Generation of quantum light with tunable Wigner negativity with a semiconductor quantum dot

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1. Very close Another approach to the problem Not relevant

   Pulsed coherent and squeezed driving of a spin-$S$ emitter as a deterministic source of Wigner-negative light

   R. Robertson, S. Parkins · 2026 · Not summarized yet

   The study simulates pulsed coherent or squeezed driving of a spin emitter to deterministically generate Wigner-negative light, rather than using a quantum-dot cavity experiment.

   Abstract

   Generating propagating Wigner-negative states of light is an important and difficult task for many quantum technologies. Historically, the proposed methods of creating such states have been intrinsically probabilistic, relying on conditional measurements or photon heralding. More recently, methods have been proposed involving the steady-state driving of two-level emitters, where Wigner-negative temporal modes are present in the outgoing field. We theoretically demonstrate through the simulation of a cascaded-systems model that this approach can be improved significantly with pulsed coherent or squeezed driving of a spin-1/2 emitter. This enables the deterministic generation of strongly Wigne…

2. Very close Another approach to the problem Not relevant

   Non-Gaussian quantum state generation by multi-photon subtraction at the telecommunication wavelength

   Mamoru Endo, Ruofan He, Tatsuki Sonoyama et al. · 2023 · Optics Express 31, 12865-12879 (2023) · cited 41 times · AI summary available

   The experiment generates short telecom-band non-Gaussian states with negative Wigner values by subtracting up to three photons, rather than coherently controlling a quantum dot.

   Abstract

   In the field of continuous-variable quantum information processing, non-Gaussian states with negative values of the Wigner function are crucial for the development of a fault-tolerant universal quantum computer. While several non-Gaussian states have been generated experimentally, none have been created using ultrashort optical wave packets, which are necessary for high-speed quantum computation, in the telecommunication wavelength band where mature optical communication technology is available. In this paper, we present the generation of non-Gaussian states on wave packets with a short 8-ps duration in the 1545.32 nm telecommunication wavelength band using photon subtraction up to three pho…

3. Close Broader context Not relevant

   Widely tunable solid-state source of single-photons matching an atomic transition

   Rubayet Al Maruf, Sreesh Venuturumilli, Divya Bharadwaj et al. · 2023 · Quantum Physics · cited 7 times · AI summary available

   The study tunes quantum-dot single-photon emission to match an atomic transition for hybrid quantum technologies, rather than generating tunable Wigner-negative states.

   Abstract

   Hybrid quantum technologies aim to harness the best characteristics of multiple quantum systems, in a similar fashion that classical computers combine electronic, photonic, magnetic, and mechanical components. For example, quantum dots embedded in semiconductor nanowires can produce highly pure, deterministic, and indistinguishable single-photons with high repetition, while atomic ensembles offer robust photon storage capabilities and strong optical nonlinearities that can be controlled with single-photons. However, to successfully integrate quantum dots with atomic ensembles, one needs to carefully match the optical frequencies of these two platforms. Here, we propose and experimentally dem…

4. Close Same method, another problem Not relevant

   Single-Photon Nonlinearity from a Nanobeam with a Quantum Dot

   Abhijit Biswas, N. Vij, A. Bracker et al. · 2026 · cited 1 time · Not summarized yet

   The experiment uses a quantum dot coupled to a nanobeam cavity to demonstrate single-photon nonlinearity, the emitter mechanism used here to generate nonclassical light.

   Abstract

   An efficient single-photon nonlinearity is a key resource for photonic quantum technologies. Single-photon nonlinearities have been demonstrated with quantum dots (QDs) across a range of cavity and waveguide geometries. However, none of these realizations simultaneously provide high-efficiency direct fiber coupling and compatibility with scalable on-chip integration. The nanobeam cavity addresses these limitations through its in-plane geometry, which enables highly efficient, direct fiber coupling alongside scalable homogeneous and heterogeneous on-chip integration. Here, we report a single-photon nonlinearity from a nanobeam cavity coupled to a single quantum dot. The nanobeam interfaces di…

5. Close Same method, another problem Not relevant

   Coherent control and high purity single-photon emission from telecom quantum dots on metamorphic InGaAs

   Beatrice Costa, B. Scaparra, H. Riedl et al. · 2026 · Not summarized yet

   The study uses coherent excitation of InGaAs quantum dots to characterize high-purity single-photon emission, rather than generating vacuum–one-photon superpositions.

