High-performance semiconductor quantum-dot single-photon sources

Senellart, P.; Solomon, Glenn S.; White, A. G.

doi:10.1038/nnano.2017.218

Cited by 968 publications

(963 citation statements)

References 187 publications

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“…However, in the past few years, researchers have demonstrated almost perfectly indistinguishable photons from a resonantly excited QD [9], control over the spectrum of resonantly scattered light [10,11], and the filtering of the phonon sideband and improvement of photon coherence through the use of micropillar cavities [12,13].…”

Section: Introductionmentioning

confidence: 99%

Controllable Photonic Time-Bin Qubits from a Quantum Dot

et al. 2018

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Photonic time-bin qubits are well suited to transmission via optical fibers and waveguide circuits. The states take the form 1 ffiffiffiffi ffi ð2Þ p ðαj0i þ e iϕ βj1iÞ, with j0i and j1i referring to the early and late time bin, respectively. By controlling the phase of a laser driving a spin-flip Raman transition in a single-holecharged InAs quantum dot, we demonstrate complete control over the phase, ϕ. We show that this photon generation process can be performed deterministically, with only a moderate loss in coherence. Finally, we encode different qubits in different energies of the Raman scattered light, paving the way for wavelengthdivision multiplexing at the single-photon level.

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Section: Introductionmentioning

confidence: 99%

Controllable Photonic Time-Bin Qubits from a Quantum Dot

et al. 2018

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“…Single photon sources are a crucial ingredient for various photonic quantum technologies ranging from quantum key distribution to optical quantum computing. Such sources are characterized by a vanishing second-order autocorrelation g ð2Þ ð0Þ ≈ 0 [3]. In the strong coupling regime, where the coupling between the two-level system and the cavity is larger than the cavity decay rate ðg > κÞ [4], photon blockade has been demonstrated in atomic systems [5], quantum dots in photonic crystal cavities [6], and circuit QED [7,8].…”

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confidence: 99%

Observation of the Unconventional Photon Blockade

et al. 2018

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We observe the unconventional photon blockade effect in quantum dot cavity QED, which, in contrast to the conventional photon blockade, operates in the weak coupling regime. A single quantum dot transition is simultaneously coupled to two orthogonally polarized optical cavity modes, and by careful tuning of the input and output state of polarization, the unconventional photon blockade effect is observed. We find a minimum second-order correlation g ð2Þ ð0Þ ≈ 0.37, which corresponds to g ð2Þ ð0Þ ≈ 0.005 when corrected for detector jitter, and observe the expected polarization dependency and photon bunching and antibunching; close by in parameter space, which indicates the abrupt change from phase to amplitude squeezing. DOI: 10.1103/PhysRevLett.121.043601 A two-level system strongly coupled to a cavity results in polaritonic dressed states with a photon-number dependent energy. This dressing gives rise to the photon blockade effect [1,2] resulting in photon-number dependent transmission and reflection, enabling the transformation of incident coherent light into specific photon number states such as single photons. Single photon sources are a crucial ingredient for various photonic quantum technologies ranging from quantum key distribution to optical quantum computing. Such sources are characterized by a vanishing second-order autocorrelation g ð2Þ ð0Þ ≈ 0 [3]. In the strong coupling regime, where the coupling between the two-level system and the cavity is larger than the cavity decay rate ðg > κÞ [4], photon blockade has been demonstrated in atomic systems [5], quantum dots in photonic crystal cavities [6], and circuit QED [7,8]. At the onset of the weak coupling regime (g ≈ κ), it has been shown that by detuning the dipole transition frequency with respect to the cavity resonance, photon blockade can still be observed [9]. However, moving further into the weak coupling regime (g < κ), which is much easier to achieve [10,11] (in particular if one aims for a small polarization mode splitting), the conventional photon blockade is no longer possible because the energy gap between the polariton states vanishes. Nevertheless, also in the weak coupling regime, the two-level system enables photon number sensitivity, which has recently enabled high-quality single photon sources using polarization postselection [12][13][14] or optimized cavity in-coupling [15,16].In 2010, Liew and Savona introduced the concept of the unconventional photon blockade (UPB) [17,18]

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“…Beyond diamond, defect centers in other materials such as silicon carbide [51], gallium nitride [52], or rare-earth ions in solids [53,54] could hold promise, as well as artificial atoms like quantum dots [55][56][57], all of which exhibit appreciable distributions of resonance frequencies.…”

Section: Future Directionsmentioning

confidence: 99%

Super-Resolution Localization and Readout of Individual Solid State Qubits

Bersin

Walsh

Mouradian

et al. 2018

Conference on Lasers and Electro-Optics

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A central goal in quantum information science is to establish entanglement across multiple quantum memories in a manner that allows individual control and readout of each constituent qubit. In the area of solid state quantum optics, a leading system is the negatively charged nitrogen vacancy center in diamond, which allows access to a spin center that can be entangled to multiple nuclear spins. Scaling these systems will require the entanglement of multiple NV centers, together with their nuclear spins, in a manner that allows for individual control and readout. Here we demonstrate a technique that allows us to prepare and measure individual centers within an ensemble, well below the diffraction limit. The technique relies on optical addressing of spin-dependent transitions, and makes use of the built-in inhomogeneous distribution of emitters resulting from strain splitting to measure individual spins in a manner that is non-destructive to the quantum state of other nearby centers. We demonstrate the ability to resolve individual NV centers with subnanometer spatial resolution. Furthermore, we demonstrate crosstalk-free individual readout of spin populations within a diffraction limited spot by performing resonant readout of one NV during a spectroscopic sequence of another. This method opens the door to multi-qubit coupled spin systems in solids, with individual spin manipulation and readout.

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High-performance semiconductor quantum-dot single-photon sources

Cited by 968 publications

References 187 publications

Controllable Photonic Time-Bin Qubits from a Quantum Dot

Controllable Photonic Time-Bin Qubits from a Quantum Dot

Observation of the Unconventional Photon Blockade

Super-Resolution Localization and Readout of Individual Solid State Qubits

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