence.…”

Section: Hom Interferencementioning

confidence: 94%

“…In [16], we reported the indistinguishability of photons consecutively emitted by a quantum dot. The result, plotted in figure 1(b), shows an indistinguishability contrast of 0.39 (2).…”

Section: Quantum Dot Characteristicsmentioning

confidence: 99%

Interfacing a quantum dot with a spontaneous parametric down-conversion source

Huber

Prilmüller

Sehner

et al. 2017

Quantum Sci. Technol.

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Quantum networks require interfacing stationary and flying qubits. These flying qubits are usually nonclassical states of light. Here we consider two of the leading source technologies for nonclassical light, spontaneous parametric down-conversion and single semiconductor quantum dots. Downconversion delivers high-grade entangled photon pairs, whereas quantum dots excel at producing single photons. We report on an experiment that joins these two technologies and investigates the conditions under which optimal interference between these dissimilar light sources may be achieved.

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“…Two-level QD transitions can generate single photons with a high degree of indistinguishability [1][2][3][4][5][6][7][8][9][10][11][12][13], an ideal resource for implementing future quantum photonic technologies such as boson sampling [14,15] and perhaps ultimately linear optical quantum computing. Multilevel QD systems, including the biexciton → exciton → ground−state cascade and so-called spin−λ systems [16,17] can be used to generate entangled photon pairs [18][19][20][21] and spin-photon entanglement [22][23][24], respectively, which can underpin implementations of quantum repeaters and networks [25].…”

Section: Introductionmentioning

confidence: 99%

Generating indistinguishable photons from a quantum dot in a noisy environment

Santana

Malein

et al. 2017

Phys. Rev. B

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Single photons from semiconductor quantum dots are promising resources for linear optical quantum computing, or, when coupled to spin states, quantum repeaters. To realize such schemes, the photons must exhibit a high degree of indistinguishability. However, the solid-state environment presents inherent obstacles for this requirement as intrinsic semiconductor fluctuations can destroy the photon indistinguishability. Here, we demonstrate that resonant excitation of a quantum dot with a narrow-band laser generates near transform limited power spectra and indistinguishable photons from a single quantum dot in an environment with many charge-fluctuating traps. The specificity of the resonant excitation suppresses the excited state population in the quantum dot when it is detuned due to spectral fluctuations. The dynamics of this process lead to flickering of the emission over long time scales (>5 μs) and reduces the time-averaged count rates. Nevertheless, in spite of significant spectral fluctuations, high visibility two-photon interference can be achieved. This approach is useful for quantum dots with nearby surface states in processed photonic structures and quantum emitters in emerging platforms, such as two-dimensional semiconductors.

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Optimal excitation conditions for indistinguishable photons from quantum dots

Cited by 42 publications

References 43 publications

Two-Photon Interference from the Far-Field Emission of Chip-Integrated Cavity-Coupled Emitters

Two-Photon Interference from the Far-Field Emission of Chip-Integrated Cavity-Coupled Emitters

Interfacing a quantum dot with a spontaneous parametric down-conversion source

Generating indistinguishable photons from a quantum dot in a noisy environment

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