   Abstract

   Semiconductor quantum dots emitting in the telecommunication O- and C-bands are promising candidates as single-photon sources for fiber-based quantum communication. In this work, we show how coherent quasi-resonant and phonon-assisted excitation help reveal the intrinsic optical properties of InAs quantum dots embedded in relaxed InGaAs matrices on top of metamorphic InGaAs layers for achieving emission in the telecom bands. By systematically comparing excitation schemes, we separate excitation-induced effects from intrinsic emitter properties. This allows us to observe linewidths as narrow as 21 $\mu$eV, the disappearance of slow decay channels, and single-photon purity reaching second-orde…

6. Close Review Not relevant

   Semiconductor quantum dots for quantum science and technologies

   A. Rastelli · 2026 · Low-Dimensional Materials and Devices 2026 · Not summarized yet

   The review surveys GaAs quantum-dot emitters and their applications in quantum science, including sources of quantum light.

   Abstract

   Emerging photonic quantum technologies require the development of high-performance sources of quantum light. Among different platforms, self-assembled GaAs quantum dots (QDs) in AlGaAs have demonstrated excellent performance both as quantum emitters as well as hosts of electron and nuclear spins with long coherence times. The most established method to produce GaAs QDs relies on the Al-droplet etching epitaxy. Under optimized conditions, the QDs have high in-plane symmetry, good ensemble homogeneity, high oscillator strengths, and high optical quality, especially when embedded in charge-tunable diode structures. These properties make them particularly suited for the generation of polarizatio…

7. Close Same method, another problem Not relevant

   Single-photon controlled phase shifts with colloidal quantum dots at room temperature

   Chai Hu, Wen-Yi Dai, Yuan-Yuan Zhou et al. · 2026 · Science Advances · Not summarized yet

   The experiment uses a colloidal quantum dot coupled to a photonic-crystal microcavity to measure single-photon-controlled phase shifts.

   Abstract

   Quantum logic gates based on quantum electrodynamics (QED) in strong coupling regime between quantum dots and microcavities are key elements for scalable quantum computing and all-optical quantum networks. Here, a single colloidal quantum dot was site-selectively positioned onto a dielectric photonic crystal hybrid microcavity using a soft nanoprobe technique, enabling the study of strong coupling between the colloidal quantum dots and bound states in the continuum in the cavity. By combining photoluminescence spectroscopy, Michelson interferometry, and continuous-wave pump-probe technology, the wavelength- and power-dependent phase shifts were systematically characterized. Controlled π-phas…

8. Close Broader context Cited by this paper Used in depth by this paper Not relevant

   Industry-ready spin-photon interfaces for hybrid photonic quantum computing

   H. Huet, H. Lam, Thibaut Pollet et al. · 2026 · cited 5 times · Not summarized yet

   The review discusses cavity-coupled semiconductor quantum dots as spin–photon interfaces for hybrid photonic quantum computing.

   Abstract

   Hybrid photonic quantum computers, combining stationary matter qubits and flying photonic qubits, offer an intrinsically networked and resource-efficient route to large-scale, error-corrected quantum computation. Their core components are cavity-coupled matter qubits that act as light--matter interfaces, enabling: high-efficiency on-demand single-photon generation, stable near-unity photon indistinguishability and spin--multi-photon entanglement. Semiconductor quantum dots in microcavities are a leading platform for realizing such devices. Yet reaching the performance, reproducibility and spin-coherence thresholds for large-scale error correction remains a major challenge requiring industria…

Prior work it builds on

1. Related Review Not relevant

   Squeezed Light

   T. Rotter · 2019 · A Guide to Experiments in Quantum Optics · cited 105 times · Not summarized yet

   The overview surveys squeezed-light generation and applications, including optical processes relevant to quantum-state engineering.

   Abstract

   This paper gives an overview on squeezed light with an emphasis on its generation. Squeezing means, that the uctuation in one of two conjugate components (e.g. amplitude and phase) is suppressed while enhanced in the other. Consequently squeezing can be generated by phase sensitive processes. Such processes are known from nonlinear optics, e.g. second harmonic generation, parametric down{ and upconversion and four wave mixing, and they have been successfully used to generate squeezed light. Application of squeezed light is still rare because it is di cult to maintain the squeezed character.